Date: Sat, 24 Jan 2009 18:25:05 -0500 (EST) From: Charles Sprickman <spork@bway.net> To: freebsd-scsi@freebsd.org Subject: 7.1 and mpt, slow writes Message-ID: <alpine.OSX.2.00.0901241819000.37588@toasty.nat.fasttrackmonkey.com>
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Hi all,
I had this one figured out in 6.x, but I'm not seeing a similar fix in
7.x.
I have a Dell Poweredge 860 with a Dell-branded LSI controller:
mpt0: <LSILogic SAS/SATA Adapter> port 0xec00-0xecff mem
0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 8.0 on pci2
mpt0: [ITHREAD]
mpt0: MPI Version=1.5.13.0
mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 )
mpt0: 1 Active Volume (2 Max)
mpt0: 2 Hidden Drive Members (10 Max)
...
mpt0:vol0(mpt0:0:0): Settings ( Hot-Plug-Spares High-Priority-ReSync )
mpt0:vol0(mpt0:0:0): Using Spare Pool: 0
mpt0:vol0(mpt0:0:0): 2 Members:
(mpt0:1:32:0): Primary Online
(mpt0:1:1:0): Secondary Online
mpt0:vol0(mpt0:0:0): RAID-1 - Optimal
mpt0:vol0(mpt0:0:0): Status ( Enabled )
(mpt0:vol0:1): Physical (mpt0:0:1:0), Pass-thru (mpt0:1:0:0)
(mpt0:vol0:1): Online
(mpt0:vol0:0): Physical (mpt0:0:32:0), Pass-thru (mpt0:1:1:0)
(mpt0:vol0:0): Online
da0 at mpt0 bus 0 target 0 lun 0
da0: <Dell VIRTUAL DISK 1028> Fixed Direct Access SCSI-5 device
da0: 300.000MB/s transfers
da0: 75340MB (154296320 512 byte sectors: 255H 63S/T 9604C)
Basic tests with dd and bonnie show that writes are much slower than
reads:
[root@uniweb /jails]# dd if=/dev/zero of=foo count=1000M
^C1293952+0 records in
1293951+0 records out
662502912 bytes transferred in 97.712971 secs (6780092 bytes/sec)
[root@uniweb /jails]# dd if=foo of=/dev/null
1293952+0 records in
1293952+0 records out
662503424 bytes transferred in 5.065705 secs (130782076 bytes/sec)
Version 1.93d ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
uniweb.bway.n 2016M 220 99 6744 2 5985 2 417 99 58007 14
245.8 8
Latency 42611us 297ms 3053ms 24821us 43190us
4987ms
Version 1.93d ------Sequential Create------ --------Random
Create--------
uniweb.bway.net -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 65 0 +++++ +++ 118 0 69 0 +++++ +++
127 0
Latency 332ms 36us 496ms 209ms 27us
2164ms
In 6.x, I was able to resolve this by enabling the write cache on the
drives via a loader tunable, "hw.mpt.enable_sata_wc". That seems to be
gone in 7.x. Is there a new way to set this? I see no mention of the wc
options at all in the mpt manpage.
Also, do we have any way to monitor/manage these cards natively yet?
Thanks,
Charles
___
Charles Sprickman
NetEng/SysAdmin
Bway.net - New York's Best Internet - www.bway.net
spork@bway.net - 212.655.9344
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