ZFS Performance Severely Degraded

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ZFS Performance Severely Degraded

Post by ndd » Sun Mar 31, 2013 4:31 am

Hey, I've been using ZFS for over a year since, and never had any problems. I have 4 x 4TB disks that are hardware raided into RAID5 and seen as a large 12 GB disks which I then created a ZFS drive.

My drive works great, but I have noticed that performance is now severely degraded for writes, and it has been getting worse over the past few months. I don't do a lot of read/writes/delete and rewrites; the drive is mainly used to archive video materials.

Is this a known feature overtime with ZFS drives, or with drives that are getting near their capacity (I only have aroud 860 GB left on the 12TB drive)

What can I do to investigate further or to reset the drive back to it previous happy performance.

Thanks in advance,
Nick
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Re: ZFS Performance Severely Degraded

Post by grahamperrin » Sun Mar 31, 2013 5:55 am

ndd wrote:… 860 GB left on the 12TB drive …


I should recommend a threshold of eighty percent full (twenty percent free). Beyond that may be a point at which performance will "suck"; where that point lies will vary from one use case to another.

Here in the forum we have a few other topics/posts with performance in the subject line
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