On Jun 1, 2012, at 4:54 AM, Edward Ned Harvey wrote: >> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- >> boun...@opensolaris.org] On Behalf Of Richard Elling >> >>> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- >>> boun...@opensolaris.org] On Behalf Of "Antonio S. Cofiño" >>> >>> My question is, there is anyway to anticipate this "choking" situation > when a >>> disk is failing, to avoid the general failure? >> >> No. > > Yes.
:-) > But not necessarily using the setup that you are currently using - that is > not quite clear from your original email. > > If you have 4 HBA's, you want to arrange your raid such that you could > survive the complete loss of the entire HBA. This would mean you build your > pool out of a bunch of 4-disk raidz vdev's, or perhaps a bunch of 8-disk > raidz2 vdev's. > > The whole problem you're facing is that some bad disk brings down the whole > bus with it... Make your redundancy able to survive the loss of a bus. We've had luck eliminating expanders from the design, too :-) But this is also one of those cases where the failure results in a "wounded soldier" case -- not dead, but not able to keep fighting effectively. The result is a massive slowdown of the system that can be best described as a DoS condition. -- richard -- ZFS Performance and Training richard.ell...@richardelling.com +1-760-896-4422
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