Frederic Payet - Availability Services wrote:
Hi gurus,
When creating some small files an ZFS directory, used blocks number is
not what could be espected:
hinano# zfs list
NAME USED AVAIL REFER MOUNTPOINT
pool2 702K 16.5G 26.5K /pool2
pool2/new 604K 16.5G 34K /pool2/new
pool2/new/fs2 570K 16.5G 286K /pool2/new/fs2
pool2/new/fs2/subfs2 284K 16.5G 284K /pool2/new/fs2/subfs2
hinano# pwd
/pool2/new/fred
hinano# zfs get all pool2/new
NAME PROPERTY VALUE SOURCE
pool2/new type filesystem
- pool2/new creation Tue Mar 20 13:27
2007 - pool2/new used
603K - pool2/new
available 16.5G -
pool2/new referenced 33.5K
- pool2/new compressratio
1.00x - pool2/new
mounted yes -
pool2/new quota none
default pool2/new reservation
none default pool2/new
recordsize 128K default
pool2/new mountpoint /pool2/new
default pool2/new sharenfs
off default pool2/new
checksum on default
pool2/new compression off
default pool2/new atime
on default pool2/new
devices on default
pool2/new exec on
default pool2/new setuid
on default pool2/new
readonly off default
pool2/new zoned off
default pool2/new snapdir
hidden default pool2/new
aclmode groupmask default
pool2/new aclinherit secure default
hinano# mkfile 9 file9bytes
hinano# mkfile 520 file520bytes
hinano# mkfile 1025 file1025bytes
hinano# mkfile 1023 file1023bytes
hinano# mkfile 10 file10bytes
hinano# ls -ls
total 14
3 -rw------T 1 root root 1023 Apr 4 13:34 file1023bytes
4 -rw------T 1 root root 1025 Apr 4 13:34 file1025bytes
1 -rw------T 1 root root 10 Apr 4 13:38 file10bytes
3 -rw------T 1 root root 520 Apr 4 13:33 file520bytes
2 -rw------T 1 root root 9 Apr 4 13:33 file9bytes
After 2 seconds :
hinano# ls -ls
total 13
3 -rw------T 1 root root 1023 Apr 4 13:34 file1023bytes
4 -rw------T 1 root root 1025 Apr 4 13:34 file1025bytes
2 -rw------T 1 root root 10 Apr 4 13:38 file10bytes
3 -rw------T 1 root root 520 Apr 4 13:33 file520bytes
2 -rw------T 1 root root 9 Apr 4 13:33 file9bytes
2 questions :
- Could somebody explain why a file of 9 bytes takes 2 512b blocks ?
One block for the znode (the meta-data), one block for the data.
- Why the block number of file10bytes has changes after a while doing
nothing more than 'ls -ls'
The block count reflects the actual allocated storage on disk. The
first time you did an 'ls' the data block had not yet been allocated
(i.e., the data was still "in transit" to the disk).
Please reply me directly as I'm not in this alias .
Best,
fred
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