According to Leif Nixon: > > > Even if we hadn't been close to a scheduled downtime, the applications > > running on most of our X4500 are fault tolerant enough that we can > > offline a machine for some time without a significant impact. > > These are dCache pools? If so, have you seen any dCache specific > issues? You symlink the control directory to a non-ZFS filesystem? > Most of the X4500 we have are indeed dCache disk pools.
We had an issue with the (incredibly) long dCache startup time due to some strange problem in Java/ZFS metadata interaction. Our solution was indeed to move the dCache metadata to a UFS filesystem on the mirrored system disks. This issue and probably a few others were mentionned during the X4500/ZFS related presentations during last HEPiX meeting in Hamburg. I remember seing you there (or someone wearing a badge with your name on it :-). Specifically, Robert Petkus's presentation on disk systems tests (with small input from me) and Martin Gasthuber's presentation on ZFS usage at DESY and IN2P3 Computing Centre (for which I provided some data). Loïc. -- | Loïc Tortay <[EMAIL PROTECTED]> - IN2P3 Computing Centre | _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
