On 9/7/06, Torrey McMahon <[EMAIL PROTECTED]> wrote:
Nicolas Dorfsman wrote: >> The hard part is getting a set of simple >> requirements. As you go into >> more complex data center environments you get hit >> with older Solaris >> revs, other OSs, SOX compliance issues, etc. etc. >> etc. The world where >> most of us seem to be playing with ZFS is on the >> lower end of the >> complexity scale. Sure, throw your desktop some fast >> SATA drives. No >> problem. Oh wait, you've got ten Oracle DBs on three >> E25Ks that need to >> be backed up every other blue moon ... >> > > Another fact is CPU use. > > Does anybody really know what will be effects of intensive CPU workload on ZFS perfs, and effects of ZFS RAID CPU compute on intensive CPU workload ? >
with ZFS I have found that memory is a much greater limitation, even my dual 300mhz u2 has no problem filling 2x 20MB/s scsi channels, even with compression enabled, using raidz and 10k rpm 9GB drives, thanks to its 2GB of ram it does great at everything I throw at it. On the other hand my blade 1500 ram 512MB with 3x 18GB 10k rpm drives using 2x 40MB/s scsi channels , os is on a 80GB ide drive, has problems interactively because as soon as you push zfs hard it hogs all the ram and may take 5 or 10 seconds to get response on xterms while the machine clears out ram and loads its applications/data back into ram.
James Dickens uadmin.blogspot.com
> I heard a story about a customer complaining about his higend server performances; when a guy came on site...and discover beautiful SVM RAID-5 volumes, the solution was almost found. > Raid calculations take CPU time but I haven't seen numbers on ZFS usage. SVM is known for using a fair bit of CPU when performing R5 calculations and I'm sure other OS have the same issue. EMC used to go around saying that offloading raid calculations to their storage arrays would increase application performance because you would free up CPU time to do other stuff. The "EMC effect" is how they used to market it. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
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