Date: Thu, 05 Jan 2006 23:08:14 -0500 From: Chuck Swiger <cswiger@mac.com> To: Vivek Khera <vivek@khera.org> Cc: freebsd-stable <freebsd-stable@freebsd.org> Subject: Re: SCSI RAID card recommendation (1/2 height PCI-X U320 SCSI dual channel) Message-ID: <43BDED2E.7090803@mac.com> In-Reply-To: <E0CCDB9A-26DF-463A-8F9C-CD5924DDA046@khera.org> References: <6CADC5BD-FBF5-472E-8087-8494AD03549C@khera.org> <E0CCDB9A-26DF-463A-8F9C-CD5924DDA046@khera.org>
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Vivek Khera wrote:
[ ... ]
> The only other aac controller I have is a Dell PERC type which is god-
> awful slow, but I hear that's dell's fault not adaptec's. I don't know
> what to believe there. That card is quite stable however.
>
> Any experiences with this that anyone wishes to share?
There's an interesting thread about the AMR RAID controller used in the newer
18x0/28x0 Dells with the PERC/4 controller, and I know of enough people using
them that such improvements (by Doug Ambrisko?) will be welcomed.
If you've got the older PERC/3 AAC controller, it looks something like this:
6-pi# dmesg | grep aac
aac0: <Dell PERC 3/Di> mem 0xf0000000-0xf7ffffff irq 31 at device 2.1 on pci2
aac0: i960RX 100MHz, 118MB cache memory, optional battery present
aac0: Kernel 2.5-0, Build 2991, S/N xxxxx
aac0: Supported Options=0
aacd0: <RAID 1 (Mirror)> on aac0
aacd0: 17355MB (35544576 sectors)
Mounting root from ufs:/dev/aacd0s1a
7-pi# diskinfo -v -t aacd0
aacd0
512 # sectorsize
18198822912 # mediasize in bytes (17G)
35544576 # mediasize in sectors
2212 # Cylinders according to firmware.
255 # Heads according to firmware.
63 # Sectors according to firmware.
Seek times:
Full stroke: 250 iter in 1.344172 sec = 5.377 msec
Half stroke: 250 iter in 1.300260 sec = 5.201 msec
Quarter stroke: 500 iter in 2.705104 sec = 5.410 msec
Short forward: 400 iter in 2.605101 sec = 6.513 msec
Short backward: 400 iter in 2.157570 sec = 5.394 msec
Seq outer: 2048 iter in 0.954848 sec = 0.466 msec
Seq inner: 2048 iter in 0.952256 sec = 0.465 msec
Transfer rates:
outside: 102400 kbytes in 3.248853 sec = 31519 kbytes/sec
middle: 102400 kbytes in 3.174779 sec = 32254 kbytes/sec
inside: 102400 kbytes in 4.612511 sec = 22200 kbytes/sec
8-pi# uname -a
FreeBSD pi.codefab.com 5.4-STABLE FreeBSD 5.4-STABLE #0: Wed Nov 9 23:04:08 EST
2005 root@pi.codefab.com:/usr/obj/usr/src/sys/PI i386
...set up as a RAID-1 mirror using a pair of 18 GB, hmm, 10K RPM Seagates, IIRC?
Seems a bit slower under 5 than under 4, but not unreasonably so.
--
-Chuck
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