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Seamus Abshere
Asked: 2014-06-27 14:23:35 +0800 CST

Does hot spare limit write speed in ZFS?

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Let's say I have a ZFS pool with a fast SSD and I want to add a magnetic hot spare.

Will the pool slow down to the hot spare's speed?

zfs

2 Answers

  1. Best Answer

    Yep, totally.

    It's not worth having dissimilar disks in the same data pool. I wouldn't even mix and match SATA and SAS disks as data drives in a single pool. You should stick with a like-model SSD if you want to have a hot-spare. I'd recommend using it as a cold-spare, assuming hot-pluggable disks, though.

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  2. No, unless it gets used. You can try this and everything is fast and smooth until a drive breaks in the main pool, then you're back to slow land (resilver can be snappy though, if you can avoid fragmentation).

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