We are using multipath daemon Carsten...
I usem
DASD for S.O
LUNS for database files
orap103:~ # lscss
Device Subchan. DevType CU Type Use PIM PAM POM CHPIDs
----------------------------------------------------------------------
0.0.0800 0.0.0000 1732/01 1731/01 yes 80 80 FF 20000000 00000000
0.0.0801 0.0.0001 1732/01 1731/01 yes 80 80 FF 20000000 00000000
0.0.0802 0.0.0002 1732/01 1731/01 yes 80 80 FF 20000000 00000000
*** 02 channels for disk attached to machine with DEDICATE directive on USER
DIRECT ***
*0.0.1734 0.0.0003 1732/03 1731/03 yes 80 80 FF 0E000000 00000000
0.0.1434 0.0.0004 1732/03 1731/03 yes 80 80 FF 0B000000 00000000
*
*** ckd volume to S.O
0.0.0100 0.0.0005 3390/0C 3990/E9 yes C0 C0 FF 01050000 00000000
*
0.0.0200 0.0.0006 3390/0C 3990/E9 yes C0 C0 FF 01050000 00000000
0.0.0201 0.0.0007 3390/0C 3990/E9 yes C0 C0 FF 01050000 00000000
0.0.0202 0.0.0008 3390/0C 3990/E9 yes C0 C0 FF 01050000 00000000
0.0.0203 0.0.0009 3390/0C 3990/E9 yes C0 C0 FF 01050000 00000000
0.0.000C 0.0.000A 0000/00 2540/00 80 80 FF 00000000 00000000
orap103:~ # multipath -ll
mpath1 (3600507630affc485000000000000705c) dm-4 IBM,2107900
[size=500G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=2][active]
\_ 1:0:0:1079787632 sdb 8:16 [active][ready]
\_ 0:0:0:1079787632 sdd 8:48 [active][ready]
mpath0 (3600507630affc4850000000000007153) dm-3 IBM,2107900
[size=200G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=2][active]
\_ 0:0:0:1079197809 sda 8:0 [active][ready]
\_ 1:0:0:1079197809 sdc 8:32 [active][ready]
orap103:~ #
Disks come from a DS 8700
multipath.conf
defaults {
polling_interval 30
failback immediate
no_path_retry 5
rr_min_io 100
path_checker tur
user_friendly_names yes
}
# Uncomment them if needed on this system
device {
vendor "IBM"
product "2107900"
path_grouping_policy group_by_serial
}
=====
we are using luns with LVM too..
We create pv's directecty to /dev/mapper/mpathX and etc...
On Wed, Apr 6, 2011 at 4:36 AM, Carsten Otte <[email protected]> wrote:
> Your message does'nt tell me anything about your setup. I'm guessing that
> you're not using the SCSI
> multipath daemon and use sdX devices directly. In that case I think you
> should a) get a second path
> to your device, b) setup multipath daemon, and c) use queue_if_no_path
> setting to ensure that your
> filesystems remain usable.
>
> with kind regards
> Carsten Otte
> IBM Linux Technology Center / Boeblingen lab
> --
> omnis enim res, quae dando non deficit, dum habetur et non datur, nondum
> habetur, quomodo habenda est
>
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