Re: [pve-devel] ZFSPlugin snapshot question
Earlier you seemed to imply that the ZFS/iet plugin works with targetcli - is that the case? I don't think so. ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
Yes, I will look in to this this weekend. Forgot to mention. Since snapshots by nature is read-only you have to set option wp=true to have iscsi properly advertise read-only to the mount util. I think Linux will make some internal optimization given it knows writes is not supported. Just thought a bit more about that, and maybe we can handle this by just creating a clone? I just committed some changes for the current LXC snapshot backup code: https://git.proxmox.com/?p=pve-container.git;a=commitdiff;h=4ca61ce824c9f5cc46c938e01d82f985eeac1f67 It works like this: 1.) create snapshot # pct snapshot VMID vzdump 2.) mount snapshots read-only 3.) create tar archive 4.) destroy snapshot # pct delsnapshot VMID vzdump This only works if we have read-only access to storage snapshots, which is a problem with the current ZFSPlugin. Another approach would be: 1.) create a clone 2.) backup cloned VM with 'stop' mode That way we do not even need to implement 'snapshot' backups ;-) Any comments about that idea? ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
On August 28, 2015 at 12:19 PM datanom.net m...@datanom.net wrote: On 2015-08-28 10:25, Dietmar Maurer wrote: Another approach would be: 1.) create a clone 2.) backup cloned VM with 'stop' mode That way we do not even need to implement 'snapshot' backups ;-) Any comments about that idea? Will creating a clone instead of a snapshot not take considerably longer compared to a snapshot? Yes, i guess so. It also has other problems, because not all storage type supports cloning from snapshots ... So it was an interesting idea, but does not really solve all problems :-/ ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
On 2015-08-28 10:25, Dietmar Maurer wrote: Another approach would be: 1.) create a clone 2.) backup cloned VM with 'stop' mode That way we do not even need to implement 'snapshot' backups ;-) Any comments about that idea? Will creating a clone instead of a snapshot not take considerably longer compared to a snapshot? -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael at rasmussen dot cc http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xD3C9A00E mir at datanom dot net http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE501F51C mir at miras dot org http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE3E80917 -- This mail was virus scanned and spam checked before delivery. This mail is also DKIM signed. See header dkim-signature. ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
Yes, i guess so. It also has other problems, because not all storage type supports cloning from snapshots ... So it was an interesting idea, but does not really solve all problems :-/ To solve the problem for the ZFSPlugin, I think it may help to introduce another storage API call to activate/deactivate snapshots: sub activate_snapshot($cfs, $volid, $snapname); sub deactivate_snapshot($cfs, $volid, $snapname); Or simply extend the existing API and pass a 'snapname' parameter: sub activate_volumes($cfg, $vollist, $exclusive, $snapname); sub deactivate_volumes($cfg, $vollist, $snapname); For the ZFSPoolPlugin, this can mount/umount snapshot subvolumes (which are not mounted by default). For the ZFSPlugin, this can create and activate a clone (or something similar)? ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
While thinking about this, I came to a totally different topic. Would it make sense to add an Linux iSCSI (LIO) backend (LunCMD driver)? It is really easy to setup a ZFS box with our installer, so one could easily use such box as external iSCSI storage then? Comments? ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
On Fri, 28 Aug 2015 19:35:51 +0200 (CEST) Dietmar Maurer diet...@proxmox.com wrote: I just thought we can write a PVE::Storage::LunCmd::LIO, so that we can use a normal Linux/Proxmox box (with zfsonlinux) with the PVE::Storage::ZFSPlugin. This makes sense. I guess it is already possible with PVE::Storage::LunCmd::Iet, but LIO should provide better performance? I have been thinking about this as well because Iet is deprecated in newer distributions (younger Debian Wheezy) -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael at rasmussen dot cc http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xD3C9A00E mir at datanom dot net http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE501F51C mir at miras dot org http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE3E80917 -- /usr/games/fortune -es says: SEMPER UBI SUB UBI [ Always wear underwater ] pgpFMcCjGt2WZ.pgp Description: OpenPGP digital signature ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
I found this on reddit: https://www.reddit.com/r/debian/comments/34t0gc/whats_your_favourite_thing_about_jessie/cqxuyy2 The targetcli author replies. I'm a bit confused as to iscsi server support in proxmox - there's tgt, but appears to be missing init scripts? Iet doesn't work with kernel 3.10, so really there is only lio/targetcli. Earlier you seemed to imply that the ZFS/iet plugin works with targetcli - is that the case? Sent from Mail for Windows 10 From: Dietmar Maurer Sent: Saturday, 29 August 2015 5:49 AM To: Michael Rasmussen;pve-devel@pve.proxmox.com Subject: Re: [pve-devel] ZFSPlugin snapshot question I guess it is already possible with PVE::Storage::LunCmd::Iet, but LIO should provide better performance? I have been thinking about this as well because Iet is deprecated in newer distributions (younger Debian Wheezy) But I just noticed that there is no targetcli package for jessie! I wonder if/why nobody use that software? ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
I guess it is already possible with PVE::Storage::LunCmd::Iet, but LIO should provide better performance? I have been thinking about this as well because Iet is deprecated in newer distributions (younger Debian Wheezy) But I just noticed that there is no targetcli package for jessie! I wonder if/why nobody use that software? ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
On Thu, 27 Aug 2015 19:31:49 +0200 (CEST) Dietmar Maurer diet...@proxmox.com wrote: Do you have time to implement that? We would need it to implement snapshot backup for LXC containers. Yes, I will look in to this this weekend. Forgot to mention. Since snapshots by nature is read-only you have to set option wp=true to have iscsi properly advertise read-only to the mount util. I think Linux will make some internal optimization given it knows writes is not supported. -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael at rasmussen dot cc http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xD3C9A00E mir at datanom dot net http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE501F51C mir at miras dot org http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE3E80917 -- /usr/games/fortune -es says: The ultimate game show will be the one where somebody gets killed at the end. -- Chuck Barris, creator of The Gong Show pgp1rosdscLoX.pgp Description: OpenPGP digital signature ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
Re: [pve-devel] ZFSPlugin snapshot question
On Thu, 27 Aug 2015 17:46:45 +0200 (CEST) Dietmar Maurer diet...@proxmox.com wrote: But how can we implement this with the ZFSPlugin?`Any idea if/how it is possible to access a snapshotted device? There are two preconditions which must be fulfilled: 1) LUN must be pointing to the snapshot 2) A view must be created pointing to the LUN Removing the snapshot means doing it in reversed order. -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael at rasmussen dot cc http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xD3C9A00E mir at datanom dot net http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE501F51C mir at miras dot org http://pgp.mit.edu:11371/pks/lookup?op=getsearch=0xE3E80917 -- /usr/games/fortune -es says: Does the name Pavlov ring a bell? pgpxcMYFt6y6R.pgp Description: OpenPGP digital signature ___ pve-devel mailing list pve-devel@pve.proxmox.com http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
