>On Wed, 2008-09-10 at 15:00 -0400, Maurice Volaski wrote: >> >On Wed, 2008-09-10 at 14:36 -0400, Maurice Volaski wrote: >> >> A disadvantage, however, is that Sun StorageTek Availability Suite >> >> (AVS), the DRBD equivalent in OpenSolaris, is much less flexible than >> >> DRBD. For example, AVS is intended to replicate in one direction, >> >> from a primary to a secondary, whereas DRBD can switch on the fly. >> >> See >> >> http://www.opensolaris.org/jive/thread.jspa?threadID=68881&tstart=30 >> >> for details on this. >> > >> >I would be curious to see production environments "switching" direction >> >on the fly at that low level... Usually some top-level brain does that >> >in context of HA fail-over and so on. >> >> By switching on the fly, I mean if the primary services are taken >> down and then brought up on the secondary, the direction of >> synchronization gets reversed. That's not possible with AVS because... >> >> >well, AVS actually does reverse synchronization and does it very good. >> >> It's a one-time operation that "re-reverses" once it completes. > >When primary is repaired you want to have it on-line and retain the >changes made on the secondary.
Not necessarily. Even when the primary is ready to go back into service, I may not want to revert to it for one reason or another. That means I am without a live mirror because AVS' realtime mirroring is only one direction, primary to secondary. -- Maurice Volaski, [EMAIL PROTECTED] Computing Support, Rose F. Kennedy Center Albert Einstein College of Medicine of Yeshiva University _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
