On Sat, 19 Jun 2010, oizs wrote:
Date: Sat, 19 Jun 2010 02:27:05 +0200
From: oizs <o...@freemail.hu>
To: freebsd-current@freebsd.org
Subject: Re: Dell Perc 5/i Performance issues
Im using the Samsung F3 disks, which can do 140MB/s sequentially. I have
tried different raids raid0 will do just as bad as raid5. I even tried one
disk which performed as expected 100MB/s+ reads and writes so I'm not sure
anymore what could be the problem. Maybe the controller hates samsung disks?
I have a 8-disk Samsung F1/F3 mixed setup under FreeBSD-current:
(fs)(root) mfiutil show drives
mfi0 Physical Drives:
( 932G) ONLINE <SAMSUNG HD103UJ 1118 serial=S13PJDWS500394> SATA slot 0
( 932G) ONLINE <SAMSUNG HD103UJ 1118 serial=S13PJDWS500033> SATA slot 1
( 932G) ONLINE <SAMSUNG HD103UJ 1113 serial=S13PJDWQC28106> SATA slot 2
( 932G) ONLINE <SAMSUNG HD103UJ 1113 serial=S13PJDWQC28108> SATA slot 3
( 932G) ONLINE <SAMSUNG HD103UJ 1104 serial=S13PJ1EPB00232> SATA slot 4
( 932G) ONLINE <ST31000340AS SD1A serial=9QJ18R8B> SATA slot 5
( 932G) ONLINE <SAMSUNG HD103UJ 1104 serial=S13PJ1EPB00066> SATA slot 6
( 932G) ONLINE <SAMSUNG HD103UJ 1104 serial=S13PJ1EPB00602> SATA slot 7
The disks are organized as JBOD disks.
Later on they form one ZFS pool:
config:
NAME STATE READ WRITE CKSUM
x ONLINE 0 0 0
mirror ONLINE 0 0 0
mfid0p4 ONLINE 0 0 0
mfid1p4 ONLINE 0 0 0
mirror ONLINE 0 0 0
mfid2p4 ONLINE 0 0 0
mfid3p4 ONLINE 0 0 0
mirror ONLINE 0 0 0
mfid4p4 ONLINE 0 0 0
mfid5p4 ONLINE 0 0 0
mirror ONLINE 0 0 0
mfid6p4 ONLINE 0 0 0
mfid7p4 ONLINE 0 0 0
ada0p3 ONLINE 0 0 0
(ada0 is there because mfid6 had some unreadable blocks lately)
I get ~370MiB/s writing performance using `iozone -s10g -r1m`.
While my samsung disks are problematic in the area of reliability
(I get occasional parity mismatches or read errors),
performance is good.
Have you enabled the disk caches as well?
Something like:
MegaCli -LdSetProp Cached -LALL -a0
MegaCli -LdSetProp NORA -LALL -a0
MegaCli -LdSetProp WB -LALL -a0
MegaCli -LdSetProp -EnDskCache -LALL -a0
(Only if having a USV of course)
Dunno if there is a mfiutil equivalent though.
Bye/2
---
Michael Reifenberger
mich...@reifenberger.com
http://www.Reifenberger.com
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