Hello, What you were seeing was the stale mount info. No "disk" is going to survive an hour disconnected. Even a short disconnect will cause a SCSI disk error and Linux to remount the volume RO.
Best practices for iSCSI connectivity is redundant switches and configure MPIO to use both paths when up for better performance and re-route I/O when a path fails. Regards, Don On Thu, Apr 4, 2013 at 6:11 AM, parveen kumar <[email protected]>wrote: > I tried to find out for how many seconds/hours iscsi session try to > re-establish the old connection if LAN disconnects between Host and Storage > (or you can say for how many seconds/hours iscsi will try for login in > target). > > > In my case i had mounted the 1TB partition on my CentOS release 5.3 > (Final) host/server from storage. > > i am using that 1TB volume and able to write data on it. > > Today i switched off the LAN switch for 1 hour, and after 1 hour i am able > to see the iscsi partition mounted on my host/server and its also showing > in "fdisk -l" but m not able to write data no it :o > > ========================================================= > Below error when i switch off the LAN switch (the output of > /var/log/messages) > ========================================================= > Apr 4 13:51:15 master kernel: ping timeout of 5 secs expired, last rx > 4559435595, last ping 4559440595, now 4559445595 > Apr 4 13:51:15 master kernel: connection1:0: iscsi: detected conn error > (1011) > Apr 4 13:51:16 master iscsid: Kernel reported iSCSI connection 1:0 error > (1011) state (3) > Apr 4 13:51:18 master /usr/sbin/gmetad[4843]: data_thread() got not > answer from any [cluster] datasource > Apr 4 13:51:58 master last message repeated 3 times > Apr 4 13:53:13 master last message repeated 4 times > Apr 4 13:53:16 master kernel: session1: iscsi: session recovery timed > out after 120 secs > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master last message repeated 17 times > Apr 4 13:53:16 master kernel: iscsi: cmd 0x28 is not queued (8) > Apr 4 13:53:16 master kernel: iscsi: cmd 0x28 is not queued (8) > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master last message repeated 3 times > Apr 4 13:53:16 master kernel: sd 14:0:0:6: SCSI error: return code = > 0x00010000 > Apr 4 13:53:16 master kernel: end_request: I/O error, dev sde, sector > 531628095 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 66453504 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master last message repeated 2 times > Apr 4 13:53:16 master kernel: iscsi: cmd 0x28 is not queued (8) > Apr 4 13:53:16 master last message repeated 4 times > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master kernel: sd 14:0:0:6: SCSI error: return code = > 0x00010000 > Apr 4 13:53:16 master kernel: end_request: I/O error, dev sde, sector > 475005183 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 59375640 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master kernel: sd 14:0:0:6: SCSI error: return code = > 0x00010000 > Apr 4 13:53:16 master kernel: end_request: I/O error, dev sde, sector > 475005175 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 59375639 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > Apr 4 13:53:16 master kernel: iscsi: cmd 0x2a is not queued (8) > Apr 4 13:53:16 master kernel: sd 14:0:0:6: SCSI error: return code = > 0x00010000 > Apr 4 13:53:16 master kernel: end_request: I/O error, dev sde, sector > 475005135 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 59375634 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 59375635 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > Apr 4 13:53:16 master kernel: Buffer I/O error on device sde1, logical > block 59375636 > Apr 4 13:53:16 master kernel: lost page write due to I/O error on sde1 > > =================================================== > "dmesg" output when switch off the LAN switch > =================================================== > iscsi: cmd 0x28 is not queued (6) > iscsi: cmd 0x28 is not queued (6) > sd 14:0:0:6: SCSI error: return code = 0x00010000 > end_request: I/O error, dev sde, sector 633227487 > sd 14:0:0:6: SCSI error: return code = 0x00010000 > sd 14:0:0:6: rejecting I/O to device being removed > end_request: I/O error, dev sde, sector 633228031 > > > > Is there any parameter in iscsi file need to set that relogin/re-establish > the session automatically whenever LAN switch comes up???? > > > > Thanks in advance. > > ==================================================================================================== > > -- > You received this message because you are subscribed to the Google Groups > "open-iscsi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/open-iscsi?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/open-iscsi?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
