hik@cascade.carleton.CDN (warren hik) (01/05/89)
In our Apollo Network (SR 9.7), we have the following:
12 DN4000 with 150MB Harddrives
2 DN3000 with 330MB Harddrives
2 Storage Modules with 280MB Harddrives
10 Diskless DN300's and DN320's
2 DSP80's
1 DSP90
Total Disk Space: 3 GB
======================
In order to to do a full backup, we use a Cipher
tape drive with 30MB Magtapes. We find this process
slow (1 hour per tape) and error prone. (I/O errors mostly)
===========================================================
We need to find new strategies for backing up
user files. If you use:
1) High density tape drives
2) Tape cartridges
3) Optical Disks
4) or anything else
for backups, and are satisfied with the results, please
outline:
1) the type of equipment you use
2) any interface requirements
(ie. only on DN4000's running SR. 10)
3) the impact of SR. 10 (if applicable)
4) speed and accuracy statistics (best guess)
Thank you for your assistance...
Warren Hik
hik@cascade.carleton.cdn
hik%cascade.carleton.cdn@ubc.csnet
hik%cascade.carleton.cdn%ubc.csnet@csnet-relay.arpaferguson@garnet.bucknell.EDU ("Scott R. Ferguson") (01/06/89)
I've got a Workstation Solutions ExaTape 8mm tape drive, and I
think it's the bee's knees. It came with a SCSI interface card
and support software for doing rwmt, tar, rbak and wbak. With the
capacity of 2.3 GBytes per tape, I can back up my entire system,
including all of the OS directories if I wish, overnight.
I'm not going to SR10 until the summer (actually, I'm leaving my
job here for one with Exxon, and my replacement will have to learn
a lot before doing an OS update), so I can't say the effects of SR10.
The guys at Workstation Solutions seem to really know their Apollo stuff,
so I'm fairly confident that there won't be a problem.
Depending on the machine you connect the drive to, you can get the following
data rates (depending on network traffic or whatever else):
DN4000: 256 K/sec
DN3000: 128 K/sec
You might want to confirm those with a call to the company.
To back up 2000 Mbytes (2 GBytes), it takes me about 10 hours, but it's
so automated, I just swap tapes in the morning. I have a shell script to
wbak chosen directories every night starting at 8 p.m., and it finishes at
4:30 a.m.
Good Luck.
Scott Ferguson
Bucknell University CAED Center
ferguson@apollo.bucknell.edu