How to correctly configure linux for hyper-v with iSCSI?

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kreativf2012-07-17 22:30:50

linux

kreativf, 2012-07-17 22:30:50

Hello Khabrovites,
at work we are slowly moving linux machines from hardware to hyper-v datacenter edition in which all virtual machines are on iSCSI. There are no problems in normal mode.
Problems begin when iSCSI is cut off for 15 seconds - all linux servers fall into a coma, often breaking the file system (which, unfortunately, is XFS). In the same situation, windows servers do not experience any problems.
I have already tried to increase the timeout for disks in /sys/block/sd*/device/timeout, I did not notice any improvement. Help with advice: how to properly configure linux in this situation and which file system to choose so that it does not break so easily and data loss is minimal?

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amarao, 2012-07-18
@amarao

The timeout in ISCSI is controlled by the initiator (actually, he counts this timeout) - so you have to turn around in the Windows area.
Linux has its own timeout before the start of pornography in dmesg (120s), as far as I know, it cannot be changed (you can only turn it off). How paravirtualized hyper-v disk drivers behave in such conditions is a separate issue.