Hi Much thanks for your insights, you're right multipath was keep the I/O on queue and lvm didn't fail the mirror I had to create a device section on multipath.conf so that the features=0 would be on used by multipath Best Regards Jose > jose nuno neto [jose.neto@liber4e.com] wrote: >> Much thanks for your interest >> im putting more info below >> >> > jose nuno neto [jose.neto@liber4e.com] wrote: >> >> Hi >> >> >> >> I'm trying to test the failure of a SAN Mirrored Lv, and the recover >> and >> >> check for data lost. >> >> >> >> Im runing RedHat 5.4 >> >> 2.6.18-164.2.1.el5 >> >> lvm2-2.02.46-8.el5_4.1 >> >> multipath -l -v2 | grep -A 7 3600a0b800048f9b200000c2b4b5980b7 >> mpath12 (3600a0b800048f9b200000c2b4b5980b7) dm-8 SUN,CSM200_R >> [size=52G][features=1 queue_if_no_path][hwhandler=1 rdac][rw] >> \_ round-robin 0 [prio=0][enabled] >> \_ 7:0:1:1 sdo 8:224 [active][undef] >> \_ 9:0:1:1 sdq 65:0 [active][undef] >> \_ round-robin 0 [prio=0][enabled] >> \_ 7:0:0:1 sdd 8:48 [active][undef] >> \_ 9:0:0:1 sdf 8:80 [active][undef] >> >> Before UnPluging >> dmsetup status mpath12 >> 0 109051904 multipath 2 0 0 0 2 1 E 0 2 0 8:224 A 0 65:0 A 0 E 0 2 0 >> 8:48 >> A 0 8:80 A 0 >> >> echo offline > /sys/block/sdd/device/state >> echo offline > /sys/block/sdo/device/state >> echo offline > /sys/block/sdq/device/state >> echo offline > /sys/block/sdf/device/state >> >> dmsetup status mpath12 >> 0 109051904 multipath 2 0 0 0 2 1 E 0 2 0 8:224 F 1 65:0 F 1 E 0 2 0 >> 8:48 >> F 1 8:80 F 1 > > I was actually asking for "dmsetup status <mirror-device>" rather than > multipath device. I didn't know that you were using multipath devices!!! > > Anyway, looks like you have mpath12 that probably queues I/O on path > failures rather than failing them back to upper layers. In other words, > if you were to run "dd" or any other app to mpath12, it would hang too. > > mpath12 seems to keep the request and forever wait for the paths to > become available again in your case. If you really want it to fail, > configure your multipath accordingly. > > Thanks, Malahal. > PS: "features=1 queue_if_no_path" in your 'multipath -ll' output is the > source of error here... > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > -- > This message has been scanned for viruses and > dangerous content by MailScanner, and is > believed to be clean. > -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/