Date: Mon, 26 Nov 2007 14:56:50 +0100 From: Gergely CZUCZY <phoemix@harmless.hu> To: freebsd-fs@freebsd.org Subject: mysql on ZFS hangs Message-ID: <20071126135650.GA97352@harmless.hu>
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Hello,
I'm trying to test a MySQL on ZFS setup, and I'm having some
troubles. At first I've copied all the mysql data files from the
UFS filesystem to the ZFS one, started mysqld and launched sysbench
at it.
On the UFS mysql was using around 100-180% CPU and did the benchmark
tasks pretty quick (in 60-120 seconds), and now it just stands there
for at least 10 minutes.
In top I see mysql in zfs state:
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
6244 mysql 3 45 0 2071M 202M zfs:(& 1 0:47 0.98% mysqld
In gstat I see the ZFS is reading all both disks in the zmirror like
a madman, but mysql pretty does nothing it seems. mysqladmin says it
has around 23qps while on UFS it used to report 6-800qps.
vmstats shows if the system weren't on load entirely:
r b w avm fre flt re pi po fr sr ad2 da0 in sy cs us=
sy id
0 0 0 2242452 3224164 180 0 0 0 2862 0 0 0 407 1097 3299 =
0 5 95
FreeBSD sees 6G memory in this box (i've got 14G in it, I haven't had
the time to check yet why it doesn't see the rest. it used to see all the
memory).
FreeBSD sqltest.in.publishing.hu 7.0-BETA2 FreeBSD 7.0-BETA2 #3: Mon Nov 5=
10:49:48 CET 2007 toor@sqltest.in.publishing.hu:/usr/obj/usr/src/sys/S=
QLTEST amd64
mysql-server-5.0.45_1 Multithreaded SQL database (server)
pool: zm
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
zm ONLINE 0 0 0
mirror ONLINE 0 0 0
da1 ONLINE 0 0 0
da2 ONLINE 0 0 0
errors: No known data errors
Filesystem Size Used Avail Capacity Mounted on
zm 40G 128K 40G 0% /zm
zm/qemu 40G 128K 40G 0% /zm/qemu
zm/mysql 42G 2.0G 40G 5% /zm/mysql
/zm/mysql 42G 2.0G 40G 5% /var/db/mysql
(yes, i'm using it through a nullmount)
In mysql I'm using myisam (no chance for innodb). I think this behaviour
is quite abnormal.
Did anybody met this issue, is this known? Where should I start digging
around to solve this (tried google, not much help)?
Where can be the bottleneck that gives this whole thing? What have I done
wrong during the setup?
I need a bit of help to make this scenario work...
Sincerely,
Gergely Czuczy
mailto: gergely.czuczy@harmless.hu
--=20
Weenies test. Geniuses solve problems that arise.
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