> > I understand that sdc & sdd are mapped to dm-1. However, I don't > > understand how to use dm-1. For example, I can't run INQUIRY on it: > > > > seed1:~ # sg_inq /dev/dm-1 > > Both SCSI INQUIRY and fetching ATA information failed on /dev/dm-1 > > All things that work on /dev/sdc may not work on /dev/dm-1. You should > use /dev/sdc instead of /dev/dm-1 for those cases. You should be able to > use /dev/dm-1 for normal I/O (like dd, mounting etc.) I understand. I've tried disktest, and it work ok. I have another question - I'm running a single iSCSI initiator against 2 iSCSI target. I started disktest on /dev/dm-1 and after a few seconds, I disconnected the primary target. It took ~2 minutes until it failed over to the secondary device. During these ~2 minutes, it seemed that disktest is still reading data from the target, just slower. That's very strange. After failover was completed, I was able to use the secondary device. I have 2 questions: 1. Which parameter in multipath.conf do I need to change in order to failover in a few seconds? Is it polling_interval? I saw that the default value is 5 seconds, which should be ok. 2. Before multipath decided that it needs to failover, why did I see that traffic is still running? It had no device to work with at that time. Thanks, Erez
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