arc-discuss doesn't have anything specifically to do with ZFS; in particular, it has nothing to do with the ZFS ARC. Just an unfortunate overlap of acronyms.
Cross-posted to zfs-discuss, where this probably belongs. > Hey all1 > > Recently I've decided to implement OpenSolaris as a > target for BackupExec. > > The server I've converted into a "Storage Appliance" > is an IBM x3650 M2 w/ ~4TB of on board storage via > ~10 local SATA drives and I'm using OpenSolaris > svn_134. I'm using a QLogic 4Gb FC HBA w/ the QLT > driver and presented an 8TB sparse volume to the host > due to dedup and compression being turned on for the > zpool. > > When writes begin, I see anywhere from 4.5GB/Min to > 5.5GB/Min and then it drops of quickly (I mean down > to 1GB/Min or less). I've already swapped out the > card, cable, and port with no results. I have since > ensured that every piece of equipment on the box had > it's firmware updated. While doing so, I installed > Windows Server 2008 to flash all the firmware (IBM > doesn't have a Solaris installer). > > While in Server 2008, I decided to just attempt a > backup via share on the 1Gbs copper connection. I saw > speeds of up to 5.5GB/Min consistently and they were > sustained throughout 3 days of testing. Today I > decided to move back to OpenSolaris with confidence. > All writes began at 5.5GB/Min and quickly dropped > off. > > In my troubleshooting efforts, I have also dropped > the fiber connection and made it an iSCSI target with > no performance gains. I have let the on board RAID > controller do the RAID portion instead of creating a > zpool of multiple disks with no performance gains. > And, I have created the target LUN using both rdsk > and dsk paths. > > I did notice today though, that there is a direct > correlation between the ARC memory usage and speed. > Using arcstat.pl, as soon as arcsz hits 1G (half of c > column [commit?]), my throughput hits the floor (i.e. > 600MB/Min or less). I can't figure it out. I tried > every configuration possible. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
