Date: Mon, 28 Apr 2014 22:17:27 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: freebsd-scsi@freebsd.org Subject: New iSCSI Stack in 10.x - Prevent hangs on a dead target? Message-ID: <FB27958FDF06CC60D0AC9611@study64.tdx.co.uk>
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Hi, I've been setting up iSCSI with a couple of 10.x boxes recently (using the new iscsictl / ctld et'al). This seems to work well - but if I connect to a remote iSCSI target - and that host 'dies' I/O on the local /dev/daX device for that dead target just halts - for what seems to be 'indefinitely'. In /var/log/messages - I can see the system trying to reconnect (to the dead host) - but I can't see sign (or way of telling it) it to 'give up' and move on after some timeout. e.g. I have a bunch of iSCSI disks in use with ZFS - this works fine until the remote node dies (which takes half the disks with it). ZFS just halts all I/O then on the pool - until I do, e.g. 'iscsictl -R -p dead-host-ip'. Is there any way of setting this on either the initiator (or the target) - it looks like something like iSCSI Time2Retain might cover it - but I can't find anywhere to set that, or anything similar... Thanks, -Karl
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