streamers & encryption

[plmuon]

Hello,

Are there any catches to using xar tape streamers? The fact that it
seeks immediately to a file seems to make it extra well suited for
that.

Also I would like to make encrypted backups. Are there any plans to
add encryption?

regards,

peter

[Rob Braun]

On Nov 24, 2007 2:07 AM, plmuon <plm...@gmail.com> wrote:
>
> Are there any catches to using xar tape streamers? The fact that it
> seeks immediately to a file seems to make it extra well suited for
> that.

I have not personally tried using xar directly from tape. I'd be
interested to know how it goes!

> Also I would like to make encrypted backups. Are there any plans to
> add encryption?

That is a good feature suggestion, I have no opposition to its inclusion.

Rob

[plmuon]

On Nov 26, 4:14 pm, "Rob Braun" <bbr...@gmail.com> wrote:
> On Nov 24, 2007 2:07 AM, plmuon <plm...@gmail.com> wrote:
>
>
>
> > Are there any catches to using xar tape streamers? The fact that it
> > seeks immediately to a file seems to make it extra well suited for
> > that.
>
> I have not personally tried using xar directly from tape. I'd be
> interested to know how it goes!

I tried it, but it doesn't work. It says "Error adding file ..."
Looking with strace I notice that xar writes a number of times 4096
bytes to the tape. Then after about 100 blocks, it tries to write 4096
bute write() returns less. The next time it returns -1 with errno
ENOSPC (no space left on device).

peter

[Rob Braun]

Oh yes, you're going to need to create the archive on
random access storage, then write it to tape. Extraction
directly from tape should be possible.

Rob