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Hi Benjamin,
if you're using compression, forget about that. You need to synchronize the ashift value to the
internal rowsize of you SSD, that's it. Make sure your SSD doesn't lie to you regarding writing
blocks and their respective order. In that case you might even choose to set sync=disabled. Also,
set atime=off and relatime=on. For faster snapshot transfers, you might like to set the checksum
algo to SHA256.
As always, put zfs.conf into /etc/modprobe.d with
options spl spl_kmem_cache_slab_limit=16384
options zfs zfs_arc_max=8589934592
you might want to adjust the zfs_arc_max value to your liking. Don't set it to more than 1/3 of
your RAM, just saying.
I running above configuration in >30 servers atm in production, about 10 in test/dev environments,
speed is awesome. No data loss so far, depite quite some brown/blackouts already.
I'm using Ubuntu LTS (precise/trusty) with newest HWE, btw.
hope that helps,
Patric
Benjamin Smith schrieb am 29.09.2015 um 22:08:
> On Tuesday, September 29, 2015 10:35:28 AM John R Pierce wrote:
>> On 9/29/2015 10:01 AM, Benjamin Smith wrote:
>>> Does anybody here have any recommendations for using PostgreSQL 9.4 (latest) with ZFS?
>>
>> For databases, I've always used mirrored pools, not raidz*.
>
>
>> put pgdata in its own zfs file system in your zpool. on that dedicated zfs, set the
>> blocksize to 8k.
>
> Based on my reading here, that would be -o ashift=13 ?
> HowDoesZFSonLinuxHandleAdvacedFormatDrives
>
> EG: 2^13 = 8192
>
>
>
>
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