Hi Giovani,
Thanks for the reply.
Here's a bit of iostat after uncompressing a 2.4Gb RAR file that has 1 DWF file
that we use.
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
1.0 13.0 26.0 18.0 0.0 0.0 0.0 0.8 0 1 c7t1d0
2.0 5.0 77.0 12.0 2.4 1.0 343.8 142.8 100 100 c7t2d0
1.0 16.0 25.5 15.5 0.0 0.0 0.0 0.3 0 0 c7t3d0
0.0 10.0 0.0 17.0 0.0 0.0 3.2 1.2 1 1 c7t4d0
1.0 12.0 25.5 15.5 0.4 0.1 32.4 10.9 14 14 c7t5d0
1.0 15.0 25.5 18.0 0.0 0.0 0.1 0.1 0 0 c0t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 0.0 0.0 0.0 2.0 1.0 0.0 0.0 100 100 c7t2d0
1.0 0.0 0.5 0.0 0.0 0.0 0.0 0.1 0 0 c7t0d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
5.0 15.0 128.0 18.0 0.0 0.0 0.0 1.8 0 3 c7t1d0
1.0 9.0 25.5 18.0 2.0 1.8 199.7 179.4 100 100 c7t2d0
3.0 13.0 102.5 14.5 0.0 0.1 0.0 5.2 0 5 c7t3d0
3.0 11.0 102.0 16.5 0.0 0.1 2.3 4.2 1 6 c7t4d0
1.0 4.0 25.5 2.0 0.4 0.8 71.3 158.9 12 79 c7t5d0
5.0 16.0 128.5 19.0 0.0 0.1 0.1 2.6 0 5 c0t1d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 4.0 0.0 2.0 2.0 2.0 496.1 498.0 99 100 c7t2d0
0.0 0.0 0.0 0.0 0.0 1.0 0.0 0.0 0 100 c7t5d0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
7.0 0.0 204.5 0.0 0.0 0.0 0.0 0.2 0 0 c7t1d0
1.0 0.0 25.5 0.0 3.0 1.0 2961.6 1000.0 99 100 c7t2d0
8.0 0.0 282.0 0.0 0.0 0.0 0.0 0.3 0 0 c7t3d0
6.0 0.0 282.5 0.0 0.0 0.0 6.1 2.3 1 1 c7t4d0
0.0 3.0 0.0 5.0 0.5 1.0 165.4 333.3 18 100 c7t5d0
7.0 0.0 204.5 0.0 0.0 0.0 0.0 1.6 0 1 c0t1d0
2.0 2.0 89.0 12.0 0.0 0.0 3.1 6.1 1 2 c3t0d0
0.0 2.0 0.0 12.0 0.0 0.0 0.0 0.2 0 0 c3t1d0
Sometimes two or more disks are going at 100. How does one solve this issue if
its a firmware bug? I tried looking around for Western Digital Firmware for
WD10EADS but couldn't find any available.
Would adding an SSD or two help here?
Thanks,
Em
Date: Fri, 7 May 2010 14:38:25 -0300
Subject: Re: [zfs-discuss] ZFS Hard disk buffer at 100%
From: gtirl...@sysdroid.com
To: emilygrettelis...@hotmail.com
CC: zfs-discuss@opensolaris.org
On Fri, May 7, 2010 at 8:07 AM, Emily Grettel <emilygrettelis...@hotmail.com>
wrote:
Hi,
I've had my RAIDz volume working well on SNV_131 but it has come to my
attention that there has been some read issues with the drives. Previously I
thought this was a CIFS problem but I'm noticing that when transfering files or
uncompressing some fairly large 7z (1-2Gb) files (or even smaller rar -
200-300Mb) files occasionally running iostat will give the b% as 100 for a
drive or two.
That's the percent of time the disk is busy (transactions in progress) -
iostat(1M).
I have the Western Digital EADS 1TB drives (Green ones) and not the more
expensive black or enterprise drives (our sysadmins fault).
The pool in question spans 4x 1TB drives.
What exactly does this mean? Is it a controller problem disk problem or cable
problem? I've got this on commodity hardware as its only used for a small
business with 4-5 staff accessing our media server. Its using the Intel ICHR
SATA controller. I've already changed the cables, swapped out the odd drive
that exhibted this issue and the only thing I can think of is to buy a Intel or
LSI SATA card.
The scrub sessions take almost a day and a half now (previously at most
12hours!) but theres also 70% of space being used (files wise they're chunky
MPG files) or compressed artwork but there are no errors reported.
Does anyone have any ideas?
You might be maxing out your drives' I/O capacity. That could happen when ZFS
is commting the transactions to disk every 30 seconds but if %b is constantly
high you disks might not be keeping up with the performance requirements.
We've had some servers showing high asvc_t times but it turned out to be a
firmware issue in the disk controller. It was very erratic (1-2 drives out of
24 would show that).
If you look in the archives, people have sent a few averaged I/O performance
numbers that you could compare to your workload.
--
Giovanni
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