Re: RAID5 causing lockups

["Mike Black" <mblack@csi-inc.com>]

Why don't you try creating a 3-disk RAID5, 4-disk, etc.
Perhaps you have one bad disk which this should point out.

Also...I don't think we ever heard what kind of power supply you have.
You might be overloading your system.  If power is a problem this will also probably show good behavior with 3 disks instead of 6.

So...if you find out that 3 is OK, 4 is OK, 5 causes problems -- then you try the 5-disk again with a different drive than the last
one and if it still fails you probably have a power problem.

----- Original Message ----- 
From: "Corey McGuire" <coreyfro@coreyfro.com>
To: <linux-raid@vger.kernel.org>
Sent: Wednesday, June 25, 2003 11:54 PM
Subject: Re: RAID5 causing lockups


> Well, two of my drives did have an older bios, but the upgrade changed nothing.
>
> I noticed that even unmounted, as long as I didn't raidstop the device, the system still crashes.
>
> I tried setting down my bios as much as possible, and I am looking to do the same with the kernel, 2.4.21.  I'll try the magic
sysrq key, but I can't find my nulmodem cable to save my life, so I'll have to barrow one from work.
>
> My server marches on, but without /dev/md2... I'll try just letting it sit, /dev/md2 intact, over night, but for now, I need it
up, even if it is only for fits and spurts.
>
> Thanks everyone, keep the ideas rolling in.
>
> <sigh>
>
> >Hey folks,
> >
> >I just upgraded my system from a ~200GB mirror to a ~1TB RAID5, but all has
> >not transitioned well.
> >
> >I really don't know how to debug this issue, though I have tried.  I gave
> >up this morning before work, but I was going to try the magickey next
> >(something I don't really know how to use, but anything for a clue)
> >followed by upgrading to 2.4.21.
> >
> >The lock up is typical to a system with a failing drive; the system is
> >responsive to input, but nothing happens.  Keyboard works fine, but
> >programs become idle (not really crashing.)  I tried keeping "top" up,
> >hoping I would see something obvious, like raid5syncd doing something
> >strange, but if it does, top doesn't update after the problem.
> >
> >The lockups happen even if the system is doing nothing (other than
> >raid5syncd, which is awfully busy since my RAID won't stay up)
> >
> >If I unmount the RAID5 and RAIDSTOP it, my system will work fine, but I'm
> >out 1TB of disk.  Right now, I have it running the bare essentials (all
> >services on, but my /home directory has only public_html and mail stuff for
> >each user.)
> >
> >Anything I can do to get more information out of this problem?  I don't
> >really know where to look.
> >
> >
> >System Infro
> >=======================================================================
> >
> >My kernel is 2.4.20, my raid tools is raidtools-0.90, no patches on
> >anything, home built distro (linux from scratch.)  Had been running on a
> >mirror for nearly a year.
> >
> >Each drive on my system is connected to promise UltraATA 100 controllers.
> >I have 6 drives and 3 controllers.  Each drive is a 200GB WD drive, set to
> >"Single/Master" on their channel.
> >
> >No device has a slave.
> >
> >Drives are hda hdc hde hdg hdi hdk
> >
> >------- Each drive is configured exactly like the device below -------
> >
> >Disk /dev/hda: 255 heads, 63 sectors, 24321 cylinders
> >Units = cylinders of 16065 * 512 bytes
> >
> >   Device Boot    Start       End    Blocks   Id  System
> >/dev/hda1             1       319   2562336   fd  Linux raid autodetect
> >/dev/hda2           320       352    265072+  82  Linux swap
> >/dev/hda3           353     24321 192530992+  fd  Linux raid autodetect
> >
> >------------------------- Here is my raidtab -------------------------
> >
> >raiddev /dev/md0
> >   raid-level            1
> >   chunk-size           32
> >   nr-raid-disks         2
> >   nr-spare-disks        0
> >   persistent-superblock 1
> >   device        /dev/hda1
> >   raid-disk             0
> >   device        /dev/hdc1
> >   raid-disk             1
> >
> >raiddev /dev/md1
> >   raid-level            1
> >   chunk-size           32
> >   nr-raid-disks         2
> >   nr-spare-disks        0
> >   persistent-superblock 1
> >   device        /dev/hde1
> >   raid-disk             0
> >   device        /dev/hdg1
> >   raid-disk             1
> >
> >raiddev /dev/md2
> >   raid-level            5
> >   chunk-size           32
> >   nr-raid-disks         6
> >   nr-spare-disks        0
> >   persistent-superblock 1
> >   device        /dev/hda3
> >   raid-disk             0
> >   device        /dev/hdc3
> >   raid-disk             1
> >   device        /dev/hde3
> >   raid-disk             2
> >   device        /dev/hdg3
> >   raid-disk             3
> >   device        /dev/hdi3
> >   raid-disk             4
> >   device        /dev/hdk3
> >   raid-disk             5
> >
> >raiddev /dev/md3
> >   raid-level            1
> >   chunk-size           32
> >   nr-raid-disks         2
> >   nr-spare-disks        0
> >   persistent-superblock 1
> >   device        /dev/hdi1
> >   raid-disk             0
> >   device        /dev/hdk1
> >   raid-disk             1
> >
> >-------------------------- Here is my fstab --------------------------
> >
> ># Begin /etc/fstab
> >
> ># filesystem   mount-point     fs-type    options           dump fsck-order
> >
> >/dev/md0       /               reiserfs   defaults             1 1
> >/dev/md1       /mnt/backup     reiserfs   noauto,defaults      1 3
> >/dev/md2       /home           reiserfs   defaults             1 2
> >/dev/hda2      swap            swap       pri=42               0 0
> >/dev/hdc2      swap            swap       pri=42               0 0
> >/dev/hde2      swap            swap       pri=42               0 0
> >/dev/hdg2      swap            swap       pri=42               0 0
> >/dev/hdi2      swap            swap       pri=42               0 0
> >/dev/hdk2      swap            swap       pri=42               0 0
> >proc           /proc           proc       defaults             0 0
> >
> ># End /etc/fstab
> >
> >=======================================================================
> >
> >Let me know if I missed anything (probably lots.)
> >
> >Thanks for your time.
> >
> >
> >/\/\/\/\/\/\ Nothing is foolproof to a talented fool. /\/\/\/\/\/\
> >
> >coreyfro@coreyfro.com
> >http://www.coreyfro.com/
> >http://stats.distributed.net/rc5-64/psummary.php3?id=196879
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> /\/\/\/\/\/\ Nothing is foolproof to a talented fool. /\/\/\/\/\/\
>
> coreyfro@coreyfro.com
> http://www.coreyfro.com/
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> ICQ : 3168059
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