On 9/18/06, Richard Elling - PAE <[EMAIL PROTECTED]> wrote:
Interestingly, the operation may succeed and yet we will get an error which recommends replacing the drive. For example, if the failure prediction threshold is exceeded. You might also want to replace the drive when there are no spare defect sectors available. Life would be easier if they really did simply die.
For one thing, people wouldn't be interested in doing ditto-block data! So, with ditto-block data, you survive any single-block failure, and "most" double-block failures, etc. What it doesn't lend itself to is simple computation of simple answers :-). In theory, and with an infinite budget, I'd approach this analagously to cpu architecture design based on large volumes of instruction trace data. If I had a large volume of disk operation traces with the hardware failures indicated, I could run this against the ZFS simulator and see what strategies produced the most robust single-disk results. -- David Dyer-Bennet, <mailto:[EMAIL PROTECTED]>, <http://www.dd-b.net/dd-b/> RKBA: <http://www.dd-b.net/carry/> Pics: <http://www.dd-b.net/dd-b/SnapshotAlbum/> Dragaera/Steven Brust: <http://dragaera.info/> _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
