On 1/18/2011 2:46 PM, Philip Brown wrote:
My specific question is, how easily does ZFS handle*temporary* SAN disconnects, to one side of the mirror? What if the outage is only 60 seconds? 3 minutes? 10 minutes? an hour?
Depends on the multipath drivers and the failure mode. For example, if the link drops completely at the host hba connection some failover drivers will mark the path down immediately which will propagate up the stack faster than an intermittent connection or something father down stream failing.
If we have 2x1TB drives, in a simple zfs mirror.... if one side goes temporarily off line, will zfs attempt to resync **1 TB** when it comes back? Or does it have enough intelligence to say, "oh hey I know this disk..and I know [these bits] are still good, so I just need to resync [that bit]" ?
My understanding is yes though I can't find the reference for this. (I'm sure someone else will find it in short order.)
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