Re: (reiserfs) Re: 2.4.0-test2-ac2 with RAID lockup

From: Vladimir V. Saveliev (vs@namesys.botik.ru)
Date: Mon Jul 03 2000 - 04:45:00 EST


"Vladimir V. Saveliev" wrote:

> Russell Coker wrote:
>
> > I am using RAID-1 with two 46G IBM ATA-66 hard drives, the RAID-1 is on
> > /dev/hda4 and /dev/hda4 and is 43510604 blocks in size.
> >
> > Here's the fdisk output from /dev/hdc, /dev/hda is exactly the same (I used
> > dd to copy the partition table).
> >
> > Disk /dev/hdc: 255 heads, 63 sectors, 5606 cylinders
> > Units = cylinders of 16065 * 512 bytes
> >
> > Device Boot Start End Blocks Id System
> > /dev/hdc1 1 33 265041 82 Linux swap
> > /dev/hdc2 34 36 24097+ 83 Linux
> > /dev/hdc3 37 189 1228972+ 83 Linux
> > /dev/hdc4 190 5606 43512052+ 83 Linux
> >
> > Here is my current /etc/raidtab:
> > raiddev /dev/md0
> > raid-level 1
> > nr-raid-disks 2
> > persistent-superblock 1
> > chunk-size 4k
> > device /dev/ide/host0/bus0/target0/lun0/part4
> > raid-disk 0
> > device /dev/ide/host0/bus1/target0/lun0/part4
> > raid-disk 1
> >
> > Here is my df output:
> > Filesystem 1k-blocks Used Available Use% Mounted on
> > /dev/ide/host0/bus0/target0/lun0/part3
> > 1228916 952728 276188 78% /
> > /dev/ide/host0/bus0/target0/lun0/part2
> > 23333 4172 17957 19% /boot
> > /dev/md/0 43510604 557652 42952952 1% /mnt
> >
> > I am migrating to devfs as you will notice. I started playing with devfs
> > AFTER the first time RAID locked up on me so I know it's not caused by devfs.
> > I have had RAID lockup with and without devfs.
> >
> > The first time it locked up I could run ps/top/etc but any attempt to sync
> > etc would hang (D state).
> > The second time it was more serious. The command:
> > ls -al /proc/247
> > would go D state, so ps, top, etc would all hang. Pid 247 was named.
> >
> > At the time of the hang the only process using the RAID device was a bonnie++
> > test run on a ReiserFS file system. I doubt that ReiserFS or the drive
> > hardware was at fault because I spent an entire week running various bonnie++
> > tests on /dev/hda4 with ReiserFS and ext2 without any problems at all. All
> > the evidence I have suggests that ReiserFS is not at fault, however I have
> > CC'd the ReiserFS list (just in case) and I am continuing to run tests.
>
> Hi
> Just to make sure, that it is reiserfs problem - would you mind to try to hang
> the ext2fs?

Whoops :)
Meant: it is NOT reiserfs problem

Thanks,
vs

>
>
> Thanks,
> vs
>
> >
> >
> > The bonnie++ command was:
> > bonnie++ -s 512
> >
> > It seems that running the bonnie++ command on it's own does not cause a hang,
> > it's only when I redirect stdout and stderr to files on the same file system
> > that problems occur. I've just run another test and had it hang badly enough
> > that I couldn't login via telnet or ssh (the machine has no monitor).
> >
> > This time it got through the first run but on the second run (with parameters
> > "-s 1024 -n 60") it hung.
> >
> > The machine in question is a test machine. So if anyone has any experimental
> > patches etc they want me to run then please let me know.
> >
> > Russell Coker

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