RHEL 3 x86 and LSI Megaraid 2003-10-23 - By Jesse Keating
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On Thursday 23 October 2003 15:55, Matt_Domsch@(protected) wrote:
> Many people have reported improved performance with the megaraid2
> driver. However, it has had less overall exposure in production
> environments than the megaraid(1) driver has. Both are provided for
> your choice.
>
> To switch, change megaraid to megaraid2 in /etc/modules.conf, remake
> your initrd, and reboot.
We 've tried the megaraid2, here is the results:
[root@(protected) data1]# ls -alh bigfile
-rw-r--r-- 1 root root 1000M Oct 23 18:23 bigfile
[root@(protected) data1]# time dd if=bigfile of=secondfile
2048000+0 records in
2048000+0 records out
real 1m1.807s
user 0m1.130s
sys 0m26.020s
Thats only ~16M/s, even worse than the megaraid module. This is really
quite pathetic. Why would there be such a performance drop between
RHL9 and RHEL 3?
[root@(protected) data1]# cat /proc/megaraid/hba0/config
v2.00.5 (Release Date: Thu Apr 24 14:06:55 EDT 2003)
MegaRAID SCSI 320-2
Controller Type: 438/466/467/471/493/518/520/531/532
Controller Supports 40 Logical Drives
Controller capable of 64-bit memory addressing
Controller using 64-bit memory addressing
Base = f8841000, Irq = 54, Logical Drives = 3, Channels = 2
Version =1L26:G112, DRAM = 64Mb
Controller Queue Depth = 254, Driver Queue Depth = 126
support_ext_cdb = 1
support_random_del = 0
boot_ldrv_enabled = 1
boot_ldrv = 0
boot_pdrv_enabled = 0
boot_pdrv_ch = 0
boot_pdrv_tgt = 0
quiescent = 0
has_cluster = 0
Module Parameters:
max_cmd_per_lun = 63
max_sectors_per_io = 128
[root@(protected) data1]# cat /proc/megaraid/hba0/raiddrives-0-9
Logical drive: 0:, state: optimal, check-consistency in progress
Span depth: 1, RAID level: 1, Stripe size: 64, Row size: 2
Read Policy: No read ahead, Write Policy: Write thru, Cache Policy:
Direct IO
Logical drive: 1:, state: optimal, check-consistency in progress
Span depth: 1, RAID level: 1, Stripe size: 64, Row size: 2
Read Policy: No read ahead, Write Policy: Write thru, Cache Policy:
Direct IO
Logical drive: 2:, state: optimal
Span depth: 1, RAID level: 1, Stripe size: 64, Row size: 2
Read Policy: No read ahead, Write Policy: Write thru, Cache Policy:
Direct IO
--
Jesse Keating RHCE MCSE (geek.j2solutions.net)
Fedora Legacy Team (www.fedora.us/wiki/FedoraLegacy)
Mondo DevTeam (www.mondorescue.org)
GPG Public Key (geek.j2solutions.net/jkeating.j2solutions.pub)
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