NFS is slow, expecially with small files. So what I'm trying to do is: - have the NFS client run his daily work on local zfs pools, fast. - have periodic zfs incremental send of these pools on the NFS lofi files - have the NFS server access these lofi files periodically to backup them old manner (tape) Just experimenting, to have some kind of zfs incremental backup over nfs ---------------------------------------------------------------------------------- Da: Reginald Beardsley A: [email protected] Gabriele Bulfon Data: 9 luglio 2014 18.16.16 CEST Oggetto: Re: [discuss] zfs lofi file pool double mount What are you trying to do? It's not possible for the server to have RO access and the client have R/W access. The server has to have R/W to service the client requests. As for making certain clients RO and other R/W, that's provided by NFS. You can even make the NFS mountpoint RO on the server, but the physical mountpoint still has to be R/W at least for nfsd. You *could* make the physical mountpoint completely inaccessible to anything other than nfsd by setting ownership and permissions properly. You can actually do pretty much anything you can imagine using NFS maps. Folding maps based on system architecture is one of my favorites, i.e. /app/bin -/app/${ARCH}/bin, but it's not needed much now that so much of the *nix world has converged on Linux. Back during the workstation wars it was very useful. But again, what's the objective? Reg -------------------------------------------- On Wed, 7/9/14, Gabriele Bulfon via illumos-discuss wrote: Subject: [discuss] zfs lofi file pool double mount To: [email protected] Date: Wednesday, July 9, 2014, 8:44 AM Hi, as an experiment. Let's say I have a zfs fs shared as an NFS resource to another illumos client. Let's say I have created a 152GB file on this resrouce. Let's say I have added the file as a lofi dev on the NFS server, and created a 512GB zpool on it. Finally, let's say I have added the file as a lofi dev on the NFS client too. Now I can export / import the pool both from the NFS server, and the NFS client. Obviously I can't import the pool from both machines. But...what if one would "import -f -o readonly=on" and the other would import -f read/write? Would it be possible? This would let me zfs send the client pool to the lofi pool on the NFS share, while have the server be able to read the contained files. Is it safe? Gabriele. illumos-developer | Archives | Modify Your Subscription illumos-discuss | Archives | Modify Your Subscription
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