Server :: MDADM RAID6 Active Despite 3 Drive Failures
Jul 26, 2011
I am currently having problems with my RAID partition. First two disks were having trouble (sde, sdf). Through smartctl I noticed there were some bad blocks, so first I set them to fail, and readded them so that the RAID array will overwrite these. Since that didn't work, I went ahead and replaced the disks. The recovery process was slow and I left things running overnight. This morning I find out that another disk (sdb) has failed. Strangely enough the array has not become inactive.
md3 : active raid6 sdf1[15](S) sde1[16](S) sdak1[10] sdj1[8] sdk1[9] sdb1[17](F) sdan1[13] sdd1[2] sdc1[1] sdg1[5] sdi1[7] sdal1[11] sdam1[12] sdao1[14] sdh1[6]
25395655168 blocks level 6, 64k chunk, algorithm 2 [15/12] [_UU__UUUUUUUUUU]
Does anyone have any recommendations as the steps to take ahead with regards to recovery/fixing the problem? The disk is basically full so I haven't written anything to disk in the interim of this problem.
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Jun 21, 2011
I've been playing with this for hours, and have been unable to figure it out. I tried to convert my RAID5 array of 4 active disks and 1 spare to a RAID6 with 5 active disks.
I did this:
Code:
mdadm --grow /dev/md4 --raid-devices 5 --level 6
Here is what I have on /dev/md4:
Code:
/dev/sde1 active
/dev/sdg1 active
/dev/sdj1 active
/dev/sdf1 active
removed
/dev/sdh5 spare
code....
but it tells me that /dev/sde is busy, and then that it has a bad superblock (From what I've read, I'm sure the bad superblock is just because of the "busy" message). I've tried this with the -f option, too, with no luck.
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Oct 14, 2010
I'm having issue with raid6. I already created a thread in the "Linux -General" forum, but it seems, there is no right audience
[URL]
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Jul 18, 2011
Code:
$cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
[code]....
1/4 of my drives died after about 3 years of usage. I replaced it with an identical drive and did a mdadm -add to re-add it to the array. I expected this to take quite a long time, but not more than 1 million minutes to complete!
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Jun 19, 2010
I currently have a Raid0 setup with two disks and I have no problems whatsover. I currently bought 3 brand new 1B drives and I set up Raid5. I created the array and everything works fine. I formatted the array and mounted it. When I tried to copy 750gb of data over my new array, it copies fine at some point and it fails. After reboot, I am seeing the array inactive. I tried everything and could not get the raid back active status. I have removed the array and recreated again, formatted again. When I started copying my files over, exactly same thing happened.
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May 28, 2010
Server with 4 disk partitions in an RAID 5 array using md. Yesterday the array failed with two devices showing as faulty. After rebooting from rescue, I was able to force the assembly and start the array and everything looks to be okay as far as the data goes, but when I run:
Code:
mdadm --examine /dev/sda3
I get (truncating to the interesting bits):
Code:
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 1448195216 (690.55 GiB 741.48 GB)
Array Size : 4344585216 (2071.66 GiB 2224.43 GB)
Used Dev Size : 1448195072 (690.55 GiB 741.48 GB)
Array Slot : 0 (0, 1, 2, failed, 3)
Array State : Uuuu 1 failed
And
Code:
mdadm --detail /dev/md1
yields:
Code:
Array Size : 2172292608 (2071.66 GiB 2224.43 GB)
Used Dev Size : 1448195072 (1381.11 GiB 1482.95 GB)
Raid Devices : 4
Total Devices : 4
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Additionally, the 'slot' for devices a-d line up like this:
a - 0
b - 1
c - 2
d - 4 (!)
The first number 'Array Size' from examine is twice as big as sit should be based on the output from detail and comparing to twinned server, and why does the 'Array State' and 'Array Slot' from examine indicate there's a 5th device that's not indicated anywhere else?
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Jun 7, 2011
I have 4 WD10EARS drives running in a RAID 5 array using MDADM.Yesterday my OS Drive failed. I have replaced this and installed a fresh copy of Ubuntu 11.04 on it. then installed MDADM, and rebooted the machine, hoping that it would automatically rebuild the array.It hasnt, when i look at the array using Disk Utility, it says that the array is not running. If i try to start the array it says :Error assembling array: mdadm exited with exit code 1: mdadm: failed to RUN_ARRAY /dev/md0: Input/output error
mdadm: Not enough devices to start the array.I have tried MDADM --assemble --scan and it gives this output:mdadm: /dev/md0 assembled from 2 drives - not enough to start the array.I know that there are 4 drives present as they are all showing, but it is only using 2 of them.I also ran MDADM -- detail /dev.md0 which gave:
root@warren-P5K-E:~# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
[code]...
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Jul 27, 2011
I have a raid 5 array that appears to have died. I was just routinely looking at /var/log/messages and noticed that a drive in the array was complaining (via SMARTD).
This is the /home directory, and so is backed up, so it's not critical, but I'd like to get some things that changed after the last backup (the week before I noticed the failure)
Let me start by outlining what I know :
It's a 2TB array spread over three disks (mdadm software RAID5), here are the drives:
MDADM gives the drives :
Now, the array *WAS* up ok, but I umounted it. (in which /dev/md0 was mounted to /home) Yes,I know - I didn't want any changes being made to the array by anything - at least that was my thinking at the time. In hindsight... I would have killed any processes, locked out the server, backed up again and 'then' unmounted it.
But we are where we are, I'm sure there'll be time for recriminations later.
When I try to remount it, I get :
Ok - looks like it's lost the type - it's normally worked, maybe we'll give it a little hint - it's ext3 with a journal.
When I tell it it's an ext3, I get :
Now, before I go charging off specifying superblocks further along the disk, but I can't remember where they're stored.
Neither can I recall what the blocksize I originally created the array as (I have a feeling I specifed 4K, but I could be wrong).
debugfs is only telling me :
I should also point out that this server is hosted, so it's 150 miles away from me at the moment, so I can't just whip them out and dd a copy.
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Aug 7, 2011
I'm convinced that mdadm is going to be the death of me. I've wasted numerous hours on this so far without luck.
OpenSuse 11.4 on an old Supermicro box, creating a software RAID1 array across 2 x IDE 500GB disks. Creating /dev/md0 as a 250MB partition across /dev/sda1 and /dev/sdd1 for /boot, another 465GB partition across /dev/sda2 and /dev/sdd2 as an LVM partition to hold volumes for the various other OS filesystems. After the initial installation and configuration there were a series of mishaps with faulty IDE cables that had drives failing to show up at boot. Somehow, /dev/sdd2 got configured to array /dev/md1 as a spare drive. And nothing I've done so far gets it to show up as an active drive.
The obvious step of failing the partition, removing it, then adding (or re-adding) will bring it back as a spare. I've tried roughly a dozen different permutations of those same steps. The latest was to 'dd if=/dev/zero of=/dev/sdd2' to clear the partition. Thought this might be the trick - after the zero, mdadm -E /dev/sdd2 reported 'no superblock' and no md1 configuration.
So 'mdadm --add /dev/md1 /dev/sdd2' and it still comes back as a spare. Here is mdadm -D /dev/md1
/dev/md1:
Version : 1.0
Creation Time : Sat Jul 9 10:26:01 2011
Raid Level : raid1
Array Size : 488119160 (465.51 GiB 499.83 GB)
code....
I can't stop this array, the OS is running from there. I can't easily boot from CD to repair, all IDE ports have disks attached.
Does anyone have an incantation to promote a spare to active?
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Oct 3, 2010
I'm using a RHEL5/Centos5 variant. After struggling with various 2 TB hard drive failures, I started using the Hitachi Deskstar and Ultrastar models, and had none of the earlier green feature related or QA problems I had with all others. However, I began seeing SATA controller freezing under heavy loads, like large rsync mirror operations. My controller is an on-board ICH7R running in AHCI mode. The symptoms are that the drive goes off line and begins to log thousands of SMART errors for Spin-Up Retries. Analysis confirms that the drive is 100% OK after, except for the huge SMART log. This happens on two servers, and multiple drives. Changing the drive to 1.5 Gbps interface speed reduces the problem greatly but does not eliminate it.
I'm working with Hitachi engineering on this, and their only theory is that it has to do with "non-zero buffer offset". Apparently this is a feature of NCQ to receive data out of sequence, and Hitachi says that ICH7R is supports NCQ but not this feature. I am told that BIOS is supposed to filter offending commands but BIOS vendors sometimes err. An alternate is to filter them at the driver, which I believe is libata. Does anyone know anything about this issue? Where might be a good place to make a query about this, with regards to libata? I've contacted the motherboard vendor about the BIOS issue, but I'd like to look into libata also.
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Oct 6, 2010
I have set up a server box running Ubuntu 10.04 Server 64-bit with Squeezeboxserver, ftp, apache and all the things that I need.I am running it on a Asus P5Q pro with 9 harddrives attached.I have set up 6 1tb disks that run a raid6 array but I am wondering what would happen if the motherboard would fail me.Is it possible to just replace the motherboard with a newer one and would then the raid6 array still be intact?
I used to run a raid10 with the 6 disks on a Windows 7 machine with a software raid card but the card broke and I replaced it with a new one but the array could would not work so I had to forget all my data and this is what brought me to using a Ubuntu server as OS and running the raid array on the motherboard sata instead.Also, is it possible to make an exact copy of the boot drive/partition and easily replace that is the boot hard drive would go faulty? I have heard about the dd command and I feel it would be nice to know that I'm not totally screwed if the boot drive fails.
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May 16, 2010
I'm running debian and used mdadm to setup up a raid 6 array with 4x1TB drives with roughly 1.86TB's available with lvm. Then I added 4x1TB drives to the array. So now I have an 8 drive raid 6 array with 5.+TB's available, the array sees all available space. The question is how do I extend the volume group so that it uses the whole raid and not just half of it. As of right now the volume group is only 1.86TB's.
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Aug 4, 2010
I need to scrape logfiles and do some pattern matching for a series of hardware and system faults;
For example:
Network interface down / up
IO errors
Out of Inodes
Out of Diskspace
Memory Errors
Power Failure
When the appropriate Strings appear in the log (assuming /var/logs/messages)Then a trap will be sent. (Customer specific SNMP solution) So what I need (I think) is a list of the strings I need to match.Has anybody any idea where I can find a list of strings which will definitely appear in the log - RHEL5 ?
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Apr 22, 2010
I need by searching this site so I haven't had a need to sign up since I can't really help anyone as of yet. With that said here is my problem: I'm running a VPS with CentOS RHEL 5 host-in-a-box, I just did a rebuild of the server and after a day or two pure-ftpd and sshd unexpectedly close out any incoming connections. I am the only one that uses ssh and ftp so I'm not sure what the problem could be. I checked the logs and there is nothing to do with not being able to bind on the address.
I tried connecting through ssh in verbose mode and it connects to the server just fine, but drops the connection before it asks me for my key pass phrase. If I enable password access it will drop before it asks me for it's password. I've tried restarting sshd and ftpd. I've tried rebooting the machine. I've tried google, but this problem seems to need a little more specific trouble shooting. I can get in through console access, but that doesn't help me much when I need to transfer files.
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Dec 14, 2009
I am setting up a cluster of servers which use Centos Directory Server for control of logins, etc and kerberos for authentication. The basic setup is working fine, I have been able to manually create accounts using the directory console and these accounts seem to work. Now what I want to do is automate the process of creating new accounts. I am writing a perl script which can be run by one of the server administrators, they supply a small number of arguments and it should create a new user in the directory server, and also create a principal in the kerberos.
I want them to be able to do this using their logged-in kerberos credentials, i.e., without having to enter and re-enter their passwords. My first attempt was to use perl modules Net::LDAP and Authen::SASL. I could not get this working so fell back to using ldap command line tools, but even these I cannot seem to get working! When using mozldap tools, as specified in the admin manual, I get the following:
$ /usr/lib64/mozldap/ldapmodify -h ldaphost.mycompany.com -D uid=eharmic,ou=mydept,dc=mycompany -o mech=GSSAPI -o authid=eharmic < ../ldapmod.txt
Bind Error: Invalid credentials
Bind Error: additional info: SASL(-14): authorization failure:
Using openldap tools I strike exactly the same problem:
$ ldapmodify -Y GSSAPI -H LDAP://ldaphost.mycompany.com -D uid=eharmic,ou=mydept,dc=mycompany -U eharmic < ../ldapmod.txt
SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Invalid credentials (49)
additional info: SASL(-14): authorization failure:
I believe I have set up the mapping correctly:
dn: cn=MyMapping,cn=mapping,cn=sasl,cn=config
objectClass: top
objectClass: nsSaslMapping
cn: MyMapping
nsSaslMapRegexString: ^(.+)@MYCOMPANY.COM
nsSaslMapBaseDNTemplate: ou=mydept,dc=mycompany
nsSaslMapFilterTemplate: (uid=1)
It must be getting reasonably far because after doing the above I can see the LDAP service ticket in my "klist" output.
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Aug 7, 2011
I know this is probably a very generic linux question, but since I am using ubuntu - I thought it safer to ask here. I have jumped into the deep end of linux - and I am afraid that I will be forced to swim sooner rather than later.
Let me start at the beginning - I am and probably will be a windows fan for a long time - let me not list the reasons - or else you guys will probably hang met out to dry - the one thing I have discovered - is that windows sucks in generating a software RAID - especially the RAID 5 that i was looking for any case - after loosing plenty data via windose - I decided to attempt linux/ ubuntu. I must say - so far so good.
I used this excellent guide: [URL] and must say that the raid is performing admirably - I am currently busy adding/growing the 12th 1Tb drive onto the RAID, and no issues so far(some other major WOW advantages i have noticed... like speed writing too and reading from the RAID.. )
See below MDstat outputcat proc mdstat:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdl1[11] sdj1[10] sdb1[1] sdm1[6] sdk1[2] sdi1[8] sdh1[0] sdg1[3] sdf1[4] sde1[9] sdd1[5] sdc1[7]
9767599360 blocks super 0.91 level 5, 64k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU]
[==========>..........] reshape = 50.7% (495864576/976759936) finish=1482.0min speed=5407K/sec
unused devices: <none>
My questions :
If one drive fails on the array(for example SDK1) - how the heck do i determine which physical hardware device it is that has failed? (without compromising the other data - yes unfortunately I cant afford to backup 11TB of data - personal server). I don't have space in the box for a mouse - not even talking about a hot spare drive - thus adding the backup drive before removing the faulty drive is rather difficult - but if that's the only option I will have to keep with that as everybody know RAID5 is only 1 drive backup - so partly I would like to solve the issue as quick as possible -without having to resort to disconnecting one drive at a time to determine which is which. If the drive assignments ( SDA/SDB/SDC) is constant
What is the most intuitive/fast way to determine that a faulty drive exist in the array? - i.e. is there some sort of GUI solution for MDADM that will tell me the moment that a drive has turned faulty? - The box is currently not on the internet -meaning notification via email is not possible. Is there a non-destructible way to convert the RAID-5 to RAID-6? (I would rather sacrifice 1TB of free space - for peace of mind) - and RAID6 will make troubleshooting a bit easier since 3 drives will have to fail before data-loss.
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Jan 17, 2010
i am setting up a software raid6 for the first time. To test the raid i removed a drive from the array by popping it out of the enclosure. mdadm marked the drive as F and everything seemed well. From what i gather the next step is to remove the drive from the array (mdadm /dev/md0 -r sdf), when i try this i receive the error:
mdadm: cannot find /dev/sdf: No such file or directory
That is true, when i plugged the drive back in the machine now recognizes it as /dev/sdk. My question is how do i remove this non-existent failed drive from my array as i was able to re-add it just fine as /dev/sdk with mdadm /dev/md0 -a /dev/sdk
Also, is there any way to define a drive based on id or something similar to the same drive name to avoid this?
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdk[9] sdj[8] sdi[7] sdh[6] sdg[5] sdf[10](F) sde[3] sdd[2] sdc[1] sdb[0]
13674601472 blocks level 6, 64k chunk, algorithm 2 [9/8] [UUUU_UUUU]
[>....................] recovery = 2.7% (54654548/1953514496) finish=399.9min speed=79132K/sec
[Code].....
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Dec 3, 2010
I have 4 SATA's in a RAID 5 array using mdadm. Yesterday when I started the computer the RAID did not build/mount. When trying to load the array manually I get the message "mdadm: cannot open device /dev/sd(a,b,c,d)1: Device or resource busy" The drives should not be mounted or in use. The output of the drives in mdadm (mdadm --examine /dev/sd_1) looks normal.
The weirdest part is that rebooting often changes which drive is marked as busy, it can be any of the 4 SATA drives. how to figure out why/what is being used and how to disable it? I have tried searching for similar threads here and in google and haven't found anything similar or that worked.
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May 18, 2011
I have an mdadm linear array of 4 500GB drives. One of them had a few bad sectors, so I've dd'ed it to a new one (conv=noerror), and tried to start my array. Mdadm refuses, saying, "mdadm: /dev/md4 assembled from 3 drives - not enough to start the array."I had diffed different samples from different positions on the source and the mirror drive and confirmed they were identical. Checking the superblocks confirms three old drives still having their superblocks as expected, while the newly mirrored one has,
daniel@lnxsrv:~$ sudo mdadm --misc --examine /dev/sdf1
mdadm: No md superblock detected on /dev/sdf1.
- and,
daniel@lnxsrv:~$ sudo blkid /dev/sdf1
[code]....
As before. The mirror apparently has no uuid, but the original does. To confirm my sanity, I did,
daniel@lnxsrv:~$ sudo dd bs=1M count=50 if=/dev/sdc of=./sdc && sudo dd bs=1M count=50 if=/dev/sdd of=./sdd && sudo diff -s sdc sdd
50+0 records in
[code]...
How can the uuid not be the same when bit-for-bit from the very first byte of the drive, covering MFT etc., these two drives are identical according to diff?
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Dec 3, 2010
I have 4 SATA's in a RAID 5 array using mdadm. Yesterday when I started the computer the RAID did not build/mount.
When trying to load the array manually I get the message "mdadm: cannot open device /dev/sd(a,b,c,d)1: Device or resource busy" The drives should not be mounted or in use.
The output of the affected drive in mdadm (mdadm --examine /dev/sd_1) looks normal.
The weirdest part is that rebooting often changes which drive is marked as busy, it can be any of the 4 SATA drives. What is being used and how to disable it?
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May 19, 2010
I have 4 drives in my system. Two are SATA and configured in a RAID 1. This is my main drive for the system. The other two drives are IDE drives used to bulk temp storage. Before the upgrade my RAID drives were:
/dev/sda
/dev/sdb
I'm not sure what the IDE drives were. Now after the upgrade the IDE drives are:
/dev/sda
/dev/sdb
and the RAID SATA drives are:
/dev/sdc
/dev/sdd
Needless to say on reboot the raid blow up and the system would not boot. I was able to get it working for now by removing the IDE drives. My current mdadm.conf file is as follows:
DEVICE partitions
ARRAY /dev/md1 level=raid1 num-devices=3 UUID=20fd5b92:860d9ca3:57d3b65c:14fcf2fb
devices=/dev/sda2,/dev/sdb2
ARRAY /dev/md0 level=raid1 num-devices=3 UUID=16401201:52cf4cc0:27286d7a:ac5234f7
devices=/dev/sda1,/dev/sdb1
MAILADDR root
Now I assume that I could change the devices to the new devices names. However I was hoping for a better way to do this. The IDE drives are only semi permanent. Is there a way to configure mdadm with partition labels like you can in fstab?
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Jun 27, 2009
I have a used but good harddrive which I'd like to use as a replacement for a removed harddrive in existing raid1 array. mdadm --detail /dev/md00 0 0 -1 removed1 8 17 1 active sync /dev/sdb1I thought I needed to mark the removed drive as failed but I cannot get mdadm set it to "failed". I issue mdadm --manage /dev/md0 --fail /dev/sda1But mdadm response is:mdadm: hot remove failed for /dev/sda1: no such device or addressI thought I must mark the failed drive as "failed" to prevent raid1 from trying to mirror in wrong direction when I install my used-but-good disk. I want to reformat the good used drive first right? I believe I must prevent raid array from automatically try to mirror in the wrong direction.
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Nov 22, 2009
Here's a brief description of my system:
120GB Sata HDD - Primary OS drive
3 x 1.0TB Sata HDD - Raid 5 array
This is on a C2D MSI P35 Platinum board. Anyway, did a fresh install of F12 on the 120GB, which I had problems with - Anaconda refused to see the drive. Fedora Live could see it fine, and it was listed as an 'nvidia_raid_member' - no idea why, but I completely erased the disc under the Live CD and proceeded to install F12.
Once F12 was installed, I loaded up mdadm to re-activate my Raid 5 array, using 'sudo mdadm --assemble --uuidthe uuid) - and it started with only 2 of the 3 drives. My /dev/sdb drive did not activate into the array, due to what mdadm said was a mismatched UUID. Ok, so I erased /dev/sdb, intending to rebuild the array. Erased /dev/sdb, and then attempted 'sudo mdadm --add /dev/md0 /dev/sdb' and I get this error: "mdadm: Cannot add disks to a 'member' array, perform this operation on the parent container" - I can find NO information on this error message.
[Code].....
I don't believe the hard drives are connected in the exact same order they were in before - I disconnected everything in the system and blew it out (it was pretty dusty)
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Jun 14, 2011
I cant seem to get my RAID 5 (consisting of 8 1tb hard drives) assembled for some reason and I have no idea why and cant find any solutions online. Ill go ahead and show what my problem is:
here is all my hard drives:
Code:
server:~$ sudo fdisk -l
Disk /dev/sda: 10.2 GB, 10242892800 bytes
255 heads, 63 sectors/track, 1245 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0004f041
[Code]....
So as you can see the array for those last four look fine however for the first four it marks the last four drives as faulty for some reason. I am kind of clueless to do from this point on honestly, I have data on this array that I'd really like to save.
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Mar 11, 2010
I have a machine that supports 4 S-ATA drives. I have all identical drives in each slot. I am asking for someone to please tell me how I can create a RAID5 array on Linux and then also have the 4th drive (/dev/sdd) as a hot spare for any of the three drives in the array / volume?I did the following:
/device = type @ parition size
/dev/sda1 = fd @ 100 MB (bootable for /boot)
/dev/sda2 = fd @ 1 GB (Going to be used for Swap)
[code]....
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Mar 31, 2011
I've 2 servers (xen1 and xen2 - their hostnames) with perversion configuration below: Each server have 4 SATA disks, 1 Tb each.
16 Gb ddr3
debian squeeze x64 installed:
root@xen2:~# uname -a
Linux xen2 2.6.32-5-xen-amd64 #1 SMP Wed Jan 12 05:46:49 UTC 2011 x86_64 GNU/Linux
Storage configuration: Former 256 Mb + 32 Gb of 2 of 4 disks are used as raid1 devices for /boot and swap respectively. The rest of space, 970 Gb on all 4 sata disks are used as raid10. There is LVM2 installed over that raid10. Volume group is named xenlvm (that servers are expected to use as xen 4.0.1 hosts, but the story is not about Xen troubles). / , /var, /home are located on logical volumes of small size (just found out I got mixed up with lv names and partitions, but that's not the problem, I think):
[Code]...
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Jan 13, 2011
I have a little nice Ubuntu server with 6x 1TB drives assebmbled into a RAID5 array. Recently SATA cable of one of the drives failed. So I ordered a new cable and ran the server in degraded mode for a few days. Like this:
Code:
/dev/md0:
Version : 00.90
Creation Time : Sat Sep 19 10:39:11 2009
Raid Level : raid5
Array Size : 4883812480 (4657.57 GiB 5001.02 GB)
code....
I'd like the 6th drive to be active, not spare, like before. Should I just wait for rebuild to be finished (it can easily take over 1 day)? Or should I add it somehow differently to be active immediately?
I'm not sure, but I think as I simulated failures unplugging one of the disk, after plugging it in again, the "failed" drive was active again and rebuilding was started as well of course. But it was 2 years ago, so...
The array works just fine for now - I can access files, etc. But I suspect, that in this state if another cable or drive fails, it won't survive anymore. Even after rebuilding is finished, but the 6th drive stays is still marked as "spare". Right?
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May 13, 2010
I'm performing some experiments on a box with 5x36,4G disks. Right now I have partitioned all the drives in chunks of 1G, and put them together 3 by 3 in raid5. (Yeah, there's a lot of md-devices..). 'mdadm --query' and 'mdadm --detail' give summary/detailed information about the md's, on condition that I specify the device.
My question is if there would be a way to have a summary overview of all the md-devices at once. I've gone through the manual, but haven't found anything which resembles a useful command.
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Feb 20, 2011
My only goal is to have a raid-5 that auto-assembles and auto-mounts. Hardware: 4*2TB sata (raid disks), 1*500GB IDE (OS disk), 1*DVD IDE all plugged direct into the motherboard (nForce 750i SLI).
Starting partitions on the raid disks: gpt ext4 The problem occurs when I restart my comp after building it for the first time. I am able to see it assemble, I am able to partition it, I even mounted it Once.This is the second time I've built it so I have watched everything that happened. I don't know if this has anything to do with my problem, but when I created the raid my drive designations were: sda - 500GB(OS), sd[bcde] - 2TB(raid). When I restarted: sd[abcd] - 2TB(raid), sde - 500GB(OS).
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Feb 1, 2011
My home-backup server, with 8*2TB disks won't boot anymore. Two disks failed at the same time and i rebuilt the raid 6 array without any problem, but now i can't boot the os. I'm using ubuntu server, 10.10. I've made screens of the displays to don't copy everything here. The problem at the boot:
And the Grub config: It's not a production server, but i would like to have it online. I've tried for the lasts 2 days (just a couple hours a day) but without success. I was suggested to do "mount -o remount,rw /" and than edit /etc/fstab, but it get the file don't exist error.
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