Tiraen wrote:
Well, by itself, is not a problem. But in that case, if there is a situation like this:
1) Install KVM virtual machine (eg, FreeBSD)
2) Download and unzip from Internet ports (IO load and as a result cashe zfs)
3) Set the few ports + updated world
4) Get some amount of data in the cache.
5) A server, for example, a total of 8 GB of RAM.

- Do I understand correctly that in such cases requires a separate drive in zfspool storage cache?


No, the KVM will have it's own ZFS volume, but the ZFS ARC (cache) is shared between all volumes and filesystems in the pool.

- How long will he be released from memory?


ZFS will release memory when it is required elsewhere. ZFS is designed to use what on most systems is wasted memory :)

--
Ian.



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