Hello. I'm trying to figure out multipath on a StorageWorks HSG80
contoller. I'm using Ubuntu "Dapper" with the following software
versions:
kernel: 2.6.15-20-server
multipath-tools: 0.4.7-1ubuntu4
>From what I've been reading[1], I gather that I need to use the
dm-hp-sw kernel module. So I applied the patches[2,3,4,5] to
the kernel and setup the /etc/multipath.conf as follows:
devices {
device {
vendor "DEC"
product "HSG80"
path_grouping_policy group_by_serial
path_checker hp_sw
features "1 queue_if_no_path"
hardware_handler "1 hp_sw"
}
}
multipaths {
multipath {
wwid 60001fe10015bf500009947159810015
alias red
}
}
>From what I can tell, it is basically working:
sfeehan@dogwood:~$ sudo multipath -ll
red (360001fe10015bf500009947159810015)
[size=203 GB][features=1 queue_if_no_path][hwhandler=1 hp_sw]
\_ round-robin 0 [prio=2][active]
\_ 0:0:0:1 sda 8:0 [active][ready]
\_ 0:0:1:1 sdb 8:16 [active][ready]
\_ round-robin 0 [prio=2][enabled]
\_ 0:0:2:1 sdc 8:32 [active][ghost]
\_ 0:0:3:1 sdd 8:48 [active][ghost]
And now the problem: I see quite a few errors in dmesg:
[42949392.230000] sd 0:0:2:1: Device not ready.
[42949392.230000] end_request: I/O error, dev sdc, sector 426583424
[42949392.230000] printk: 515 messages suppressed.
[42949392.230000] Buffer I/O error on device sdc, logical block
213291712
[42949392.230000] sd 0:0:2:1: Device not ready.
[42949392.230000] end_request: I/O error, dev sdc, sector 426583424
[42949392.230000] sd 0:0:3:1: Device not ready.
[42949392.230000] end_request: I/O error, dev sdd, sector 426583424
[42949392.230000] sd 0:0:3:1: Device not ready.
[42949392.230000] end_request: I/O error, dev sdd, sector 426583424
And when I put LVM on top of the multipath device I get lots
of errors:
sfeehan@dogwood:~$ sudo pvcreate /dev/mapper/red
Physical volume "/dev/mapper/red" successfully created
sfeehan@dogwood:~$ sudo vgcreate vg0 /dev/mapper/red
Found duplicate PV qDhK4gPTGtzXAm7jPQf0uf07a0FQs2qL: using /dev/sdb1
not /dev/sda1
/dev/sdc: read failed after 0 of 2048 at 0: Input/output error
/dev/sdd: read failed after 0 of 2048 at 0: Input/output error
Found duplicate PV qDhK4gPTGtzXAm7jPQf0uf07a0FQs2qL: using /dev/sda1
not /dev/sdb1
Found duplicate PV qDhK4gPTGtzXAm7jPQf0uf07a0FQs2qL: using /dev/sdb1
not /dev/sda1
/dev/sdc: read failed after 0 of 1024 at 0: Input/output error
/dev/sdc: read failed after 0 of 2048 at 0: Input/output error
/dev/sdd: read failed after 0 of 1024 at 0: Input/output error
/dev/sdd: read failed after 0 of 2048 at 0: Input/output error
Volume group "vg0" successfully created
sfeehan@dogwood:~$
sfeehan@dogwood:~$
sfeehan@dogwood:~$ sudo lvcreate -L 10G -n test vg0
Found duplicate PV qDhK4gPTGtzXAm7jPQf0uf07a0FQs2qL: using /dev/sdb1
not /dev/sda1
/dev/sdc: read failed after 0 of 2048 at 0: Input/output error
/dev/sdd: read failed after 0 of 2048 at 0: Input/output error
Logical volume "test" created
sfeehan@dogwood:~$
So... what are the errors about? Are they significant? What
if anything can I do to resolve them?
Thanks.
Steve
[1] StorageWorks multipath support
http://www.redhat.com/archives/dm-devel/2005-June/msg00105.html
[2] [PATCH RFT/RFC 1/4] export block layer helpers
http://www.redhat.com/archives/dm-devel/2005-September/msg00097.html
[3] [PATCH RFT/RFC 2/4] add dm_scsi helpers
http://www.redhat.com/archives/dm-devel/2005-September/msg00098.html
[4] [PATCH RFT/RFC 3/4] convert dm emc
http://www.redhat.com/archives/dm-devel/2005-September/msg00099.html
[5] [PATCH RFT/RFC 4/4] add dm-hp-sw hw handler
http://www.redhat.com/archives/dm-devel/2005-September/msg00100.html
--
Steve Feehan
--
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