[OpenIndiana-discuss] Slow zfs writes
Jason Matthews
jason at broken.net
Tue Feb 12 01:09:49 UTC 2013
I am going to offer to obvious advice...
How full is your pool? Zpool performance degrades as the pool fills up and
the tools don't tell you how close you are to the cliff -- you find the
cliff on your own by falling off of it. As a rule of thumb, I keep
production system less than 70% utilized.
Here is a real life example. On a 14.5TB (configured) pool, I found the
cliff with 250+GB still reported as free. The system continued to write to
the pool but throughput dismal.
Is your pool full?
j.
-----Original Message-----
From: Ram Chander [mailto:ramquick at gmail.com]
Sent: Monday, February 11, 2013 4:48 AM
To: Discussion list for OpenIndiana
Subject: [OpenIndiana-discuss] Slow zfs writes
Hi,
My OI box is expreiencing slow zfs writes ( around 30 times slower ).
iostat reports below error though pool is healthy. This is happening in
past 4 days though no change was done to system. Is the hard disks faulty ?
Please help.
# zpool status -v
root at host:~# zpool status -v
pool: test
state: ONLINE
status: The pool is formatted using a legacy on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on software that does not support
feature flags.
config:
NAME STATE READ WRITE CKSUM
test ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
c2t0d0 ONLINE 0 0 0
c2t1d0 ONLINE 0 0 0
c2t2d0 ONLINE 0 0 0
c2t3d0 ONLINE 0 0 0
c2t4d0 ONLINE 0 0 0
raidz1-1 ONLINE 0 0 0
c2t5d0 ONLINE 0 0 0
c2t6d0 ONLINE 0 0 0
c2t7d0 ONLINE 0 0 0
c2t8d0 ONLINE 0 0 0
c2t9d0 ONLINE 0 0 0
raidz1-3 ONLINE 0 0 0
c2t12d0 ONLINE 0 0 0
c2t13d0 ONLINE 0 0 0
c2t14d0 ONLINE 0 0 0
c2t15d0 ONLINE 0 0 0
c2t16d0 ONLINE 0 0 0
c2t17d0 ONLINE 0 0 0
c2t18d0 ONLINE 0 0 0
c2t19d0 ONLINE 0 0 0
c2t20d0 ONLINE 0 0 0
c2t21d0 ONLINE 0 0 0
c2t22d0 ONLINE 0 0 0
c2t23d0 ONLINE 0 0 0
raidz1-4 ONLINE 0 0 0
c2t24d0 ONLINE 0 0 0
c2t25d0 ONLINE 0 0 0
c2t26d0 ONLINE 0 0 0
c2t27d0 ONLINE 0 0 0
c2t28d0 ONLINE 0 0 0
c2t29d0 ONLINE 0 0 0
c2t30d0 ONLINE 0 0 0
raidz1-5 ONLINE 0 0 0
c2t31d0 ONLINE 0 0 0
c2t32d0 ONLINE 0 0 0
c2t33d0 ONLINE 0 0 0
c2t34d0 ONLINE 0 0 0
c2t35d0 ONLINE 0 0 0
c2t36d0 ONLINE 0 0 0
c2t37d0 ONLINE 0 0 0
raidz1-6 ONLINE 0 0 0
c2t38d0 ONLINE 0 0 0
c2t39d0 ONLINE 0 0 0
c2t40d0 ONLINE 0 0 0
c2t41d0 ONLINE 0 0 0
c2t42d0 ONLINE 0 0 0
c2t43d0 ONLINE 0 0 0
c2t44d0 ONLINE 0 0 0
spares
c5t10d0 AVAIL
c5t11d0 AVAIL
c2t45d0 AVAIL
c2t46d0 AVAIL
c2t47d0 AVAIL
# iostat -En
c4t0d0 Soft Errors: 0 Hard Errors: 5 Transport Errors: 0
Vendor: iDRAC Product: Virtual CD Revision: 0323 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 5 No Device: 0 Recoverable: 0
Illegal Request: 1 Predictive Failure Analysis: 0
c3t0d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: iDRAC Product: LCDRIVE Revision: 0323 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0 Predictive Failure Analysis: 0
c4t0d1 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Vendor: iDRAC Product: Virtual Floppy Revision: 0323 Serial No:
Size: 0.00GB <0 bytes>
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
root at host:~# fmadm faulty
--------------- ------------------------------------ --------------
---------
TIME EVENT-ID MSG-ID
SEVERITY
--------------- ------------------------------------ --------------
---------
Jan 05 08:21:09 7af1ab3c-83c2-602d-d4b9-f9040db6944a ZFS-8000-HC
Major
Host : host
Platform : PowerEdge-R810
Product_sn :
Fault class : fault.fs.zfs.io_failure_wait
Affects : zfs://pool=test
faulted but still in service
Problem in : zfs://pool=test
faulted but still in service
Description : The ZFS pool has experienced currently unrecoverable I/O
failures. Refer to
http://illumos.org/msg/ZFS-8000-HCfor
more information.
Response : No automated response will be taken.
Impact : Read and write I/Os cannot be serviced.
Action : Make sure the affected devices are connected, then run
'zpool clear'.
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