Red Hat Bugzilla – Bug 1011708
cannot mount iscsi partition after relogin
Last modified: 2013-09-25 14:07:28 EDT
Description of problem:
mount of iscsi partition not possible after relogin
Version-Release number of selected component (if applicable):
use Netgear ReadyNAS 102 as target
Steps to Reproduce:
1. iscsiadm -m discovery -t sendtargets -p 192.168.xx.yy
2. iscsiadm -m node -l
3. mount /dev/mapper/vol01-part01 /media/part01
4. umount /media/part01
5. iscsiadm -m node -u
6. iscsiadm -m node -l
7. mount /dev/mapper/vol01-part01 /media/part01
mount: /dev/mapper/vol01-part01: can't read superblock
This should work (at least this is what I would expect).
The behaviour is independent whether I use chap login or not.
The correct mount behaviour works again after rebooting the machine.
"systemctl restart iscsid.service" does not help.
Created attachment 802514 [details]
I don't think the problem here is with the iSCSI session, but with whatever device mapper use you have going on. Are you using LVM on the iSCSI disk? I'm not sure how LVM on hotplug storage is handled, setting it up as a multipath disk may be one option for dealing with the fact that iSCSI session IDs and the SCSI host number associated with it will change when you log out and back in.
You can fix the mapping by disabling the existing one over the old disk ID with vgchange, then the mapping over the "new" disk won't have a conflicting name and will work (either when it's added if you disable before loging in, or by activating it manually)
vgchange -an vol01 part01
vgchange -ay vol01 part01
Cool. This is working.
vgchange -an vol01
vgchange -ay vol01
does it for all partitons at once.