Marcus Pless <[email protected]> writes:
> I'm looking at a new backup server and trying to spec
> something that will keep up with incoming amanda dump
> files and keep an LTO6 drive streaming. It looks like
> 16 7200 rpm drives in a RAID 10 should easily be able
> to feed an LTO6 drive but I'd like to hear what any
> other LTO6 users are doing for a holding disk.
LTO6 isn't much faster than LTO4, AFAIR 160MB/s vs. 120 MB/s.
I am running five linux md raid5, each consisting of five 2 TB SAS
drives (7200 rpm). The five RAIDs give me five independant
"spindles". This gives enough concurrency for both incoming and outgoing
data (i.e. both dumping and taping). This gives me full taping speed:
driver: result time 180317.487 from taper: PARTDONE 00-00401
labelxxx 2 579595935 "[sec 3694.959354 bytes 593506237887 kp s 156861.247844
orig-kb 765306100]"
In your case I'd suggest 4 raids with four drives each.
I have that many disks because I want the holding disks to be able to
keep a full amanda dump. So the backup works even when tapes, tape
drives or tape changer fail completely.
Sven
