backup size

[Peter Gillis]

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

[A. Clay Stephenson · Accepted solution]

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.

[Tom Dawson]

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

[Peter Gillis]

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.

[Michael Tully]

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

[Peter Gillis]

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.