CentOS 5 Hardware :: Put Drives On 9500S / Will It Recognize Existing RAID Array?
Sep 23, 2011
I have a home samba server with a 3ware Escalade 8506-8. I have 5 x 500 gig hard drives in a RAID 5 array. Recently, my 8506 died and I need to get a new one. However, I saw a 3ware Escalade 9500S-12 on ebay for about $20.00 dollars more than a replacement 8506-8.
My question is, if I put my drives on the 9500S, will it recognize my existing RAID array? Or will it want to build a new RAID array and format all of my data?Hope I have asked this question clearly, little short on sleep this week.
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Aug 1, 2011
I'm running 10.04 x86 server with a really simple installation on a single 250GB boot disk. I then have a RAID5 array as /dev/md0 (set up using mdadm with x4 2TB disks). All is working well. My mdadm.conf file looks like this
Code:
# mdadm.conf
#
# Please refer to mdadm.conf(5) for information about this file.
[code]....
if I was to lose the boot disk and need to remount the RAID array on a fresh installation, what steps do I need to go through. My assumption is that the superblocks on the RAID disks will be used and I don't need to keep any additional information - is this right?
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Mar 17, 2010
I want to make a RAID5 array with 4 2TB hard drives. One of the drives is full of data so I will need to start with a 3 disks and then once I copy the data from the 4th onto the array, I will then add the 4th drive. This will be my first experience with RAID. I've spent a few hours searching for info but most of what I have found is a bit over my head.
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May 11, 2011
I got my system up and running with the Grub installed on my primary hard drive. I have not installed 2 additional drives. I would like to combine the 2 additional drives into a RAID 1 array. I can only find tutorials on how to do this during initial install. I cannot find one that tell me how to do it after the install. Is there a way?
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Jun 15, 2011
I am trying to use 3 3TB Western Digital drives in a raid 5 software array. The trouble seems to be that the array is created with only 1.5 TB of capacity, rather then the expected 6 TB.
Here are the commands and output:
$ sudo dmraid -f isw -C BackupFull6 --type 5 --disk /dev/sde,/dev/sdf,/dev/sdg --size=5589G
Create a RAID set with ISW metadata format
RAID name: BackupFull6
RAID type: RAID5
RAID size: 5589G (11720982528 blocks)
RAID strip: 64k (128 blocks)
DISKS: /dev/sde, /dev/sdf, /dev/sdg
About to create a RAID set with the above settings. Continue ? [y/n] :y
$ sudo dmraid -s
*** Group superset isw_cdjhcaegij
--> Subset
name: isw_cdjhcaegij_BackupFull6
size : 3131048448
stride : 128
type : raid5_la
status : ok
subsets: 0
devs : 3
spares : 0
So I cannot understand why the size of the created array is only 3131048448 or about 1.5 TB. The first command seemed to imply it was going to create an array with 5589GB.
System is:
Description: Ubuntu 10.04.2 LTS
Release: 10.04
Codename: lucid
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Feb 23, 2010
I'm renting a dedicated server with a company that claims that the server has 2 hard drives in a software RAID 1 array, but I need to make sure that the server really has the 2 HDD, and the size of the 2nd drive... how to do that ?? system is Centos 5.3
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Apr 24, 2011
Its from a Synology Box with 3 disks, which one is damaged. But this disk wasnt in use.Take a look on the raid-size of 493 GB - and the both available disks with 250GB..)
On the others there were a linear raid. during this damaged disk the synology-device tells me, that the volume was crashed.But it look like, that this disk was not mounted into this volume.Quote:
DiskStation> mdadm --detail /dev/md2
/dev/md2:
Version : 00.90
[code]....
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Nov 30, 2010
I 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
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Feb 20, 2011
This is message I get when I try and start itmdadm: /dev/md0 assembled from 2 drives - not enough to start the arrayBelow is the information I've collected about any help on how I can get the raid back up and going to I can get the data off of it would be awesome
sudo mdadm --examine --scan -v
ARRAY /dev/md0 level=raid10 num-devices=4 UUID=91c36708:a7cbb532:5b51dc92:ba008491
devices=/dev/sdd1,/dev/sdc1,/dev/sdb1,/dev/sda1
[code]...
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Aug 1, 2010
I had done a new lucid install to a 1 TB RAID 1 array using the alternate CD a few weeks back. I messed up that system trying to some hardware working that lucid doesn't have drivers for yet, so I gave up on it and reinstalled to a single 80 GB disk that I now want to move over to the RAID array.
I moved all of the existing files on the array to a single folder, then copied all of the folders from the 80 GB disk over to the array with permissions and symlinks (minus the contents of /proc and /sys, which I created empty).
These are the commands I used:
Quote:
p -a -d -R -v -t /media/raid_array /b*
cp -a -d -R -v -t /media/raid_array /d*
cp -a -d -R -v -t /media/raid_array /e*
cp -a -d -R -v -t /media/raid_array /h*
[Code]....
I tried to change fstab to use the 689a... for root, but when I try to boot, it's still trying to open /dev/disk/by-uuid/412d...
So then I booted from the single disk again and chrooted into the array, then ran update-initramfs -u. I got 3 "grep: /proc/modules: No such file or directory" errors, and "cat: /proc/cmdline: No such file or directory"- so I created directory /proc/modules, created an empty file /proc/cmdline, and ran the initramfs update again. Then I tried to shut down, which hung (probably because I was doing all of this from a terminal window in Gnome), so I killed the power after a couple of minutes.
It's still trying to use /dev/disk/by-uuid/412d... to boot.
What am I missing? I assume I just have to change the UUID to mount as root, but I don't know how.
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Apr 4, 2010
I'm about to install Ubuntu on two 250-gigabyte hard drives in a RAID 1 array, but I'm confused about how to partition my hard drives. How much space should I give to each partition? How many partitions should I create and where should I mount them? (I should mention that Ubuntu will be the only OS on this array.)
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May 11, 2011
Round two:I am trying to install a RAID 1 array on my system. I already have another RAID 1 array in there. I am using the BIOS RAID option to set up the array.Here's what dmraid -r tells me:
# dmraid -r
/dev/sda: pdc, "pdc_bajfedfacg", mirror, ok, 3906249984 sectors, data@ 0
/dev/sdb: pdc, "pdc_bajfedfacg", mirror, ok, 3906249984 sectors, data@ 0
[code]....
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Jul 20, 2009
I'm not able to spin down my harddisks in raid array. I did hdparm -S 240 /dev/sdb and the same for the second hdd. Smaller values like 2 minutes work. I don't have log files on this disks. How can I determine, which processes are accessing these disks? I have apache and samba running. Nobody is accessing the server.
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Mar 10, 2010
I have a raid 1 array which I did setup on a Centos box. I can configure the array fine the problem is every time is restart my machine I can no longer see the array and have to go create it all over again. I tried doing a few searches on it but have came up with nothing so far.
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Feb 17, 2011
I have a CentOS 5 based Linux system with a 3Ware 9550SU RAID card and four 500GB drives set up in a RAID5 array (3 in the array and 1 hot spare).
I want to 'replace' these drives with four 2TB drives without data loss. My server case has a total of 8 drive bays all hot-swap and all attached to the RAID card, this means I have four empty drive bays on the RAID card.
One thought is to put the four new 2TB drives in the empty drive bays, configure them in a new RAID5 array. Then the question is now to I "mirror" the original RAID5 array over to the new one?
This is just a thought though, I am not sure it will work. In short my question to this forum is how do I accomplish this upgrade?.
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Jul 15, 2010
I've been having troubles with software raid. In particular, the raid array becomes un "assembleable" after reboots. The config is CentOS 5, 4 sata discs (one by 160 containing OS, no raid and 3 2TB disks configured as a RAID 5 array - no spare drive). These drives were configured in anaconda and all seemed to go well (the drive and its lvm partitions worked and it finished rebuilding overnight). A couple of reboots later the drives cannot be assembled anymore and the machine won't boot. The error message says:
mdadm: /dev/md0 assembled from 1 drive and 1 spare - not enough to start the array.
Of course there are 3 drives and no spares in the array as configured. Manually starting the array with mdadm --assemble --scan gives the same message as does assembling the drive by specifying the individual parts. /proc/mdstat does recognize the 3 drives and when I look at the partition tables in fdisk, they show as being software raid. What could be wrong or steps to diagnose? I tried configuring the raid drives manually before going the anaconda route. Also, does anyone know I can edit the /etc/fstab file to disable them so the machine will at least boot. The (Repair filesystem) shell has the / drive mounted r/o.
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Jun 23, 2009
I need to mount my raid array on CentOS 5.2 samba server.
Here are my hardware specs:
Motherboard: Tyan S2510 LE dual PIII
CPU's: Intel PIII 850ghz socket 370
Memory: 4 gig Crucial 133 ECC SDRAM
OS: 2 x'x IBM Travelstar 6.4 gig 2.5 hard drives, (low heat/noise)
Storage: 4 x's Seagate 500 gig IDE 7200 rpm
RAID controller: 3Ware 7500-12 controller, (RAID 5) (66 mhz PCI bus)
NIC: 3COM 3C996B-T gigabit NIC, (66 mhz PCI bus)
I have the 2 IBM's set as RAID 1, (mirror) and the 4 Seagates as RAID 5, (1.5 TB) I have installed the OS with minor problems, (motherboard doesn't like the 2.6.18-128.1.14.el5 kernel, removed it from my grub.conf).
My problem is mounting the RAID array. I have done the following:
formatted with fdisk;
fdisk /dev/sdb
Then formatted with the following command;
mkfs.ext3 -m 0 /dev/sdb
The hard drive was formatted with the ext3 files system, but I have mounted it as an ext2 file system as I don't want 'journaling' to occur. I then edited my /ect/fstab like this: .....
Then: mount -a
When I go into my "home" directory and type ls, I get the following:
[root@hydra home]# ls -l
total 24
drwx------ 2 zog zog 4096 Jun 23 15:50 zog
lrwxrwxrwx 1 root root 6 Jun 23 15:46 home -> /home/
drwxrwxrwx 2 root root 16384 Jun 23 15:34 lost+found
drwxr-xr-x 2 root root 4096 Jun 23 17:18 tmp
Why my home directory is showing under home?
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Nov 17, 2009
Our server is a CybertronPC I2XV9080 Imperium Tower. It is equipped with a supermicro X7DVL-I Motherboard and Quad 750 GB SATA2 RAID edition hard drives in a raid 5 array. We tried to install Centos on the Raid5 array with Device-Mapper as the LVM. In the BIOS SATA Raid was enabled and the ICH RAID code base option was set to [Intel].
Intel Matrix Storage Manager Option ROM V5.6.4.1002 ESB2
RAID
ID Name Level Strip Size Status Bootable
0 Raid5 Raid 5 64KB 80GB Normal Yes
1 Raid_5 Raid 5 64kB 2000GB Normal Yes[code].....
Can I have multiple level raids across the same array or would that lead to problems as above? Is the root cause of my problem the fact that intel raid5 is not supported for Linux as based on the following link http:[url]....
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Apr 8, 2010
i have cretaed RAID on one of my server RAID health is ok but its shows warning. so what could be the problem. WARNING: 0:0:RAID-1:2 drives:153GB:Optimal Drives:2 (11528 Errors)
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Mar 25, 2010
I have a 10x2tb disk array that i'm trying to build into a single software raid 5 i have tried this 2 times now the first it made it to 58.7% and the machine locked up and the array would not restart after a reboot. On my 2nd try all was looking good until about 50% i noticed that the speed dropped in 1/2 and that ksoftirqd/2 is taking up a lot of cpu (about 90%) the md0_resync and md0_raid5 are also taking 60-90% when the build started they took 7%. when i do a dmesg i see a lot of the message compute_blocknr: map not correct.
For a little info on the physical setup this is running on an Atom 510 with 2GB of mem the drives are connected to an addonics 4-Port RAID 5 / JBOD SATA II PCI Controller using the sil3124 chipset. I'm using 2 addonics 5X1 SATA Port Multiplier connected to the controller to get the 10 drives attached. All drive show up and don't seem to have any issues. I'm running a fully updated as of 3/20/10 version of centos 5.4
I will let this continue to run over night but i expect it to be locked up by morning if it follows what the last attempt did.
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Sep 27, 2010
I have a NETGEAR ReadyNAS NV+ with four 1TB drives in a RAID-5 array. This is our primary file storage. This has previously been backed up to a hardware RAID-0 array directly attached to our Windows server. The capacity of this backup array is no longer sufficient. So the plan was, take a bunch of 200GB to 320GB drives (And a 750) I had kicking around, chuck them in a couple of old SCSI drive enclosures I have collecting dust, attach them via IDA/SATA-to-USB adaptors to a USB hub, attach that to the server, create a JBOD array spanning the disks, and back up the NAS to that. Performance is not an issue as this is just to be used for backup, with the idea being as near to zero cost as possible (Spend so far = NZ$100�ish).
The first hurdle I struck was Windows not supporting Dynamic Disks on USB drives (Required to create a spanned volume). At first I resisted using another machine (i.e. a machine running Ubuntu) as I didn't want to dedicate a piece of hardware to backing up the NAS. I then decided it would be acceptable to do this via a VM, which is what I've done.So I have 10.04 running under VMWare Server 2.0.2 under Windows Server 2008 R2. The disks are all presented to the VM. I wasn't sure if I was going to end up creating the array under LVM or something else, but I noticed Disk Utility has an option to create an array, so I tried that. When I add two 250GB drives, the array size is 500GB. When I then add a 160GB drive, the array size drops to 480GB. Huh? If I keep adding disks (Regardless of order) the final array size comes out at 1.8 TB, as per the attached screenshot. Now with the following drives, I expected something more like:
160 + 250 + 250+ 750 + 250 +200 + 200 + 250 + 320 + 250 + 320 = 3.2TB
Am I missing something or making a false assumption somewhere?
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Apr 28, 2009
I've just setup a new centos 5.3 server with a 3-disc raid 5 software RAID array. I've setup other software raid 5 arrays on this same hardware, whilst testing, and had no trouble... I only just installed 3 new drives and performed a new install from scratch.
Hardware is: 4800XP X2 64-bit, 2GB RAM, Albatron KI-690G mainboard with Marvel SATA controller (I think) - 4 ports.
SATA port 0 is system drive (OCZ vertex 32GB SSD)
SATA port 1 is Western Digital "green" 1TB 8MB cache SATA 2
SATA port 2 is Western Digital "green" 1TB 8MB cache SATA 2
SATA port 3 is Western Digital "green" 1TB 8MB cache SATA 2
Ports 1-3 in software raid MD0 (raid 5)
All of this was configured in the GUI setup, with LVM on top of software RAID 5 mounted on /var. Partition size is ~1.9TB
Trouble is I get all sorts of "hardware failure" messages at bootup and the MD driver reports it was only able to bring up 2 out of 3 drives in the RAID set... however the RAID set formatted fine during the setup?
Here is the relevent dmesg output...
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Dec 15, 2010
So I didn't notice when I setup my CentOS 5.5 server that I left / as RAID 0 on md1. All the rest are RAID 1. Is there a way I can modify the array to RAID 1 without a risk of data loss? I'm glad I caught this before I setup any other services. I've only setup smb so far...
[root@ftpserver ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md1 16G 3.0G 13G 20% /
[code]....
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May 7, 2011
I have a system with a 2TB RAID level 1 installed (2 x 2TB drives, configured as RAID1 through the BIOS). I installed Centos 5.5 and it runs fine. I now added another 2x2TB drives and configured them as RAID1 through the BIOS.
How do I add this new RAID volume to the existing logical volume?
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Jan 18, 2010
I'm breaking into the OS drive side with RAID-1 now. I have my server set up with a pair of 80 GB drives, mirrored (RAID-1) and have been testing the fail-over and rebuild process. Works great physically failing out either drive. Great! My next quest is setting up a backup procedure for the OS drives, and I want to know how others are doing this.
Here's what I was thinking, and I'd love some feedback: Fail one of the disks out of the RAID-1, then image it to a file, saved on an external disk, using the dd command (if memory serves, it would be something like "sudo dd if=/dev/sda of=backupfilename.img") Then, re-add the failed disk back into the array. In the event I needed to roll back to one of those snapshots, I would just use the "dd" command to dump the image back on to an appropriate hard disk, boot to it, and rebuild the RAID-1 from that.
Does that sound like a good practice, or is there a better way? A couple notes: I do not have the luxury of a stack of extra disks, so I cannot just do the standard mirror breaks and keep the disks on-hand, and using something like a tape drive is also not an option.
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Jun 9, 2011
so I setup a raid ten system and I was wondering what that difference between the active and spare drives is ? if I have 4 active drives then 2 the two stripes are then mirrored right?
root@wolfden:~# cat /proc/mdstat
Personalities : [raid0] [raid10]
md1 : active raid10 sda2[0] sdd2[3] sdc2[2] sdb2[1]
[code]....
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Jun 24, 2009
I've tried to install Fedora 11, both 32 and 64 on my main machine.It could not install as it stops on the first install window. I've already filed a bug but really haven't seen any feed back yet.The bug has something to do with Anaconda and the Raid array but I really can't tell.
I have an Intel Board (see signature). I am running intel raid software under W7 currently.It works fine. But, I'm wondering, when I attempt to install F!!, is my current raid set-up causing problems? Do I need to get rid of the intel raid software and use a Fedor/Linux raid program to manage the raid array??
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May 1, 2010
Is there a way to get the 10.04 Live CD to recognize my existing 9.10 installation and perform an upgrade without deleting all my files? I have been blocked out of Ubuntu 9.10 since December when I installed Windows 7 and it overwrote GRUB.
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Mar 23, 2010
I'm currently in the process of getting my server moved over from a Server 2003 machine to one based on Fedora 12. My issue is that I have an existing RAID5 array on a rr1740 card. When I install this in the new system each individual drive show up as sdc sdd etc not as one volume. I have tried installing the highpoint driver but I get an error that sata_mv cannon't be unloaded. I have tried adding this to /etc/modprobe.d/blacklist to no avail.
System currently looks like this. ASUS mini ITX Atom D510 based board with 2x on board SATA, attatched to these are a 160GB OS drive, 400GB data drive. Highpoint RR1740 PCI card with 5x500GB drives in RAID5.
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Mar 22, 2010
I'm currently in the process of getting my server moved over from a Server 2003 machine to one based on Fedora 12. My issue is that I have an existing RAID5 array on a rr1740 card. When I install this in the new system each individual drive show up as sdc sdd etc not as one volume. I have tried installing the highpoint driver but I get an error that sata_mv cannon't be unloaded. I have tried adding this to /etc/modprobe.d/blacklist to no avail. System currently looks like this. ASUS mini ITX Atom D510 based board with 2x on board SATA, attatched to these are a 160GB OS drive, 400GB data drive. Highpoint RR1740 PCI card with 5x500GB drives in RAID5.
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