How to convert the total blocks written to tap to Gigs

[Michael Gildersleeve]

I am backing up to a DLT tape with 40Gig natural and 80Gig compressed format. I am using the compressed format and need to know how to convert what is being backed up to Gigs.

fbackup(3056): total blocks written to output file /dev/rmt/0m: 257433486

What is the conversion to Gigs?
Here is my config file that fbackup uses...
blocksperrecord 256
records 64
checkpointfreq 128
readerprocesses 6
maxretries 4

Thank you for your help.
Mike

[Dave Hutton · Accepted solution]

Looking at the man page (fbackup) it says this about block size:
Note also that the blocksize used in
earlier releases (7.0 and before) was 512 bytes, whereas it is now
1024 bytes.

So if a block is 1024 bytes and you wrote 257433486 blocks. You had written 263611889664 bytes.

It's my guess.

Dave

[Michael Gildersleeve]

Ok, I saw that, however... that would mean that my 80Gig compressed mode tape is actually holding 245.51Gig by your 263611889664.00 bite calculation. That is
(((263611889664.00 /1024)/1024)/1024) = 245.51 Gigs. Wouldn't that be impossible?