Re: RHEL 3 x86 and LSI Megaraid

[Jesse Keating <jkeating j2solutions net>]

On Thursday 23 October 2003 15:55, Matt_Domsch Dell com 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 kickstation-131 data1]# ls -alh bigfile
-rw-r--r--    1 root     root        1000M Oct 23 18:23 bigfile


[root kickstation-131 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 kickstation-131 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 kickstation-131 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)
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