bofh <goodb...@gmail.com> wrote: > There's something going on then. I have 7x 3TB disk at home, in > raidz3, so about 12TB usable. 2.5TB actually used. Scrubbing takes > about 2.5 hours. I had done the resilvering as well, and that did not > take 15 hours/drive. Copying 3TBs onto 2.5" SATA drives did take more > than a day, but a 2.5" drive's performance is about 1/4 of the 3.5" > drives from the limited testing I've done.
The performance of a thumper depends on whether you set it up correctly. A thumper offers 6 independent SATA concrollers that are able to do independent DMA simultanesously. For this reason, I set up each "row" for ZFS with 6 drives. $ drives for the net capacity and two parity drives. I get a sustained local read performance of 600 MB/s this way. > Additionally, if you're only replacing one drive at a time, you're > only resilvering 250GB at a time, regardless of the size of the new > drive. > > If you already have 45X 3TB drives waiting to go in, bite the bullet > and get that eSATA cage, since you want to re-do your zpools. You can > reuse it for offsite backups in the future. This is a miss-interpretation. If you have 7 raid-z2 rows with 6 drives each, you may replace up tu 7 drives at once. I did not yet test this but I am sure that this will finish in less than a day, so the upgrade may take aprox. a week. > As a side note, on my x4540, I get writes of up to 1.2 > gigabytes/second (but that's just writing zeros to an uncompressed > pool). Real performance is lower, of course. With the original drives delivered by Sun? Jörg -- EMail:jo...@schily.isdn.cs.tu-berlin.de (home) Jörg Schilling D-13353 Berlin j...@cs.tu-berlin.de (uni) joerg.schill...@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/ URL: http://cdrecord.berlios.de/private/ ftp://ftp.berlios.de/pub/schily _______________________________________________ zfs-discuss mailing list email@example.com http://mail.opensolaris.org/mailman/listinfo/zfs-discuss