Brandon, Thank you for the explanation. It looks like I will have to share out each file system. I was trying to keep the number of shares manageable, but it sounds like that won't work.
Regards, Chris On Mar 24, 2010, at 9:36 PM, Brandon High wrote: > 2010/3/24 Chris Dunbar <cdun...@earthside.net> > I have boxed myself into a mental corner and need some help getting out. I am > confused about working with ZFS file systems. Here is a simple example of > what has me confused: Let's say I create the ZFS file system tank/nfs and > share that over NFS. Then I create the ZFS file systems tank/nfs/foo1 and > tank/nfs/foo2. I want to manage snapshots independently for foo1 and foo2, > but I would like to be able to access both from the single NFS share for > tank/nfs. Here are my questions: > > 1. Can I in fact access foo1 and foo2 through the NFS share of tank/nfs or do > I need to create separate NFS shares for each of them? > > No, but sort of yes. > > If you mount server:/nfs on another host, it will not include > server:/nfs/foo1 or server:/nfs/foo2. Some nfs clients (notably Solaris's) > will attempt to mount the foo1 & foo2 datasets automatically, so it looks > like you've exported everything under server:/nfs. Linux clients don't behave > in the same fashion, you'll have to separately mount all the exports. > > The sharenfs property will be inherited by the descendant datasets, so if you > set it on tank/nfs, tank/nfs/foo1 will have the same settings. > > 2. Is there any difference in interacting with foo1 and foo2 through the > tank/nfs share versus interacting with them directly? I don't even know if > that question makes sense, but it's at the heart of my confusion - nesting > file systems. > > There are some functions that are unavailable, such as retrieving the zfs > settings, etc. I'm not really sure about specifics. > > Depending on the client nfs version, you may not be able to manipulate acls > from clients. > > 3. If I make a snapshot of tank/nfs, does it include the data in foo1 and > foo2 or are they excluded since they are separate ZFS file systems? > > No, foo1 and foo2 are separate datasets and have completely independent > snapshots. > > You can do 'zfs snapshot -r tank/nfs' which will make a recursive snapshot. > All the datasets under tank/nfs will have a snapshot taken at the exact same > transaction. I'm guessing that's what you'd want? > > -B > > -- > Brandon High : bh...@freaks.com > eSoft SpamFilter Training Tool > Train as Spam > Blacklist for All Users > Whitelist for All Users
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