Date: Sun, 5 Aug 2007 21:42:40 -0400 From: "Philip M. Gollucci" <philip@riderway.com> To: "questions@FreeBSD.org" <questions@FreeBSD.org> Subject: Unbelievably bad RAID-1 performance Message-ID: <46B67C90.3010603@riderway.com>
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while writing to the disk gstat screenshot http://people.apache.org/~pgollucci/disks.png If I move the location to '/' (da0s1a) which AFAIK is at the center of disk(smaller thus faster rpms) should be faster, performance is at least 100times worse which is the opposite I would expect. Is there anything I can do to help this out. I'm likely going to chuck the raid card in the trash and just use one disk and reply on backups which I already have going. Dell PowerEdge 1435SC Dual Intel Core2 Duo 2.4GHz 4GB RAM RAID-1 Config with 2 disks@240GB each FreeBSD 6.2-release-p5 amd64 custom kernel. mpt0: <LSILogic SAS/SATA Adapter> port 0xdc00-0xdcff mem 0xeffec000-0xeffeffff,0xefff0000-0xefffffff irq 35 at device 8.0 on pci7 mpt0: [GIANT-LOCKED] mpt0: MPI Version=1.5.12.0 mpt0: mpt_cam_event: 0x16 mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). mpt0: mpt_cam_event: 0x12 mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). mpt0: mpt_cam_event: 0x12 mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). mpt0: mpt_cam_event: 0x16 mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). mpt0: mpt_cam_event: 0xb mpt0: Unhandled Event Notify Frame. Event 0xb (ACK not required). da0 at mpt0 bus 0 target 0 lun 0 da0: <Dell VIRTUAL DISK 1028> Fixed Direct Access SCSI-5 device da0: 300.000MB/s transfers, Tagged Queueing Enabled da0: 237464MB (486326272 512 byte sectors: 255H 63S/T 30272C) ------------------------------------------------------------------------ Philip M. Gollucci (philip@riderway.com) 323.219.4708 Senior System Admin - Riderway, Inc. http://riderway.com 1024D/EC88A0BF 0DE5 C55C 6BF3 B235 2DAB B89E 1324 9B4F EC88 A0BF Work like you don't need the money, love like you'll never get hurt, and dance like nobody's watching.
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