On Fri, Sep 11, 2009 at 01:54:56PM -0700, Dominic Lepiane wrote:
> Dear list
>
> With our Amanda setup, we've got two tape autoloaders attached to two
> separate servers. I had initially tried to run both autoloaders on 1
> server, but they were giving me a lot of trouble so we went with two
> separate servers. They're both Ultrium 2 tapes and the one autoloader
> has 8 tapes and the other has 16 tapes (and happens to have a barcode
> scanner). We've been running both basically independently, one backing
> up some hosts the other backing up the rest. But our backups have grown
> such that the 8 tape system is keeping data from a much shorter period
> of time. As it stands now, I'm just going to rebalance which hosts are
> backed up to which server and will probably have to do so again in 3-6
> months...
Dominic,
I was able to fun two separate amanda configs from the same host,
but in order to that I split my DLEs into local client (client==server
and avoided network) and remote (client!=server).
You could use RAIT (Redundant Array of Inexpensive Tape, I believe)
while I think that was designed to round robin standalone units you
might be able to get it to round robin the jukeboxes -- but I don't
know if there is a way to round robin the robots which will be needed
to do this, so you might not be able to get there from here.
> So I was wondering if it's possible to have roughly 1 amanda server
> feeding backups to two tape hosts giving us logically a 24 tape pool to
> work with rather than managing the two pools separately.
I take it you are not rotating tapes from the jukes to offsite ?
You are ok for HW failures and 'accidental' file deletions but
if your not pulling tapes you have no ability to recover from
catastrophy (flood, fire, etc...)
Rotating tapes through the jukeboxes would help with the first
problem as well.
If you really want to split up your backups, without pulling
tapes, you could run two separate amanda configs, one for
weekly L0 and one other, but you need to split the pool and
that will leave you even shorter on tape cycle then you are now.
You might extend tape use with the newer "wait to write/flush"
options that will allow you to wait for full tapes before writing
so you fill each to capacity, allowing tape spanning will also
help with that.
> The other question I had was whether it is possible to split up the L0
> backups from the incremental backups. We are taking weekly L0 backups
> and we would like to keep the L0s around longer rather than having the
> tapes reused by incremental backups. Could we for example, do the L0
> backups with our 16 tape server and the L1+ backups with the 8 tape
> server? Or, could we send the L0 backups to tape and L1+ to disk?
>
> Thanks in advance,
> - Dominic L
---
Brian R Cuttler brian.cuttler AT wadsworth DOT org
Computer Systems Support (v) 518 486-1697
Wadsworth Center (f) 518 473-6384
NYS Department of Health Help Desk 518 473-0773
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