tsuraan wrote: > I posted this on the forums in June and never got any response, so I > figured I'd try again here; it looks like the lists get a good amount > of traffic. > You really should give your message a subject that indicates your question/problem. It is not unusual for people to ignore messages with no subject, unless it is a slow day.
> I have a file server with 8 SATA drives formatted with ZFS RAIDZ2. I'm > using Linux as the host because it's the only OS that I can find that > properly handled the jmicron controller on the motherboard. Under > Linux, I can get raw write speeds of 105MB/s to each of the 8 hard > drives simultaneously. Using the linux zfs implementation > (zfs-on-fuse), I can get reads of 100MB/s and writes of 250MB/s. > That's not bad, but it's pretty bad compared with the raw capability > of the drives, so I thought I'd try OpenSolaris under VirtualBox. > What else is the system doing when you are doing the test? System load can have a drastic affect on drive access times. Also, don't expect to get anywhere close to the raw speed when accessing more then one drive at the same time. > I set up the virtual image using a virtual SCSI controller, mapping > each of the raw drives to SCSI IDs 0-6 and 8 (a drive with ID 7 is > never seen by OpenSolaris). I did a zfs import to bring the pool > online, and I ran a simple dd test. My write and read speeds are under > 30 MB/s. I've tried using the virtual SATA controller (from VirtualBox > bin), but it just freezes after about 100MB of data written, so I > can't get a good assessment of the performance there. Can anybody > recommend any performance tips for IO, give any ideas of what to look > for, etc? I did notice that the .vmdk for all the raw drives says the > interface is ide. Could that be a problem? Any ideas at all would be > most appreciated. > I cold be wrong, but I believe that vbox is still using the host OS to access the drive. You also have more overhead when accessing the drives. Mikkel -- Do not meddle in the affairs of dragons, for thou art crunchy and taste good with Ketchup!
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