I am adding some drives to an IBM xSeries 345. I recently picked up
(via eBay) an IBM packaged Seagate drive, all with the proper IBM
part numbers as:
U320 15k
36.4GB formatted capacity
(IBM part 06P5776 / 06P5778, with Seagate drive ST336753LC)
Looking up both the IBM part numbers and the Seagate part numbers via
Google, I consistantly get that the drive's formatted capacity is
36.4GB.
When partitioned either in "safe" or "dd" mode (via sysinstall) and
set to use the entire disk as one slice, once the drive is mounted I
show:
# df -m
/dev/da1s1 33617 0 30928 0% /misc
# df -h
/dev/da1s1 33G 4.0K 30G 0% /misc
I'm seeing approx. 30,600MB (32.8GB?) free -
I suspect three things are goping on
1) disk makers specify GB as 1,000,000,000 bytes but everybody else
specifies 1,073,741,824 bytes (1024*1024*1024) this will yeild 33.9 GB
from your 36.4 GB drive
I have always seen drives format out at less but the thing that threw
me was that 36.4 was listed as "formatted capacity" - by IBM (not
Seagate). This helps though. Somehow this reminds me of the # of
hotdogs in a pack vs. # of buns.
2) formatting itself takes some space for superblocks etc
Figured, but not much, right?
3) some psace is reserved (man newfs and tunefs for info)
Read those man pages and that helped a lot. I have read this before
and it wasn't retained. 8% is the kind of loss I was looking for.
Thanks for all the quick answers.
d.
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