Date: Mon, 28 Oct 2013 09:27:42 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: <Ivailo.TANUSHEFF@raiffeisen.bg> Cc: Patrick Dung <patrick_dkt@yahoo.com.hk>, pgsql-admin@postgresql.org, owner-freebsd-fs@freebsd.org, freebsd-fs@freebsd.org, freebsd-jail@freebsd.org Subject: Re: [ADMIN] ZFS-FreeBSD + postgresql performance Message-ID: <5E70894E80E24CF5AF894DAF80DCF04E@multiplay.co.uk> References: <20131023162545.GA19794@pcjas.obspm.fr> <1382548465.32073.37624113.6AA8DB42@webmail.messagingengine.com> <52683855.6060609@gmx.net> <OF0B1DBA74.B7B14575-ONC2257C0E.001EC20A-C2257C0E.00239411@LocalDomain> <1382716422.13782.YahooMailNeo@web193504.mail.sg3.yahoo.com> <DF66E5265C9A470A8EFABA893D5BE384@multiplay.co.uk> <OFA2082B0A.0C83667D-ONC2257C12.0025E1CF-C2257C12.00260AD4@LocalDomain>
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----- Original Message -----
From: <Ivailo.TANUSHEFF@raiffeisen.bg>
>> ----- Original Message -----
>> From: "Patrick Dung" <patrick_dkt@yahoo.com.hk>
>> Sent: Friday, October 25, 2013 4:53 PM
>> Subject: Re: [ADMIN] ZFS-FreeBSD + postgresql performance
>>
>>
>> >> I would also recommend to use 4K sector size using
>> >
>> > gnop and zpool export/import.
>>
>> This will have no effect, the ashift for a pool is set at creation.
>>
>> Regards
>> Steve
>>
>
> That's the idea: to set the ashift during the creation of the pool. Never
> did that before?
>
> gnop create -S 4096 /dev/gpt/disk0
> gnop create -S 4096 /dev/gpt/disk1
> zpool create mirror /dev/gpt/disk0.nop /dev/gpt/disk1.nop
> zpool export zroot
> gnop destroy /dev/gpt/disk0.nop
> gnop destroy /dev/gpt/disk1.nop
> zpool import zroot
First if your on 10 or 11 you don't need this unless you have a disk
which is 4k but is reporting 512b and isnt in our list of quirks.
If you still need to do this you only need to do gnop create / destroy
onone disk per top level vdev so in your example thats only one disk.
Regards
Steve
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