Using multipath ... good! And creating PVs via the "coalesced" devices (under /dev/mapper) ... excellent!
Be sure to also exclude /dev/sd* from LVM scanning so that you don't accidentally hit the individual paths directly. There is exclusion capability in /etc/lvm/lvm.conf. See the "filter =" statement, for which there should be several examples in that file. -- R; <>< Rick Troth Velocity Software http://www.velocitysoftware.com/ 2011/4/6 Rogério Soares <rogerio.soa...@gmail.com>: > 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 <co...@de.ibm.com> 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 >> >> ---------------------------------------------------------------------- >> For LINUX-390 subscribe / signoff / archive access instructions, >> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or >> visit >> http://www.marist.edu/htbin/wlvindex?LINUX-390 >> ---------------------------------------------------------------------- >> For more information on Linux on System z, visit >> http://wiki.linuxvm.org/ >> > > ---------------------------------------------------------------------- > For LINUX-390 subscribe / signoff / archive access instructions, > send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit > http://www.marist.edu/htbin/wlvindex?LINUX-390 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
