Karthik, The pool failmode property as implemented governs the behaviour when all the devices needed are unavailable. The default behaviour is to wait (block) until the IO can continue - perhaps by re-enabling the device(s). The behaviour you expected can be achieved by "zpool set failmode=continue <pool>", as shown in the link you indicated below.
Neil. On 10/15/08 22:38, Karthik Krishnamoorthy wrote: > Hello All, > > Summary: > ~~~~~~~~ > cp command for mirrored zfs hung when all the disks in the mirrored > pool were unavailable. > > Detailed description: > ~~~~~~~~~~~~~~~~~~~~~ > > The cp command (copy a 1GB file from nfs to zfs) hung when all the disks > in the mirrored pool (both c1t0d9 and c2t0d9) were removed physically. > > NAME STATE READ WRITE CKSUM > test ONLINE 0 0 0 > mirror ONLINE 0 0 0 > c1t0d9 ONLINE 0 0 0 > c2t0d9 ONLINE 0 0 0 > > We think if all the disks in the pool are unavailable, cp command should > fail with error (not cause hang). > > Our request: > ~~~~~~~~~~~~ > Please investigate the root cause of this issue. > > How to reproduce: > ~~~~~~~~~~~~~~~~~ > 1. create a zfs mirrored pool > 2. execute cp command from somewhere to the zfs mirrored pool. > 3. remove the both of disks physically during cp command working > = hang happen (cp command never return and we can't kill cp command) > > One engineer pointed me to this page > http://opensolaris.org/os/community/arc/caselog/2007/567/onepager/ and > indicated that if all the mirrors are removed zfs enters a hang like > state to prevent the kernel from going into a panic mode and this type > of feature would be an RFE. > > My questions are > > Are there any documentation of the "mirror" configuration of zfs that > explains what happens when the underlying > drivers detect problems in one of the mirror devices? > > It seems that the traditional views of "mirror" or "raid-2" would expect > that the > mirror would be able to proceed without interruption and that does not > seem to be this case in ZFS. > > What is the purpose of the mirror, in zfs? Is it more like an instant > backup? If so, what can the user do to recover, when there is an > IO error on one of the devices? > > > Appreciate any pointers and help, > > Thanks and regards, > Karthik > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
