6 Apr
2003
6 Apr
'03
4:10 p.m.
Ron,
If you're really serious about having failsafe backup, get a PogoLinux
StorageWare 3800 1.2TB IDE RAID (RAID 5 with spare). Use rsync to
automatically back up your SCSI RAIDs to the 3800 (crontab). Then get
an HP Ultrium SCSI tape drive to hook to the 3800. The drives run about
5K and tapes are down to about $80 per. They are advertised to hold
200GB compressed, 100GB native. You know how those advertisements are.
I didn't believe it so I did my own tests at work. Using byte compacted
(as opposed to compressed or bit compacted) sonar data I got 170-180GB
per tape with an actual write speed to tape of 13.465MB/sec. DDS just
ain't in the race at 1MB/sec for DDS3 or 2MB/sec for DDS4 (those are
rated numbers, not actual). This setup would run you about 11K. I
figured I'd throw this out here while we were dreaming ;)
Jan
On Sun, 2003-04-06 at 05:36, R Parker wrote:
Hi,
--- Steve Harris <S.W.Harris(a)ecs.soton.ac.uk> wrote:
Yikes! I'm using large ide disks to mirror the scsi
raid array.
I've been thinking about switching our archive
strategy from DD3 tape to rewritable DVD. DVD is
probably alot more convienant for clients.
The following is pretty far off the orginal topic.
Reguardless, it's encouraging and exciting to know
what we can expect from professional audio in linux.
BTW, my interest in producing audio with a linux based
environment is the Ardour mission statement where
professional audio is a requirement.
How effective an audio environment can we build on
linux with jackd the high bandwidth, low latency audio
server?
Earlier tonight, I ran the following tasks
symoultaneously:
*Rsync mirror via LAN
*Mastering of stereo file on Mac via 100mb LAN, atalk
*'cp -R 2gig directory from channel A to channel B of
scsi raid controler
*Ardour; playback of eight audio channels
*switching virtual desktops and applications windows,
'ctrl c + hold tab key infinitely' then 'alt + f1,4'
like a mad man, and then checking yahoo mail
repeatedly
jackd started with 'jackd -R -v -d alsa -d hw:0 -p 512
-r 44100'
During a twenty minute stretch with the above tasks
being done at the same time, I generated one xrun. The
"-p 512" is an exceptable latency for me because I use
an external mixing consol and build the studio and
control room mixes from the input stages.
Anyway, my new point is that professional audio
production in linux is a reality.
ron
gotta
duck and cringe. :) Guys, with my
requirements,
could it be done better and for less money?
It's
not
Hell no, I'd use exactly the same setup. My
experience is that it costs
far more to back up a large disk system than it does
to populate it with
disks anyway. - Steve
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