eho@word.princeton.edu (Eric Ho) (07/26/89)
Does anyone tried dumping stuff on the Exabyte tape drive using the no-rewind option and that it worked correctly (i.e. you can restore the stuff back correctly) ? I'm planning to dump several hundred meg of my stuff onto the Exabyte each night (I figured that 2 or 3 dumps will fill one tape -- I could have use 1 tape each night but it seems to be a waste of resource and I don't want to change tape everyday). Do I have to do mt -f /dev/rxb0 rew mt -f /dev/nrxb0 fsf <n> first and then do the dumps OR just adding dump 0uf /dev/nrxb0 <my own filesystem> into my crontab file would do the job ? In other words, will dump write out all the file/tape marks correctly for each transaction and that when I want to restore my own filesystem back, I'll just need to 'mt -f ... fsf <n>' (where n is the nth night) and then do a restore ? I'm doing this on my Sun-4/260 under OS 4.0.1 (Generic kernel + the apunix exabyte driver). I'll be nice if I don't need to do all those 'mt' stuff just to append a dump to the tape though otherwise I'll have to write a script (basically, to check for what day of week it is and then give the correct number to 'mt ... fsf <n>' and then do the dump). Any pointers will be much appreciated. Eric Ho Cognitive Science Lab., Princeton University voice = 609-987-2819 (x2987) email = eho@confidence.princeton.edu eho@bogey.princeton.edu
ekrell@ulysses.att.com (Eduardo Krell) (07/28/89)
You don't have to rewind the exabyte tape. Just use the non-rewinding
device and everything will work OK. Since you got your drive from APUNIX,
why don't you use their mdump facility to dump multiple file systems onto
a single tape?
Eduardo Krell AT&T Bell Laboratories, Murray Hill, NJ
UUCP: {att,decvax,ucbvax}!ulysses!ekrell Internet: ekrell@ulysses.att.com