Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
ph == Phil Harman phil.har...@gmail.com writes: The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. What Erik said is stronger than the man page in an important way, though. He said you can dump an old stream into a filesystem on a new zpool, and when you 'zfs send' the stream back out, it'll be in the old format. Keeping this commitment means you can store s10 streams on snv_xxx backup servers as expanded filesystems, not stream-inside-a-file, and still restore them onto s10 by 'zfs send'ing from nevada. One reason this makes sense as something one might actually do because zpools are a lot more resilient to corruption than 'zfs send' streams. pgpe1IUEUzQ4Y.pgp Description: PGP signature ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
Miles Nordin wrote: ph == Phil Harman phil.har...@gmail.com writes: The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. What Erik said is stronger than the man page in an important way, though. He said you can dump an old stream into a filesystem on a new zpool, and when you 'zfs send' the stream back out, it'll be in the old format. Keeping this commitment means you can store s10 streams on snv_xxx backup servers as expanded filesystems, not stream-inside-a-file, and still restore them onto s10 by 'zfs send'ing from nevada. One reason this makes sense as something one might actually do because zpools are a lot more resilient to corruption than 'zfs send' streams. It also came in very handy for me to archive a stream that caused a panic on Solaris 10. I was able to resend the stream to test patches. -- Ian. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
Yes indeed, but my point was that it was not always so. This change was something I and others campaigned for quite some time ago. Indeed, in the early days of ZFS evangelism (when I was still at Sun) the issue came up rather often. In those days there were even more reasons not to use a zfs send stream as a backup. My point was made partly to celebrate this welcome change (as reflected in the manpage) because I was pleasantly surprised to find that the change we had requested has already been delivered. The other reason for my point was to remind people that there may be system out there for which this may not be the case, in which the old restrictions still hold until the relevant patches and/or upgrades have been applied. Indeed, the heads up link I posted seems to imply that there are still some older versions of ZFS stream format which cannot be imported - that backwards compatibility has its reasonable limits. When it come to Erik's exciting extention beyond what is already good news, perhaps the manpage needs to be stronger? It would be a shame for such useful information to be accessible only to random googlers and the august readers of this list. On 14 Nov 2009, at 17:58, Miles Nordin car...@ivy.net wrote: ph == Phil Harman phil.har...@gmail.com writes: The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. What Erik said is stronger than the man page in an important way, though. He said you can dump an old stream into a filesystem on a new zpool, and when you 'zfs send' the stream back out, it'll be in the old format. Keeping this commitment means you can store s10 streams on snv_xxx backup servers as expanded filesystems, not stream-inside-a-file, and still restore them onto s10 by 'zfs send'ing from nevada. One reason this makes sense as something one might actually do because zpools are a lot more resilient to corruption than 'zfs send' streams. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
It says at the end of the zfs send section of the man page The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. 'Twas not always so. It used to say The format of the stream is evolving. No backwards compatibility is guaranteed. You may not be able to receive your streams on future versions of ZFS. See http://hub.opensolaris.org/bin/view/Community+Group+on/2008042301 Thanks, Phil. I knew I read the man page in its entirety at one point, and had just cause to be nervous, and when this comment basically read the man page came out - and it was obvious now that there's no problem - I knew it sounded like news to me. Thanks for the clarification. I feel even more sane now. ;-) ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
On Thu, November 12, 2009 13:36, Edward Ned Harvey wrote: I built a fileserver on solaris 10u6 (10/08) intending to back it up to another server via zfs send | ssh othermachine 'zfs receive' However, the new server is too new for 10u6 (10/08) and requires a later version of solaris . presently available is 10u8 (10/09) Is it crazy for me to try the send/receive with these two different versions of OSes? It says at the end of the zfs send section of the man page The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. That would seem to be a rather strong general commitment. That makes it IMHO at least worth experimenting with the case you need, see if it accepts the stream. It should, according to the man page. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
David Dyer-Bennet wrote: On Thu, November 12, 2009 13:36, Edward Ned Harvey wrote: I built a fileserver on solaris 10u6 (10/08) intending to back it up to another server via zfs send | ssh othermachine 'zfs receive' However, the new server is too new for 10u6 (10/08) and requires a later version of solaris . presently available is 10u8 (10/09) Is it crazy for me to try the send/receive with these two different versions of OSes? It says at the end of the zfs send section of the man page The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. That would seem to be a rather strong general commitment. That makes it IMHO at least worth experimenting with the case you need, see if it accepts the stream. It should, according to the man page. Like so many other things in Solaris, older revs of ZFS are supported in newer releases of Solaris. :-) When you create a zfs filesystem on a version of Solaris, by default it is created by the latest ZFS fs version that version of Solaris supports. HOWEVER, you can explicitly create a zfs filesystem with a backrev version, and it works fine (you just don't get the latest features). Look at the ZFS man page for creating a filesystem with a version other than the default. This works for 'zfs send|receive', with this caveaut: the receiving filesytem will be created with the zfs filesystem version of the SENDER. So, it's possible to send/receive a ZFS filesystem from a OLDER version of Solaris to a NEWER version, but NOT vice versa (unless the zfs filesystem on the newer Solaris was explicitly created with a backrev version that the older Solaris understands). An example: (and, I'm sure I don't have the ZFS version numbers right, so check the man pages) Say 10u6 supports ZFS version 10, and 10u8 support ZFS version 12. By default, a 10u6 machine creates v10 ZFS filesystems, and 10u8 creates v12 filesystems. But, a 10u8 systems can also create v10 filesystems. So, you can send a 10u6 ZFS filesystem to a 10u8 machine, resulting in creating a new v10 filesystem on the 10u8 machine. However, you can't send a v12 filesystem from the 10u8 machine to the 10u6 machine. If you explicitly create a v10 filesystem on the 10u8 machine, you can send that filesystem to the 10u6 machine. I hope that's clear. -- Erik Trimble Java System Support Mailstop: usca22-123 Phone: x17195 Santa Clara, CA ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
*snip* I hope that's clear. Yes, perfectly clear, and very helpful. Thank you very much. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] zfs send from solaris 10/08 to zfs receive on solaris 10/09
On 12 Nov 2009, at 19:54, David Dyer-Bennet d...@dd-b.net wrote: On Thu, November 12, 2009 13:36, Edward Ned Harvey wrote: I built a fileserver on solaris 10u6 (10/08) intending to back it up to another server via zfs send | ssh othermachine 'zfs receive' However, the new server is too new for 10u6 (10/08) and requires a later version of solaris . presently available is 10u8 (10/09) Is it crazy for me to try the send/receive with these two different versions of OSes? It says at the end of the zfs send section of the man page The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. 'Twas not always so. It used to say The format of the stream is evolving. No backwards compatibility is guaranteed. You may not be able to receive your streams on future versions of ZFS. See http://hub.opensolaris.org/bin/view/Community+Group+on/2008042301 However, the above states that you're ok within Solaris 10 (which got a usable ZFS quite late in the day - you were very brave if you used the s10u3 implementation), and I've only fallen foul of the issue with old Nevada and OpenSolaris versions. That would seem to be a rather strong general commitment. That makes it IMHO at least worth experimenting with the case you need, see if it accepts the stream. It should, according to the man page. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss On 12 Nov 2009, at 19:54, David Dyer-Bennet d...@dd-b.net wrote: On Thu, November 12, 2009 13:36, Edward Ned Harvey wrote: I built a fileserver on solaris 10u6 (10/08) intending to back it up to another server via zfs send | ssh othermachine 'zfs receive' However, the new server is too new for 10u6 (10/08) and requires a later version of solaris . presently available is 10u8 (10/09) Is it crazy for me to try the send/receive with these two different versions of OSes? It says at the end of the zfs send section of the man page The format of the stream is committed. You will be able to receive your streams on future versions of ZFS. Twas not always so. It used to say http://hub.opensolaris.org/bin/view/Community+Group+on/2008042301 That would seem to be a rather strong general commitment. That makes it IMHO at least worth experimenting with the case you need, see if it accepts the stream. It should, according to the man page. -- David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
