topic Re: backup size in Operating System - HP-UX

backup size

Peter Gillis — Tue, 30 Jul 2002 00:09:39 GMT

i need to supply a number that indicates how much space is used when we do full system backup. I have checked output of fbackup: There is a figure there: total blocks written to output: 14,358,342. Since this is blocks, I am wondering how to convert to megabytes?
Is there any other (more reliable?) way to get
this type of info?
system hp-ux 11.00
machine d220

Thanks for you help with this
Maria

Re: backup size

A. Clay Stephenson — Tue, 30 Jul 2002 00:22:03 GMT

The blocksize for all reasonably modern versions of fbackup is 1024 bytes; very old versions were 512 bytes.

Since 1MB = 1024X1024 your answer is

Backup Size (MB) = NBLOCKS / 1024.

Re: backup size

Tom Dawson — Tue, 30 Jul 2002 00:35:33 GMT

Maria,

Clay is absolutely right. From the man page for fbackup on a 11.11 system:

"Note also that the blocksize used in
earlier releases (7.0 and before) was 512 bytes, whereas it is now 1024 bytes."

Tom

Re: backup size

Peter Gillis — Tue, 30 Jul 2002 00:35:37 GMT

Thanks Clay - a related question. How come on issuing bdf cmd the used field for a filesystem says, for example, /tmp 3150 ; and when I do a cd /tmp, and then go du -sk it replies back with 1961?

thanks Maria.

Re: backup size

Michael Tully — Tue, 30 Jul 2002 00:46:17 GMT

Hi Maria,

# bdf /tmp
Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol5 524288 336820 175795 66% /tmp
# du -sk
335397 .

At a guess I would say that your problem relates to file(s) that may have been removed, but are still in use by the system. The example from one of my systems suggests that I don't have a similar problem to yours. Doing this on /tmp may produce these differences many times as it is really a dumping ground for many processes. What happens when you do this on any other filesystems? I think you'll find that they are ok.

HTH
Michael

Re: backup size

Peter Gillis — Tue, 30 Jul 2002 01:53:44 GMT

Michael
thanks. yes, it does seem that tmp is the directory with the largest difference and the others are much more similar to your example. thanks for the explanation.
Maria.