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Re: [Networker] Selecting the first tape an nsrclone will need
2008-10-14 08:15:16
On 10/14/08 1:20 AM, tkimball wrote:
Francis Swasey wrote:
So, my question is: What is the best algorithm to use to determine
which ssid will be the first one NetWorker will decide to clone from a
list of ssid's. My current algorithm is picks the first tape from the
ssid that has the earliest start time. This morning, that didn't work
and NetWorker mounted a different tape -- so, obviously, my algorithm
isn't the best.
Is anyone else doing scripted cloning and using an algorithm to
pre-mount the first source tape to force where the cloning happens?
I'm doing something like that, but it's a bit convoluted:
1) Grab a listing of SSID/volume pairs + flags
2) generate summary data containing # of complete and 'head' savesets for each
volume
3) mount each volume in series, with the first volume being the one with the
most full (then the most 'head' SSIDs). Kick off the clone of that listing.
4) sleep 10 mins (allow ejects) and repeat #3 until all tapes done.
I determine 'what source pool mounts to what SN' by a config file that is
referenced; It includes an approximate number of hosts that should be in the
backup, so we know (in theory) if there's a miscount someplace.
Having a config file for what SN the tapes mount to, allow me to switch systems
if a drive has failed on one of them (we only have two LTO on each of Server
and SN right now).
I'm posting the relevant portion of the script below. Warning, its in csh. ;)
--TSK
Aha! Thank you! I had completely overlooked the possibility of
breaking the given list of ssid's down further and running nsrclone with
a set of ssid's that are known to be completely contained or at least
start on the tape that I mount! That's brilliant!!!!
Now to go write that algorithm in perl -- which is slightly less likely
to cause brain damage than csh :-)
Frank
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