| From: | Michael Schmiedgen <schmiedgen(at)gmx(dot)net> |
|---|---|
| To: | Mark Felder <feld(at)FreeBSD(dot)org>, Albert Shih <Albert(dot)Shih(at)obspm(dot)fr>, pgsql-admin(at)postgresql(dot)org, freebsd-fs(at)freebsd(dot)org, freebsd-jail(at)freebsd(dot)org |
| Subject: | Re: ZFS-FreeBSD + postgresql performance |
| Date: | 2013-10-23 20:57:57 |
| Message-ID: | 52683855.6060609@gmx.net |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-admin |
On 10/23/13 19:14, Mark Felder wrote:
> On Wed, Oct 23, 2013, at 11:25, Albert Shih wrote:
>> My question is about the performance, I known ZFS eat all memory he can
>> have (or almost), so what append when we run database like postgresql and
>> jail ? (it's also the reason of 96 Go ram).
>>
>> Sorry for cross-posting but it's about 3 differents things....
>>
>
> To my understanding the solution is to change the primarycache to
> "metadata" for any ZFS filesystem that you do not want ZFS to heavily
> cache in memory.
>
> Example:
>
> # zfs set primarycache=metadata tank/usr/local/pgsql
In addition to this it is recommended to set the recordsize
to the fixed value of 8k on dataset creation.
Michael
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