Hi Marc,
My experiences and workaround on sles 9 and 10 agrees with yours; zipl-ing a
multipath LUN on sles 10 rejects it with message
Error: Unsupported device driver 'device-mapper'
But on sles 11 zipl will accept multipath LUN and reports
Target device information
Device..........................: fd:0a
Device name.....................: dm-10
Device driver name..............: device-mapper
Type............................: disk device
Disk layout.....................: SCSI disk layout
Geometry - heads................: 0
Geometry - sectors..............: 0
Geometry - cylinders............: 0
Geometry - start................: 0
File system block size..........: 4096
Physical block size.............: 512
Device size in physical blocks..: 64260
... and ..
Preparing boot device: dm-10.
Detected plain SCSI partition.
Writing SCSI master boot record.
Syncing disks...
Done.
I think the disk geometry of 0's looks suspicious.
And zipl of the same LUN when it's not multipath-ed reports seeing the 'Target
device' as a
"Type ...: disk partition" not a "Type ...: disk device"
Target device information
Device..........................: 08:10
Partition.......................: 08:11
Device name.....................: sdb
Device driver name..............: sd
Type............................: disk partition
Disk layout.....................: SCSI disk layout
Geometry - heads................: 2
Geometry - sectors..............: 50
Geometry - cylinders............: 1024
Geometry - start................: 16065
File system block size..........: 4096
Physical block size.............: 512
Device size in physical blocks..: 64260
...
Preparing boot device: sdb.
Detected SCSI PCBIOS disk layout.
Writing SCSI master boot record.
Syncing disks...
Done
Maybe the zipl authors in Germany can comment.
> -----Original Message-----
> From: Linux on 390 Port [mailto:[email protected]] On Behalf Of
> Marc Schoechlin
> Sent: Thursday, May 28, 2009 10:11 AM
> To: [email protected]
> Subject: Re: sles11 zipl multipath /boot problem
>
> Hi John,
>
> On Wed, May 27, 2009 at 03:48:00PM -0400, Romanowski, John (OFT) wrote:
> > On a z10 I have a sles 11 with multipath /boot LUN and a separate
> multipath / LUN
> >
> > sles 11 Storage Guide says sles 11 supports a multipath /boot:
> > "DM-MP is now available and supported for /boot and /root in SUSE
> Linux Enterprise Server 11." (Which I think means zipl can now write
> the scsi bootloader to a multipath LUN.)
>
> unluckily, it's a long time ago i played around with scsi/fcp on z
> Series - but if i remember correctly,
> there it is no possibility to use zipl on a multipath device (i.e.
> /dev/mpath0....).
>
> As i can remember, a working procedure was:
> - Boot the system from a single path without any multipathing
> - Execute "zipl"
> - Boot the zipl-entry with enabled multipathing
>
> Maybe recent/future releases of the s390-tools include support for zipl
> on mpath-devices.
>
> Best regards
> Marc Schoechlin
>
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