Thanks Reginald, your idea is much simpler than mine using lofi! It's what I need :) Sometimes we get lost in complicated stuff :D Thanks so much! Gabriele. ---------------------------------------------------------------------------------- Da: Reginald Beardsley via illumos-discuss A: [email protected] Gabriele Bulfon Data: 10 luglio 2014 22.50.43 CEST Oggetto: Re: [discuss] zfs lofi file pool double mount I concur with the assessment that tape is senseless at present. Drives and media cost too much. I mount my backup system via NFS and do a zfs incremental send to backup the client. I did this primarily because it was easy to get correct and I don't need much. As I recall I observed gigabit wire speed performance doing this. You could then do a zfs receive to unpack the incremental. I'm not running a normal production shop, so I don't bother. I rely on zfs on the client and the server to take care of things. I copy the incremental blobs to a USB drive to store offsite. USB disk is under $0.05/GB. I'm not aware of any tape that is that cheap available in 3 TB unit sizes. In summary consider this: NFS mount a scratch space on the client zfs send incrementals to the NFS mounted scratch space after that completes zfs receive the incremental to unpack on the backup system delete the zfs send blob If you lose the client filesystem, just NFS export the backup to the client until you can replace the hardware. The NFS traffic for this scenario is large files. All the rest is local to the server or client. If that doesn't provide adequate performance I think there's some other problem that you need to look into. Reg -------------------------------------------- On Thu, 7/10/14, Gabriele Bulfon via illumos-discuss wrote: Subject: Re: [discuss] zfs lofi file pool double mount To: "Reginald Beardsley" , [email protected] Date: Thursday, July 10, 2014, 2:09 AM 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 illumos-discuss | Archives | Modify Your Subscription ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175541-02f10c6f Modify Your Subscription: https://www.listbox.com/member/?&id;secret=21175541-29e3e0ee Powered by Listbox: http://www.listbox.com
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