On Apr 19, 2010, at 9:50 AM, Don wrote: > Now I'm simply confused.
In one sentence, the cachefile keeps track of what is currently imported. > Do you mean one cachefile shared between the two nodes for this zpool? How, > may I ask, would this work? Each OS instance has a default cachefile. > The rpool should be in /etc/zfs/zpool.cache. Yes, this is the default for OpenSolaris distributions. > The shared pool should be in /etc/cluster/zpool.cache (or wherever you prefer > to put it) so it won't come up on system start. Correct > What I don't understand is how the second node is either a) supposed to share > the first nodes cachefile or b) create it's own without importing the pool. a) it doesn't b) it doesn't > You say this is the job of the cluster software- does ha-cluster already > handle this with their ZFS modules? Yes > I've asked this question 5 different ways and I either still haven't gotten > an answer- or still don't understand the problem. see below > Is there a way for a passive node to generate it's _own_ zpool.cache without > importing the file system. If so- how. If not- why is this unimportant? No. And this is unimportant. The bit of context missing here is the answer to the question, why do we want to keep a backup of the cache file? The answer is that the cache file contains a record of the GUID for each disk. In the event that a disk is destroyed, there are some cases where the pool can be brought online if the GUID of the destroyed disks are known. This is not a typical recovery method and has rarely been needed. Please do not confuse the discussion of the desire to keep a copy of the cachefile with the greater desire to keep a record of the GUIDs. In this context, the cachefile is a convenient record of the GUIDs. -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance Las Vegas, April 29-30, 2010 http://nexenta-vegas.eventbrite.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
