On Mon, November 23, 2009 12:42, Eric D. Mudama wrote: > On Mon, Nov 23 at 9:44, sundeep dhall wrote: >>All, >> >>I have a test environment with 4 internal disks and RAIDZ option. >> >>Q) How do I simulate a sudden 1-disk failure to validate that zfs / raidz >> handles things well without data errors >> >>Options considered >>1. suddenly pulling a disk out >>2. using zpool offline >> >>I think both these have issues in simulating a sudden failure > > What is more sudden than yanking a live disk out when the system is > under load? Maybe cut the non-wall end off a 120V power code, and > touch the exposed wiring to your drive's circuit board?
>From a testing point of view, the safe assumption is that pulling a drive from hot-swap is not necessarily the same thing as that drive failing while mounted. > (don't try this at home without a good fire suppression system and eye > protection) Use insulated pliers, too. > If you're really looking to shave a few milliseconds off the time to > fail, maybe build a digital toggle switch of some kind that will short > the Tx+/- pair inside your sata data cable? Or modify a driver to do fault insertion. No, I wouldn't bother with that level of testing when qualifying products for my own purchase. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
