On 3/22/2003 at 2:17 PM Bruce Campbell wrote: |Some more test results: | |22 Mar 2003 - test with RAID 5 with 4 * WD 200GB with Write Cache disabled
|*succeeded*. Write Cache can be disabled through the 3ware BIOS, or the |3ware |web management tool. Raw write performance to the array dropped from |30000KBytes/Second to 4500KBytes/Second, however this did not impact the |test |significantly, as the test involved copying data via an NFS mount on a 100 |MBit/second network. The effective speed of the NFS copy dropped from |around |5000 KBytes/Second to about 4500 KBytes/Second with Write Cache disabled. | |Thread here: | |http://oss.sgi.com/projects/xfs/mail_archive/200211/msg00056.html | |suggests firmware/driver mismatches can cause trouble, and someone |else who had trouble found turning off write cache fixed it. | | |All my info on this problem being kept here: | |http://www.freebsd.uwaterloo.ca/twiki/bin/view/Freebsd/BackupServerProblem ============= Thanks for your follow-up, but I'd caution you regarding the serendipitous "it's working if I do this" aspect of your discovery. Those "fixes" have a nasty habit of disappearing when something else changes in the system.... I have switched over to RHLinux for the server using the 3Ware card, which is ironic because I left RHLinux when I switched to FreeBSD a year or so ago. :-) I'd much prefer to run my RAID under FreeBSD, but I prefer to use supported hardware even more. The 3Ware card is a high-end, high-performance IDE RAID card; as such, I am rather surprised that it is not properly supported under FreeBSD..... n To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-questions" in the body of the message
