I just wanted to make sure this is normal and is expected. I fully
expected that as the file-system filled up I would see more disk space
being used than with other file-systems due to its features but what I
didn't expect was to lose out on ~500-600GB to be missing from the total
volume size right at file-system creation.
Comparing two systems, one being JFS and one being ZFS, one being raidz2
one being raid6. Here is the differences I see:
ZFS:
r...@opensolaris: 11:22 AM :/data# df -k /data
Filesystem kbytes used avail capacity Mounted on
data 17024716800 258872352 16765843815 2% /data
JFS:
r...@sabayonx86-64: 11:22 AM :~# df -k /data2
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sdd1 17577451416 2147912 17575303504 1% /data2
zpool list shows the raw capacity right?
r...@opensolaris: 11:25 AM :/data# zpool list data
NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT
data 18.1T 278G 17.9T 1% 1.00x ONLINE -
Ok, i would expect it to be rounded to 18.2 but that seems about right
for 20 trillion bytes (what 20x1 TB is):
r...@sabayonx86-64: 11:23 AM :~# echo | awk '{print
20000000000000/1024/1024/1024/1024}'
18.1899
Now minus two drives for parity:
r...@sabayonx86-64: 11:23 AM :~# echo | awk '{print
18000000000000/1024/1024/1024/1024}'
16.3709
Yet when running zfs list it also lists the amount of storage
significantly smaller:
r...@opensolaris: 11:23 AM :~# zfs list data
NAME USED AVAIL REFER MOUNTPOINT
data 164K 15.9T 56.0K /data
I would expect this to be 16.4T.
Taking the df -k values JFS gives me a total volume size of:
r...@sabayonx86-64: 11:31 AM :~# echo | awk '{print
17577451416/1024/1024/1024}'
16.3703
and zfs is:
r...@sabayonx86-64: 11:31 AM :~# echo | awk '{print
17024716800/1024/1024/1024}'
15.8555
So basically with JFS I see no decrease in total volume size but a huge
difference on ZFS. Is this normal/expected? Can anything be disabled to
not lose 500-600 GB of space?
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