On Mar 22, 2013, at 6:06 AM, Davide D'Amico <[email protected]> wrote:
> Il 22/03/13 11:00, Traffanstead, Mike ha scritto: >> May I ask why you're running ZFS on top of a RAID array? That's not >> recommended. One of the advantages of ZFS is that it balance disk >> activity across devices but when put it on top drives that at are >> already raided it loses that insight and may end up scheduling >> reads/writes that all land on the same device. The only case where >> it's okay to do this is if you mirroring individual disks (e.g. >> several RAID-1 devices) and even that's arguable. > Hi, > we tried different approaches to a /DATA partition (before trying using a ZFS > /DATAZFS partition): > > - an UFS partition (/DATA) on hardware raid10; What are details of the ufs setup? Version, softupdate , softupdate journaled, gjournal . What mount options ? > - a ZFS on hardware raid10; > - a ZFS mirror on two hardware stripes; > > The UFS filesystems performed at 400MBps without any tweak while ZFS > performed at 400MBps after tweaks. > > So I don't think that these levels of performaces are related to file system. > > Thanks, > d. > > _____________________________________________ What can you tell us about the raid card. And disks ? --- Mark saad | [email protected] _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "[email protected]"
