"Dennis Clarke" <[EMAIL PROTECTED]> wrote:
>
> As near as I can tell the ZFS filesystem has no way to backup easily to a
> tape in the same way that ufsdump has served for years and years.
...
> # mt -f /dev/rmt/0cbn status
> HP DAT-72 tape drive:
> sense key(0x0)= No Additional Sense residual= 0 retries= 0
> file no= 0 block no= 0
> # zfs send zfs0/[EMAIL PROTECTED] > /dev/rmt/0cbn
> cannot write stream: I/O error
> #
This looks like a tape problem....
> Of course it took a number of hours for that I/O error to appear because the
> tape hit its capacity. There were no reports of 10% or 20% and no prompt
> for "end of media" and "please insert a blank tape and hit enter when ready"
> sort of thing.
Are you sure that this is caused by a EOT situation?
If this was EOT, then I would not expect EIO.
> (1) perhaps I can break my ZFS filesystem area into chunks that fit on
> a HP DAT-72 tape drive without compression. I think this is just
> not reasonable.
Is the ZFS backup unable to write multi-volume backups?
If this is true, then it is not yet ready for production.
> (2) perhaps I can use find and tar or cpio to backup small "tape drive
> capacity" sized chunks of the ZFS filesystem. Then dump these with
> some hand written notes or post-it notes to indicate what directory
> bits I have and what tape is needed to get the other bits. Let me
> expound on this a tad :
I can neither recommend Sun tar not cpio for backups.
>
> However I will quickly end up with a pile of tapes to dump
> one ZFS filesystem and no easy way to get incrementals
> other than to 'touch timestamp' and then use find to build
> a list of new or modified files based on the -newer switch.
star supports true incremental bsckups for POSIC compliant filesystems.
The way star works is very similar to what ufsdump does except that star
accesses the FS in a clean official way.
Jörg
--
EMail:[EMAIL PROTECTED] (home) Jörg Schilling D-13353 Berlin
[EMAIL PROTECTED] (uni)
[EMAIL PROTECTED] (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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