Server :: Mdadm & Raid6: Does Re-create(with Different Chunk Size)+resync Destroy Orig. Data?
Oct 14, 2010I'm having issue with raid6. I already created a thread in the "Linux -General" forum, but it seems, there is no right audience
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Server :: MDADM RAID6 Active Despite 3 Drive Failures
Jul 26, 2011I 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.
Server :: Raid 1 - Resync The Drives In The Array Hda Primary And Hdc Secondary Using Mdadm?
Nov 30, 2010I am learning software raid 1 with centos 5.5. I created the raid with out any problems and removed the first drive to check there was no problems and it booted. I have installed the old drive back in the system as hdc and need to resync the drives (used old drive as partitions correct) I thought I could use raidhotadd but id does not seem to exist anymore. how I resync the drives in the array hda primary and hdc secondary using mdadm
View 1 Replies View RelatedGeneral :: RAID1 Resync Slow Using Mdadm?
Mar 11, 2010I am running Kernel 2.6.18-128.el5 on a 64bit quad core machine with 8GB RAM. Using "mdadm" I setup a RAID1 array between two Western Digital 1.5TB drives. The problem is that the resync is running VERY slow. Here is a current status.
[root@royalflush shared]# cat /proc/mdstat Personalities : [raid1]
md1 : active raid1 hdc5[1] hda5[0]
1304493952 blocks [2/2] [UU]
[=>] resync = 6.2% (81592192/1304493952) finish=4280156.0min speed=4K/sec
unused devices: <none>
General :: Mdadm - RAID5 To RAID6, Spare Won't Become Active
Jun 21, 2011I'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.
Ubuntu Servers :: 15K/sec Rebuild Speed On Mdadm RAID6 Array?
Jul 18, 2011Code:
$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!
Networking :: Serial Port : Not Able To Write Big Chunk Of Data?
Mar 10, 2010I am trying to send text data from one PC to other using Serial cable. One of the PC is running linux and I am sending data from it using write(2) system call. The log size is approx 65K bytes but the write(2) system call returns some 4K bytes (i.e. this much amount of data is getting transferred). I tried breaking the data in chunks of 4K but write(2) returns -1.My question is that "Is there any buffer limit for writing data on serial port? or can I send data of any size?. Also do I need to continously read data from other PC as I write 4K chunk of data"Do I need to do any special configuration in termios structure for sending (huge) data?
View 4 Replies View RelatedUbuntu :: Raid 1: Does It Destroy Data?
Jul 4, 2011my question is quite simple and at the same time should even sound weird for people that is used to use raids... but here we go! I have got 2 hard disks that do match in space. I'd like to use mdadm to create a raid 1, the mirror one. Since I don't want to format / erase / delete what's in my primary hard disk (/dev/sda, 3 partitions), how can I replicate its content into /dev/sdb and mirror it with the raid tool? Does something like this work?
- install madam
- fdisk /dev/sdb and replicate sda's partitions (using as filesystem "fd");
- sudo mdadm --create --verbose /dev/md0 --level=mirror --raid-devices=2 /dev/sda1 /dev/sdb1
- sudo mdadm --create --verbose /dev/md1 --level=mirror --raid-devices=2 /dev/sda2 /dev/sdb2
sudo mdadm --create --verbose /dev/md2 --level=mirror --raid-devices=2 /dev/sda3 /dev/sdb3
Do you have any page to point, with the right documentation to achieve a replication of the hard disk without a format of the source disk?
Applications :: Finding A Program To Destroy Data On DVDs
Feb 7, 2011What I want to do is force my DVD burner to use full writing power on the entire surface of a DVD. This should be able to invisibly damage the contained data, and should work on CDs, DVDs and BRDs too (in theory). I don't want to write data over it, so it's not a matter of having a RW disc or a R one. The result I want to obtain is simply an unreadable disc that does not look damaged. Do you know if there's a program able to ignore a disc being already full and perform this task?
View 2 Replies View RelatedServer :: Mdadm Create,, Raid Array Is Not Clean?
Nov 16, 2009mdadm --create /dev/md1 --level=1 --raid-disks=2 missing /dev/sdb1and I getmd1: raid array is not clean -- starting background reconstructionWhy is it not clean?Should I be worried?The HD is not new it has been used in before in a raid array but has beenrepartitionated.
View 2 Replies View RelatedSUSE / Novell :: Program To Completely Destroy All Data In Free Space On Hard Drive?
Aug 10, 2010I dont want to wipe the whole drive, and i don't want to delete only particular files. I want to completely destroy all data in free space.I've found some articles about secure-delete package for linux that would allow erasing freespace with the command 'sfill,' but I can't find it in the repositories nor through google. This would be ideal but it seems maybe it's debian only.
View 2 Replies View RelatedUbuntu :: Machine And 'tried' To Create A 4 Disk RAID6 Array On Four New 4TB Drives?
May 30, 2010I installed 10.04 on a new machine and 'tried' to create a 4 disk RAID6 array on four new 4TB drives.The build seemed to go fine, but a check on the new dev shows the following:
/dev/md0:
Version : 00.90
Creation Time : Sun May 30 21:53:11 2010
[code]....
Server :: Increasing HDD Size While Keeping Data Intact
Jun 15, 2010I'm currently setting up a server with 2x 1TB disks in raid1. (Centos 5.5)In the future, if the storage is insufficient and I decide to upgrade the disks to 2x 2TB, could I just:
- dump ghost image of the array on usb drive
- replace hdd's and build new array
- ghost array with image created previously
Would the above work, will the new partition automatically resize to 2TB or do I need to partition right now with LVM? would it work with LVM?
Server :: Having Slow RAID 1 Resync?
Aug 1, 2010I have ClearOS (CentOS) installed. I have 2 x 2TB SATA HDDs (hda & hdc). At installation time, I configured a RAID 1 (and LVM) between the two HDDs. After a power problem happened, the two HDD were re-syncing and I checked it using: watch cat /proc/mdstat The speed didn't exceed 2100 KB/s I tried the following with no change:
echo 50000 > /proc/sys/dev/raid/speed_limit_min
Red Hat :: Hard Disk Partition Size To Create Name Server
Jan 24, 2011I want to configure Name Server i.e., DNS to my red hat linux box in a production enviromnt.The ram is 2 GB and Hard Disk size is 200 GB. How much space should I give /var, /usr, /boot, /root and home partition. May be I am wrong in partition point of view while installing fresh red hat but to install for home purpose and server end is different. So kindly guide me the hard disk partition size to ready it for name server.
View 3 Replies View RelatedServer :: Ubuntu 10.04 Server With Raid6 And Possibility Of Motherboard Failure?
Oct 6, 2010I 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.
Server :: Weekly Once Resync Is Starting Itself In RAID1
Jul 25, 2011how can I stop resyncing permenently & how can I check whether the normal sata HDDs can support RAID before/after buying HDDs. Because on every saturday or sunday resync is starting itself even there is no entry about resncing in crontab. But if I run "cat /proc/mdstat" it is showing RAID1 is perfect. see the below output
#cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hdb1[1] hda1[0]
513984 blocks [2/2] [UU]
[code]....
Debian Configuration :: Raid 5 With Mdadm Not Showing Complete Size?
Mar 13, 2010I just expanded my raid 5 array from 3*2TB to 4*2TB and mdadm made the grow successfully and shows an md0 dev with the size of 6TB usable data. Now my problem is that Debian (Lenny) dosnīt show the right amount. See below
######### MDADM DETAILS OF ARRAY ##########
> mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Mon Dec 14 22:30:46 2009
Raid Level : raid5
[Code].....
Server :: Raid6 - How To Extend Volume Group
May 16, 2010I'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.
View 6 Replies View RelatedDebian :: Mdadm Create A Backup File After Grow Command
Feb 27, 2016I launch a mdadm grow to expand my filesystem but I forget --backup-file.I have my server running and one UPS.
Code: Select allpk25.com:~# mdadm --manage /dev/md0 --add /dev/sde1
mdadm: added /dev/sde1
pk25.com:~# mdadm --grow --raid-devices=5 /dev/md0
mdadm: Need to backup 3072K of critical section..
pk25.com:~# mdadm --grow --raid-devices=5 --backup-file=/root/md0-grow.bak /dev/md0
mdadm: /dev/md0 is performing resync/recovery and cannot be reshaped
[code]....
Ubuntu Servers :: Create A New Mdadm RAID 5 Device /dev/md0 Across Three Disks?
Feb 5, 2011I am trying to create a new mdadm RAID 5 device /dev/md0 across three disks where such an array previously existed, but whenever I do it never recovers properly and tells me that I have a faulty spare in my array. More-specific details below. I recently installed Ubuntu Server 10.10 on a new box with the intent of using it as a NAS sorta-thing. I have 3 HDDs (2 TB each) and was hoping to use most of the available disk space as a RAID5 mdadm device (which gives me a bit less than 4TB.)
I configured /dev/md0 during OS installation across three partitions on the three disks - /dev/sda5, /dev/sdb5 and /dev/sdc5, which are all identical sizes. The OS, swap partition etc. are all on /dev/sda. Everything worked fine, and I was able to format the device as ext4 and mount it. Good so far.
Then I thought I should simulate a failure before I started keeping important stuff on the RAID array - no point having RAID 5 if it doesn't provide some redundancy that I actually know how to use, right? So I unplugged one of my drives, booted up, and was able to mount the device in a degraded state; test data I had put on there was still fine. Great. My trouble began when I plugged the third drive back in and re-booted. I re-added the removed drive to /dev/md0 and recovery began; things would look something like this:
Code:
user@guybrush:~$ cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sdc5[3] sdb5[1] sda5[0]
3779096448 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_]
[Code]...
Ubuntu Installation :: Can Create An Mdadm RAID0 Array When Fakeraid Is Enabled
May 24, 2011I'm looking to shrink my windows partition on a raid0 array and create a mdadm ubuntu partition using raid0. Is this possible? can I just ignore the /dev/mapper device and use the standard /dev/sdx devices?
View 4 Replies View RelatedSlackware :: Delete All .orig Config Files After Slackpkg Update Process?
Dec 8, 2010How do I delete all the .orig config files after I go throught the following process?
slackpkg update
slackpkg install-new
slackpkg upgrade-all
Programming :: [C] Parsing Lines Into Chunks And Writing Each Chunk?
Sep 10, 2010My C foo is terrible! I am working with some code which reads lines from a file and then reformats the lines and writes them to a new file.The input lines look like this:
Code:
+[NEOTEST?]
+[NEOTEST]
[code]...
Fedora :: MDADM On 12 64bit - Error "mdadm: Cannot Add Disks To A 'member' Array, Perform This Operation On The Parent Container"
Nov 22, 2009Here'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)
Ubuntu / Apple :: Data Size Too Large For Disk?
Apr 28, 2011I am trying to burn mac osx 10.5 install disk from from a 6.7gb dmg disk image. I thought I would be using 2 DVD-R 4.7GB discsfor this burn, I was hoping when the first was full it would ask for another to finish the burn. Instead it get the message that the DVD will not hold the choosen DMG. file.
Can I do anything besides buy a dual layer DVD that would hold the whole file?
Server :: Can't Assemble RAID5 With Mdadm
Jun 14, 2011I 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.
Server :: Configure Mdadm W/ Hotspare?
Mar 11, 2010I 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]....
Server :: Mdadm Cannot Grow Raid1 Over Lvm?
Mar 31, 2011I'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]...
General :: Change Size Of Network Data Receiving Buffer On OS?
Jan 21, 2010We know that, in a network, data transfer time is dependent on capacity of the receiving node. I have two Linux systems A (sender) and B (receiver) connected. I want to simulate congetion in a network, that means I want to increse the time taken to transfer some data. I believe, I can do this if I can reduce the capacity of the receiver node B. That perhaps possible by decreasing the receiving buffer size of B. How can I change the receiving buffer size of this linux system B?
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