Le dimanche 07 mai 2006 à 17:01 +0300, Erez Zilber a écrit : > Some more questions: > > 1. I couldn't find the config file. Where is it located? Is there any > documentation about it? The config file normal location is /etc/multipath.conf > 2. How can I configure fancy naming for devices (instaed of using > something like /dev/mapper/3600c0ff00000000007c1d121c397f503) in > the config file? Have a look at the templates provided with the upstream package. > 3. How can I config the delay from the time that a device has failed > until the dm moves to the next active device? Again, I understand > that I should use the config file somehow. > Ditto. > I tried to run the following test: I created a multipath device with 2 > physical devices (/dev/sda & /dev/sdb). I started running traffic on the > multipath device. All traffic ran through /dev/sda. Then, I disconnected > the iSCSI target that was represented by /dev/sda. After some time, the > traffic was directed to /dev/sdb. I stopped the traffic, disconnected > the iSCSI target that was represented by /dev/sdb and reconnected > /dev/sda. Now, if I run `multipath -l`, I see the following output: > > 3600c0ff00000000007c1d121c397f503 > [size=10 GB][features=0][hwhandler=0] > \_ round-robin 0 [prio=0][enabled] > \_ 0:0:0:0 sda 8:0 [failed][undef] > \_ round-robin 0 [prio=0][enabled] > \_ 1:0:0:0 sdb 8:16 [failed][faulty] > > /dev/sdb is dead and I'm ok with it. However, /dev/sda is alive. I was > able to run the following command: > > dd if=/dev/sda of=/dev/null count=100000 > > However, if I run the following command: > > dd if=/dev/mapper/3600c0ff00000000007c1d121c397f503 of=/dev/null > count=100000 > > This is what I get: > > dd: reading `/dev/mapper/3600c0ff00000000007c1d121c397f503': > Input/output error > 0+0 records in > 0+0 records out > 0 bytes (0 B) copied, 0.00067 seconds, 0.0 kB/s > > Can't it recongnize that a device that has failed (/dev/sda) is back to > life? > Is the daemon (multipathd) running ? The daemon takes care of path revalidation. Regards, cvaroqui -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
