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update SWAP with caution infromation

George Melikov 2019-02-24 19:07:35 +03:00
parent 593dbf1e20
commit 119107eaa4
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FAQ.md

@ -317,6 +317,8 @@ Adding the `discard` option for the mounted ZVOL in `\etc\fstab` effectively ena
You may use a zvol as a swap device but you'll need to configure it appropriately. You may use a zvol as a swap device but you'll need to configure it appropriately.
**CAUTION:** for now swap on zvol may lead to deadlock, in this case please send your logs [here](https://github.com/zfsonlinux/zfs/issues/7734).
* Set the volume block size to match your systems page size. This tuning prevents ZFS from having to perform read-modify-write options on a larger block while the system is already low on memory. * Set the volume block size to match your systems page size. This tuning prevents ZFS from having to perform read-modify-write options on a larger block while the system is already low on memory.
* Set the `logbias=throughput` and `sync=always` properties. Data written to the volume will be flushed immediately to disk freeing up memory as quickly as possible. * Set the `logbias=throughput` and `sync=always` properties. Data written to the volume will be flushed immediately to disk freeing up memory as quickly as possible.
* Set `primarycache=metadata` to avoid keeping swap data in RAM via the ARC. * Set `primarycache=metadata` to avoid keeping swap data in RAM via the ARC.