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Snapshot Status

All,

I have been using the new LVM snapshot regression test extensively over the last couple of business days.  (xfstests/068 now in CVS)

I have found that the only kernel that can reliable pass the test is an xfs cvs kernel as of today.  (Steve Lord put in a fix over the weekend that seems to be the final piece in the puzzle.)

I suggest anyone using LVM snapshots with XFS in a production environment should consider this information.

Note: if you want to run the snapshot test on your platform, the current CVS version has a couple of small typos that I described in an e-mail earlier today.  Hopefully Nathan will get those changes into CVS shortly.

Note 2: The kernel lockup listed below has not been reported before by me, but it was apparently resolved by Steve's latest fix.

===== Results of my tests

WIth no i/o load:
 Kernel 2.4.19pre4aa1with SuSE patches (i.e. XFS 1.1 based)      Succesfully ran 20 iterations
 XFS CVS Aug. 30 kernel                                                           Succesfully ran 20 iterations
 XFS CVS Sept. 2 kernel                                                            Succesfully ran 20 iterations


WIth a dd based i/o load
 Kernel 2.4.19pre4aa1with SuSE patches (i.e. XFS 1.1 based)       lvcreate locks up within 20 iterations
 XFS CVS Aug. 30 kernel                                                           Succesfully ran 20 iterations
 XFS CVS Sept. 2 kernel                                                            Succesfully ran 20 iterations


WIth a fsstress based i/o load
 Kernel 2.4.19pre4aa1with SuSE patches (i.e. XFS 1.1 based)       lvcreate locks up within 20 iterations
 XFS CVS Aug. 30 kernel                                                           Not tested
 XFS CVS Sept. 2 kernel                                                            Succesfully ran 20 iterations

WIth both a dd and a fsstress based i/o load
 Kernel 2.4.19pre4aa1with SuSE patches (i.e. XFS 1.1 based)       lvcreate locks up within 20 iterations
 XFS CVS Aug. 30 kernel                                                           Kernel locks up within 20 iterations
 XFS CVS Sept. 2 kernel                                                            Succesfully ran 20 iterations

Greg Freemyer
Internet Engineer
Deployment and Integration Specialist
Compaq ASE - Tru64 v4, v5
Compaq Master ASE - SAN Architect
The Norcross Group
www.NorcrossGroup.com