[dm-devel] Antw: Re: Q: md-RAID1 creation with I/O error (attempt to access beyond end of device)

[Ulrich Windl]

>>> Rahsaan Page <rahsaan.page at gmail.com> schrieb am 22.10.2010 um 14:46 in
Nachricht <AANLkTineg_wHmd_es91=aGpr-bRLBp=xNikiO7i8MWBV at mail.gmail.com>:
> Hi Ulrich,
> 
> I dont think thats going to work, arent you suppose to create the raid with
> xdisk, than create LVM on top of the raid?

Hi!

I never heard of "xdisk". Also I decided to use MD for RAID, and not LVM, because the Linux implementation needs a third device to handle the mirror log, while MD can host a bitmap on the members itself. In my setup I'd partition the MD-device, then create an LVM physical volume in one of the partitions...

Regards,
Ulrich


> 
> On Thu, Oct 21, 2010 at 7:16 AM, Ulrich Windl <
> Ulrich.Windl at rz.uni-regensburg.de> wrote:
> 
> > Hi,
> >
> > not an iSCSI question, but maybe here's the right audience: I had
> > sucessfully created a RAID1 using mdadm, multipath, iSCSI and some SAN
> > storage on SLES10 SP3+Updates on x86_64. When I tried to do the same thing
> > on a comparable machine, the RAID could not be created, because something
> > tried to access the disk at a bad position. I reapeated the attempt with
> > another set of disks of the same size, and it also failed.
> >
> > Details:
> > # mdadm --verbose --create /dev/md5 --raid-devices=2 --level=raid1
> > --bitmap=internal --assume-clean /dev/mapper/EVA1_L232_host05
> > /dev/mapper/EVA2_L232_host05
> > mdadm: /dev/mapper/EVA1_L232_host05 appears to be part of a raid array:
> >    level=raid1 devices=2 ctime=Thu Oct 21 12:26:18 2010
> > mdadm: /dev/mapper/EVA2_L232_host05 appears to be part of a raid array:
> >    level=raid1 devices=2 ctime=Thu Oct 21 12:26:18 2010
> > mdadm: size set to 31457216K
> > Continue creating array? y
> > mdadm: RUN_ARRAY failed: Input/output error
> > mdadm: stopped /dev/md5
> > hostname:~ # tail -24 /var/log/messages
> >     Oct 21 12:28:05 hostname kernel: md: md5 stopped.
> > Oct 21 12:28:07 hostname kernel: md: md5 stopped.
> > Oct 21 12:29:46 hostname kernel: md: bind<dm-21>
> > Oct 21 12:29:46 hostname kernel: md: bind<dm-14>
> > Oct 21 12:29:46 hostname kernel: raid1: raid set md5 active with 2 out of 2
> > mirrors
> > Oct 21 12:29:46 hostname kernel: md5: bitmap file is out of date (0 < 1) --
> > forcing full recovery
> > Oct 21 12:29:46 hostname kernel: md5: bitmap file is out of date, doing
> > full recovery
> > Oct 21 12:29:46 hostname kernel: attempt to access beyond end of device
> > Oct 21 12:29:46 hostname kernel: dm-14: rw=8, want=62914568, limit=62914560
> > Oct 21 12:29:46 hostname kernel: attempt to access beyond end of device
> > Oct 21 12:29:46 hostname kernel: dm-21: rw=8, want=62914568, limit=62914560
> > Oct 21 12:29:46 hostname kernel: md5: bitmap initialized from disk: read
> > 15/16 pages, set 489472 bits, status: -5
> > Oct 21 12:29:46 hostname kernel: md5: failed to create bitmap (-5)
> > Oct 21 12:29:46 hostname kernel: md: pers->run() failed ...
> > Oct 21 12:29:46 hostname kernel: md: md5 stopped.
> > Oct 21 12:29:46 hostname kernel: md: unbind<dm-14>
> > Oct 21 12:29:46 hostname kernel: md: export_rdev(dm-14)
> > Oct 21 12:29:46 hostname kernel: md: unbind<dm-21>
> > Oct 21 12:29:46 hostname kernel: md: export_rdev(dm-21)
> >
> > hostname:~ # mdadm --query -X /dev/mapper/EVA2_L232_host05
> > mdadm: WARNING: bitmap file is not large enough for array size 62914432!
> >
> >        Filename : /dev/mapper/EVA2_L232_host05
> >           Magic : 6d746962
> >         Version : 4
> >            UUID : c522ab5a:24f292a0:0b3d7356:64ade12a
> >          Events : 0
> >  Events Cleared : 0
> >           State : Out of date
> >       Chunksize : 64 KB
> >          Daemon : 5s flush period
> >      Write Mode : Normal
> >       Sync Size : 31457216 (30.00 GiB 32.21 GB)
> >          Bitmap : 489472 bits (chunks), 489472 dirty (100.0%)
> > hostname:~ # mdadm --query -X /dev/mapper/EVA1_L232_host05
> > mdadm: WARNING: bitmap file is not large enough for array size 62914432!
> >
> >        Filename : /dev/mapper/EVA1_L232_host05
> >           Magic : 6d746962
> >         Version : 4
> >            UUID : c522ab5a:24f292a0:0b3d7356:64ade12a
> >          Events : 0
> >  Events Cleared : 0
> >           State : Out of date
> >       Chunksize : 64 KB
> >          Daemon : 5s flush period
> >      Write Mode : Normal
> >       Sync Size : 31457216 (30.00 GiB 32.21 GB)
> >          Bitmap : 489472 bits (chunks), 489472 dirty (100.0%)
> >
> > "blockdev --getsize" reports "62914560" for each LUN being used.
> >
> > Regards,
> > Ulrich
> >
> >
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