Date: Thu, 8 Jun 2000 11:20:53 -0700 (PDT) From: cwilkes@singingfish.com To: freebsd-gnats-submit@FreeBSD.org Subject: misc/19129: AMI Raid Express 200 card extremely slow ( < 6MB/s) Message-ID: <20000608182053.640E337BB68@hub.freebsd.org>
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>Number: 19129 >Category: misc >Synopsis: AMI Raid Express 200 card extremely slow ( < 6MB/s) >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Jun 08 11:30:00 PDT 2000 >Closed-Date: >Last-Modified: >Originator: Chris Wilkes >Release: 4.0 >Organization: >Environment: FreeBSD octopus 4.0-STABLE FreeBSD 4.0-STABLE #0: Sun May 28 11:04:59 GMT 2000 >Description: File server with an AMI MegaRaid Express 200 card attached to a disk enclosure with 8 9G LVD SCSI2 drives, for a total of ~60G of RAID5 storage. Disk writes are extremely slow on it, around 6MB/s. Called AMI and they suggested moving from Linux to FreeBSD. Did that and I still see the same (bad) performance. Speed (MB/s) Description 17.1 internal SCSI -> other internal SCSI 16.5 raid -> internal scsi 6.05 internal scsi -> raid 4.10 raid -> raid The drives are rated at 20MB/s, I'm really happy with the 17.1MB/s I'm seeing for local to local. I was expecting a huge gain up to about the 80MB/s max spec for scsi-2, but instead writes are 1/3 the speed. >How-To-Repeat: Reformated drives after the system became unstable and core dumped on an fsck. Still the same performance numbers. >Fix: >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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