Second one is from fio -ioengine=libaio -direct=1 -name=test_seq_mix_rw -filename=tank -bs=8k -iodepth=32 -size=10G -readwrite=rw -rwmixread=50 Latency : target=0, window=0, percentile=100.00%, depth=1 I amended my fio commands as suggested by jjanes, Here are the outputsįirst one is based on jjanes suggestion.
#Openzfs postgres tuning recommendations full#
Vacuum full analyze didn't help either, not that I expected it to on a new copied table. I am also unsure if the reload vs restart may be the reason I don't see the gains others are talking about.Īs a side note.
Reloads shows in psql if I SHOW setting.Īt this point, I am a bit lost on what to try next. I see some guys do restarts while some documentation states it only requires to reload. Synchronous_commit = off, didn't see any performance increaseĪs a note synchronous_commit and full_page_writes I only did a Postgres config reload as this is a production site. Primarycache = all, we have large write and reads Logbias = Latency, throughput preformed worse So it seems to me the zfs is working fine, it's just an interaction with PostgreSQL that's slow. Raidz1 1.33T 5.65T 6.78K 5.71K 31.9M 191MįIO fio -ioengine=libaio -filename=tank -size=10G -time_based -name=fio -group_reporting -runtime=10 -direct=1 -sync=1 -iodepth=1 -rw=randrw -bs=1MB -numjobs=32
#Openzfs postgres tuning recommendations free#
This takes about 3 hours to complete, make sense it needs to touch every one of the 60 mil rows, however, this takes about 10 min on the test system only on SSDĬomparing the alter commands zpool iostat outputs to fio I get the following resultsĪlter command pool alloc free read write read write
To Isolate the problem I did the following, copied the 361 GB table and ensured no triggers are active, try to run the following command, original type as timestamp ALTER TABLE table_log_test ALTER COLUMN date_executed TYPE timestamptz After the move, I have seen a massive drop in performance on large write operations (Alter table types, vacuums, index creation etc.). We recently moved a db(1.2TB) cluster from mirrored SSD to ZFS pool build-up of SSD.
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