Terrible Write preformance.
Posted on 2005-04-15
Windows Server 2003 Enterprise Edition
Supermicro p4sci Mobo
1 x 40 gig C drive (system)
6 x 250 gig on 3ware RAID controler in RAID 5 (D drive data drive)
1 x 3ware RAID controler (model 7506-8)
1 gig RAM
2.8 P4 processor
This mobo has 2 gigabit NICs although I am only using 1.
I am pretty sure that the RAID controler is in a 66 MHz PCI slot.
When writeing data to a drive the whole computer takes a preformace hit, so bad infact I cant move the mouse and all my network shares on the server cease to exist, until the write is finished. The problem is more apparent when writeing large amounts of data (obviously because of the prolonged write).
This is also seen while copying files to the server over the network. These are the speeds at which the reads and writes take place.
Copying files from the...
Server to the workstation = 30 MB/s
Workstation to the server = 9 MB/s
All this is over a gigabit connection. When copying to the server the server will slow down so severly that the network share that I am copying to will disappear and the copy will fail. After the server regains its resources the share will be available again.
Although the write speeds are pretty consistant between the RAID 5 Array and the C drive, the preformance hit only occurs when copying to the C drive (I'm sure thats because the system is not accessable because of the demand put on that drive)
Anyway I have contacted both 3ware and Supermicro and niether have been able to help me.
Any help you can provide would be very appriciated.