| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 577.1 | | DECWET::EVANS | NSR Engineering | Mon Apr 14 1997 16:56 | 26 |
| >I think that because I had the "volume default capacity" set to 30GB
>NetWorker did not know that the tape was running out and the full backup of
>the F: did not complete when the tape was full. Does this sound correct?
partly correct: NetWorker does not know a tape is running out, because
it depends upon the device to return an error when there is no more
tape upon which to write!
>So question 2 is I need to reset the volume default capacity to 20GB but how
>to recover my tapes? Do I run scanner on each tape? this could take days.
yes, scanner the tape back into the index (scanne -i /dev/...) -HOWEVER-
resetting the capacity does NOT affect the actual contents of a volume.
Only relabeling will. do a recover (GUI or command line) and browse for
known files that are supposed to be on that volume.
>Also on the TZ88 it should hold 20 GB uncompressed and best case 40 GB
>compressed. I guess this doesn't matter to the volume default capacity.
Depends upon what kind of data is being compressed.
>I guess this doesn't matter to the volume default capacity.
yes. correct. The hardware does the compression, not NetWorker. NetWorker
reports how many bytes went down the "pipe" to the device, not how many
were written to media.
|
| 577.2 | Resetting the volume capacity | NQOS01::alfras1_port24.alf.dec.com::Curle | | Mon Apr 14 1997 19:46 | 20 |
| Do you think I need to reset the tape devices to 20GB and try to recover the
tapes? Also on JRC_Full.001 I tried scanner and mounting and keep getting
CRC errors with a label not found. I had reset the tape from 30GB to 20GB
and ran recover and asked to recover one file. The autochanger tried to
mount the tape but could not because of the CRC errors. I would hate to
think I had a bad tape because two weeks ago when we spanned to the second
tape I also received errors and thought the tape was bad. Either I have a
bad batch of $100.00 per tape tapes or I have some other problem.
I am new at NetWorker so I could have set something up incorrectly.
If I look at the Volumes, the index for JRC_Full.001 is listed. Can I make a
new tape of JRC_Full.001 from the clone backup or am I just stuck? Or how
would you recommend recovering from a bad tape?
Also this is a test server and we were going to production Friday. I will
have to postpone the move to I fix this problem.
Thanks in advance,
Allen
|
| 577.3 | | DECWET::LENOX | Pass the popcorn, on with the show. | Wed Apr 16 1997 10:17 | 18 |
|
Capacity is not a value NSR uses, it is just for the
user's sake. Do not worry about resetting it unless
you care about the percentage used field being correct.
NetWorker will write a tape until it is full, at which
point it will mark the tape as full.
When you say you reset the tape from 30GB to 20GB,
what did you do? The only way that I know to reset the
capacity field is to relabel the tape. If you relabel a
tape, you no longer have access to the data written on it
before it was relabelled. This would be bad news.
How is your cloning setup? If someone was cloning a
a tape (JRC_Full.001), I can see how that can create
problems, since cloning a tape does more than just
clone the tape, savesets that continue onto other tapes
will be cloned as well (could be a timing issue).
|
| 577.4 | Volume Default Capacity | NQOS01::rdodial_port2.32.81.16.in-addr.arpa::Curle | | Tue Apr 22 1997 10:28 | 13 |
| In looking at the TZ88 documentation it states that the TZ88 can store up to
20 GB of data without compression and 40GB with compression assuming a 2:1
compression ratio.
You said that NetWorker would write until it hits the end of the tape. I am
confused in the option "Volume Default Capacity". Do I need to set this
value at 20GB or 40GB? and if I set this value at 40GB and relabel the tape
and the compression ratio isn't 2:1 will this mess up NetWorker? Or on the
other hand if I set the value to 20GB will I be shortchanging the tape
capacity?
Thanks,
Allen
|
| 577.5 | this was not the reply I was originally going to enter | DECWET::EVANS | NSR Engineering | Thu Apr 24 1997 17:54 | 15 |
| >You said that NetWorker would write until it hits the end of the tape.
this is so.
>Do I need to set this value ("Volume Default Capacity") at 20GB or 40GB?
set it to whatever makes you feel best about the display
>if I set this value at 40GB and relabel the tape will this mess up NetWorker?
no.
>if I set the value to 20GB will I be shortchanging the tape capacity?
no.
|
| 577.6 | | DECWET::FARLEE | Insufficient Virtual um...er.... | Mon Apr 28 1997 11:54 | 10 |
| To be very clear:
NetWorker will write until it receives an unrecoverable IO error from
the tape device.
At that point, the tape will be marked full and the next one will continue.
The "volume default capacity" is ONLY used for calculating the %full on the
volume display. It is only cosmetic.
Kevin
|
| 577.7 | Thanks | NQOS01::rdodial_port14.32.81.16.in-addr.arpa::Curle | | Mon May 05 1997 10:29 | 2 |
| Thanks for the reply.
Allen
|