Date: Tue, 11 May 2004 22:37:30 +0200 From: Jens Schweikhardt <schweikh@schweikhardt.net> To: freebsd-scsi@freebsd.org Subject: 2120S Stripe - abysmal performance Message-ID: <20040511203730.GB2256@schweikhardt.net>
next in thread | raw e-mail | index | archive | help
hello, world\n I hoped that my new Adaptec 2120S U320 RAID in my new Supermicro P4SCT board with 64bit/66MHz PCI would turn my disk IO into a desktop blitz, but the opposite has happened. While my old ASUS A7N8X with vinum would read 100MB/s from 2 Fujitsu MAP3367 connected to an 29160, I get only 29MB/sec from the stripe built with the 2120S (as measured with dd to /dev/null). What I have done so far: o have reset the 2120S config to factory defaults. o set the transfer speed to U160 and disabled "packetized" because I could not low level format the drives otherwise. Until that point I had a lot of trouble even getting the 2120S to boot its controller kernel. Effect has been seemingly endless (5min) twirling baton. o low level formatted both MAPs, initialized them and then built the stripe with 64kb stripe size. o I have enabled caching in both directions. The dmesg says schweikh@hal9000:~ $ dmesg|grep aac aac0: <Adaptec SCSI RAID 2120S> mem 0xe8000000-0xebffffff irq 9 at device 1.0 on pci3 aac0: Reserved 0x4000000 bytes for rid 0x10 type 3 at 0xe8000000 aac0: [FAST] aac0: i960RX 100MHz, 48MB cache memory, optional battery present aac0: Kernel 4.0-0, Build 6011, S/N ba12c0 aac0: Supported Options=1f7e<CLUSTERS,WCACHE,DATA64,HOSTTIME,RAID50,WINDOW4GB,SOFTERR,NORECOND,SGMAP64,ALARM,NONDASD> aacd0: <RAID 0 (Stripe)> on aac0 aacd0: 69997MB (143354880 sectors) Any enlightenment on how to improve disk io greatly appreciated. Regards, Jens -- Jens Schweikhardt http://www.schweikhardt.net/ SIGSIG -- signature too long (core dumped)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20040511203730.GB2256>