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 [EMAIL PROTECTED]:/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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