On 09.09.08 19:32, Richard Elling wrote: > Ralf Ramge wrote: >> Richard Elling wrote: >> >>>> Yes, you're right. But sadly, in the mentioned scenario of having >>>> replaced an entire drive, the entire disk is rewritten by ZFS. >>> No, this is not true. ZFS only resilvers data. >> Okay, I see we have a communication problem here. Probably my fault, I >> should have written "the entire data and metadata". >> I made the assumption that a 1 TB drive in a X4500 may have up to 1 TB >> of data on it. Simply because nobody buys the 1 TB X4500 just to use >> 10% of the disk space, he would have bought the 250 GB, 500 GB or 750 >> GB model then. > > Actually, they do :-) Some storage vendors insist on it, to keep > performance up -- short-stroking. > > I've done several large-scale surveys of this and the average usage > is 50%. This is still a large difference in resilver times between > ZFS and SVM.
There is RFE 6722786 "resilver on mirror could reduce window of vulnerability" which is aimed to reduce this difference for mirrors. See here: http://bugs.opensolaris.org/view_bug.do?bug_id=6722786 Wbr, Victor _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
