>>> <[email protected]> 21.04.2020, 17:20 >>>Wondering myself.> On Apr 21, 2020, at 2:31 AM, Gionatan Danti <[email protected]> wrote:> > > [reposting, as the previous one seems to be lost]> > Hi all,> I have a question regarding udev events when using iscsi disks.> > By using "udevadm monitor" I can see that events are generated when I login and logout from an iscsi portal/resource, creating/destroying the relative links under /dev/So running “udevadm monitor” on the initiator, you can see when a block device becomes available locally. > > However, I can not see anything when the remote machine simple dies/reboots/disconnects: while "dmesg" shows the iscsi timeout expiring, I don't see anything about a removed disk (and the links under /dev/ remains unaltered, indeed). At the same time, when the remote machine and disk become available again, no reconnection events happen.As someone who has had an inordinate amount of experience with the iSCSi connection breaking ( power outage, Network switch dies, wrong ethernet cable pulled, the target server machine hardware crashes, ...) in the middle of production, the more info the better. Udev event triggers would help. I wonder exactly how XenServer handles this as it itself seemed more resilient. XenServer host initiators do something correct to recover and wonder how that compares to the normal iSCSi initiator. But unfortunately, XenServer LVM-over-iSCSi does not pass the message along to its Linux virtual drives and VMs in the same way as Windows VMs. When the target drives became available again, MS Windows virtual machines would gracefully recover on their own. All Linux VM filesystems went read only and those VM machines required forceful rebooting. mount remount would not work. > > I can read here that, years ago, a patch was in progress to give better integration with udev when a device disconnects/reconnects. Did the patch got merged? Or does the one I described above remain the expected behavior? Can be changed?> > Thanks.> -- > 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 view this discussion on the web visit https://groups.google.com/d/msgid/open-iscsi/13d4c963-b633-4672-97d9-dd41eec5fb5b%40googlegroups.com.-- 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] view this discussion on the web visit https://groups.google.com/d/msgid/open-iscsi/9D54680A-F97E-4465-BA6C-566562C5DC91%40eyeconsultantspc.com.
-- 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 view this discussion on the web visit https://groups.google.com/d/msgid/open-iscsi/5E9F80B2020000A10003875F%40gwsmtp.uni-regensburg.de.
