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A friendly minor correction - a resilver is only when a drive is replaced, the periodic checksum check is a scrub in ZFS parlance.
by karamanolev 6y ago
A friendly minor correction - a resilver is only when a drive is replaced, the periodic checksum check is a scrub in ZFS parlance.
- magicalhippo 6y agoAnd the scrub has to be initiated somehow, typically cron job, it's not automatic in ZFS. Though NAS distributions like TrueNAS/FreeNAS sets this up for you by default.
- bayindirh 6y ago> And the scrub has to be initiated somehow, typically cron job, it's not automatic in ZFS. The devices were Oracle/Sun ZFS appliances (I tortured a 7320, we liked it & bought a full-out 7420) so, maybe it was set up to scrub/resilver automatically in some cases. As I've aforementioned, we're more of a Lustre shop and retired the systems some years ago.
- bayindirh 6y ago> A friendly minor correction... Thank you. I'm no expert in ZFS TBH (We use Lustre much more) but, IIRC, when I was benchmarking the then new Sun Oracle ZFS 7320, I remember it was resilvering the disks after especially torturous loads, at night. Maybe it was specific to the appliances (Our behemoth 7420 did the same) or, something was wrong. I remember Oracle/Sun guys jokingly asking me whether I succeeded to make it resilver the disks and, hearing it did indeed resilver the disks a dozen times visibly upset them. They've only said that "Pack it up, we need to go". Fun times, it was.
- Fnoord 6y agoHmm, if you had to resilver the disks a dozen times, I would assume that is indication of a hardware failure somewhere in the device (perhaps RAM?).