Date: Wed, 20 May 2015 21:57:09 -0500 From: Mahmoud Al-Qudsi <mqudsi@neosmart.net> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: freebsd-stable@freebsd.org Subject: Re: Status of NFS4.1 FS_RECLAIM in FreeBSD 10.1? Message-ID: <C6B65105-0DA8-488A-B099-A8DEC404AA22@neosmart.net> In-Reply-To: <1013279983.41809469.1432173463439.JavaMail.root@uoguelph.ca> References: <1013279983.41809469.1432173463439.JavaMail.root@uoguelph.ca>
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On May 20, 2015, at 8:57 PM, Rick Macklem <rmacklem@uoguelph.ca> wrote: > Only the global RECLAIM_COMPLETE is implemented. I'll be honest that > I don't even really understand what the "single fs reclaim_complete" > semantics are and, as such, it isn't implemented. Thanks for verifying that. > I think it is meant to be used when a file system is migrated from > one server to another (transferring the locks to the new server) or > something like that. > Migration/replication isn't supported. Maybe someday if I figure out > what the RFC expects the server to do for this case. I wasn’t clear on if this was lock reclaiming or block reclaiming. Thanks. >> I can mount and use NFSv3 shares just fine with ESXi from this same >> server, and >> can mount the same shares as NFSv4 from other clients (e.g. OS X) as >> well. >> > This is NFSv4.1 specific, so NFSv4.0 should work, I think. Or just use NFSv3. > > rick For some reason, ESXi doesn’t do ESXi 4.0, only v3 or v4.1. I am using NFS v3 for now, but unless I’m mistaken, since FreeBSD supports neither “nohide” nor “crossmnt” there is no way for a single export(/import) to cross ZFS filesystem boundaries. I am using ZFS snapshots to manage virtual machine images, each machine has its own ZFS filesystem so I can snapshot and rollback individually. But this means that under NFSv3 (so far as I can tell), each “folder” (ZFS fs) must be mounted separately on the ESXi host. I can get around exporting them each individually with the -alldirs parameter, but client-side, there does not seem to be a way of traversing ZFS filesystem mounts without explicitly mounting each and every one - a maintenance nightmare if there ever was one. The only thing I can think of would be unions for the top-level directory, but I’m very, very leery of the the nullfs/unionfs modules as they’ve been a source of system instability for us in the past (deadlocks, undetected lock inversions, etc). That and I really rather a maintenance nightmare than a hack. Would you have any other suggestions? Thanks, Mahmoud
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