[ Comments below, in line ] On Tuesday 18 August 2009 at 3:02 am, Gordan Bobic penned about "Re: [vbox-users] Poor IO performance"
> > 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. > > Welcome to virtualization. If performance is an issue, you shouldn't be > virtualizing. I think you're doing reasonably well at 1/3 of host > performance. Howdy, I get about 50% I/O performance when running a `dd' test where I copy a 287MB file with a block size of 1MB. VM == pa...@data4ss-on-oreo ~/data $ dd if=plugh of=x bs=1048576 273+1 records in 273+1 records out 286660839 bytes (287 MB) copied, 3.945 s, 72.7 MB/s Host O/S ======== pa...@oreo-1005-[data]: dd if=plugh of=y bs=1048576 273+1 records in 273+1 records out 286660839 bytes (287 MB) copied, 2.00301 s, 143 MB/s -- Pablo Sanchez - Blueoak Database Engineering, Inc Ph: 819.459.1926 Fax: 760.860.5225 (US) _______________________________________________ vbox-users mailing list [email protected] http://vbox.innotek.de/mailman/listinfo/vbox-users
