On Tuesday, 19 August 2003 at 9:56:13 +0200, Niklas Saers Mailinglistaccount wrote: > Hi all, > I was wondering if anyone can tell me about their experience of Vinum and > its performance on RAID5 systems? I've built a vinum-raid of 4 160Gb disks > that each do a dd if=/dev/zero of=/dev/adNd of about 60Mb/sec. However, > when I've set up my raid, performance drops to 6Mb/sec, and with only > three disks it drops to 4.5Mb/sec. Is this usual?
No. You should expect about ¼ the write performance of a single disk under these rather contrived circumstances. > Because with this speed I cannot run the system at all. Have you built this system for writing single sectors to a volume using dd? > Any good way of tuning the system? There are some ideas in the man page and the web site. But in general, RAID-5 isn't designed for heavy write accesses. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers
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