On 20/10/2016 23:48, Jonathan Chen wrote:
On 21 October 2016 at 11:27, Steven Hartland <kill...@multiplay.co.uk> wrote:
On 20/10/2016 22:18, Jonathan Chen wrote:
On 21 October 2016 at 09:09, Peter <p...@citylink.dinoex.sub.org> wrote:
[...]
I see this on my pgsql_tmp dirs (where Postgres stores intermediate
query data that gets too big for mem - usually lots of files) - in
normal operation these dirs are completely empty, but make heavy disk
activity (even writing!) when doing ls.
Seems normal, I dont care as long as the thing is stable. One would need
to check how ZFS stores directories and what kind of fragmentation can
happen there. Or wait for some future feature that would do
housekeeping. ;)
I'm seeing this as well with an Odoo ERP running on Postgresql. This
lag does matter to me as this is huge performance hit when running
Postgresql on ZFS, and it would be good to see this resolved.
pg_restores can make the system crawl as well.
As mentioned before could you confirm you have disable atime?
Yup, also set the blocksize to 4K.
11:46am# zfs get all irontree/postgresql
NAME PROPERTY VALUE SOURCE
irontree/postgresql type filesystem -
irontree/postgresql creation Wed Sep 23 15:07 2015 -
irontree/postgresql used 43.8G -
irontree/postgresql available 592G -
irontree/postgresql referenced 43.8G -
irontree/postgresql compressratio 1.00x -
irontree/postgresql mounted yes -
irontree/postgresql quota none default
irontree/postgresql reservation none default
irontree/postgresql recordsize 8K local
irontree/postgresql mountpoint /postgresql
inherited from irontree
irontree/postgresql sharenfs off default
irontree/postgresql checksum on default
irontree/postgresql compression off default
irontree/postgresql atime off local
irontree/postgresql devices on default
irontree/postgresql exec on default
irontree/postgresql setuid on default
irontree/postgresql readonly off default
irontree/postgresql jailed off default
irontree/postgresql snapdir hidden default
irontree/postgresql aclmode discard default
irontree/postgresql aclinherit restricted default
irontree/postgresql canmount on default
irontree/postgresql xattr off temporary
irontree/postgresql copies 1 default
irontree/postgresql version 5 -
irontree/postgresql utf8only off -
irontree/postgresql normalization none -
irontree/postgresql casesensitivity sensitive -
irontree/postgresql vscan off default
irontree/postgresql nbmand off default
irontree/postgresql sharesmb off default
irontree/postgresql refquota none default
irontree/postgresql refreservation none default
irontree/postgresql primarycache all default
irontree/postgresql secondarycache all default
irontree/postgresql usedbysnapshots 0 -
irontree/postgresql usedbydataset 43.8G -
irontree/postgresql usedbychildren 0 -
irontree/postgresql usedbyrefreservation 0 -
irontree/postgresql logbias latency default
irontree/postgresql dedup off default
irontree/postgresql mlslabel -
irontree/postgresql sync standard default
irontree/postgresql refcompressratio 1.00x -
irontree/postgresql written 43.8G -
irontree/postgresql logicalused 43.4G -
irontree/postgresql logicalreferenced 43.4G -
irontree/postgresql volmode default default
irontree/postgresql filesystem_limit none default
irontree/postgresql snapshot_limit none default
irontree/postgresql filesystem_count none default
irontree/postgresql snapshot_count none default
irontree/postgresql redundant_metadata all default
When you see the stalling what does gstat -pd and top -SHz show?
Regards
Steve
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