zfs arc and amount of wired memory

Alexander Leidinger Alexander at Leidinger.net
Thu Feb 9 13:41:30 UTC 2012


if you are not using USB3 and a fast memory stick, it will be slower than swapping to disk.


Send via an Android device, please forgive brevity and typographic and spelling errors. 

Freddie Cash <fjwcash at gmail.com> hat geschrieben:On Wed, Feb 8, 2012 at 10:25 AM, Eugene M. Zheganin <emz at norma.perm.ru> wrote:
> On 08.02.2012 18:15, Alexander Leidinger wrote:
>> I can't remember to have seen any mention of SWAP on ZFS being safe
>> now. So if nobody can provide a reference to a place which tells that
>> the problems with SWAP on ZFS are fixed:
>>  1. do not use SWAP on ZFS
>>  2. see 1.
>>  3. check if you see the same problem without SWAP on ZFS (btw. see 1.)
> So, if a swap have to be used, and, it has to be backed up with something
> like gmirror so it won't come down with one of the disks, there's no need to
> use zfs for system.
> This makes zfs only useful in cases where you need to store something on a
> couple+ of terabytes, still having OS on ufs. Occam's razor and so on.

Or, you plug a USB stick into the back (or even inside the case as a
lot of mobos have internal USB connectors now) and use that for swap.

Freddie Cash
fjwcash at gmail.com
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