So that is 32K clustersize. Meaning each file will consume
atleast that much space. While a large clustersize is useful
when dealing with large files (read datafiles), it will almost
always lead to space wastage when dealing with a general
purpose fs.
It could be that you did not choose this value and that mkfs
chose it for you. Older mkfs releases chose higher defaults.
With 1.2.7, we've changed the heuristics to choose the smallest
cs that can address the volume. Meaning 4k.
Luis Freitas correctly pointed out that it could be because
ocfs2 uses large inodes. And that that will also lead to more
space usage as compared to reiser. To solve this, we've recently
added inline data in 2.6.24. Inline data allows us to pack file
data into the inode itself. This will be very useful for fs' having
lots of small files. It will be available in ocfs2 1.4.
Sunil
Michael M. wrote:
Revision: 0.90
Mount Count: 0 Max Mount Count: 20
State: 0 Errors: 0
Check Interval: 0 Last Check: Fri Feb 23 02:43:43 2007
Creator OS: 0
Feature Compat: 0 None
Feature Incompat: 0 None
Feature RO compat: 0 None
Root Blknum: 17 System Dir Blknum: 18
First Cluster Group Blknum: 8
Block Size Bits: 12 Cluster Size Bits: 15
Max Node Slots: 10
Label: www
UUID: 0F98901B58E64D57B8A5556E8DC6DDC1
Inode: 2 Mode: 00 Generation: 2374663631 (0x8d8a7dcf)
FS Generation: 2374663631 (0x8d8a7dcf)
Type: Unknown Attr: 0x0 Flags: Valid System Superblock
User: 0 (root) Group: 0 (root) Size: 0
Links: 0 Clusters: 6866783
ctime: 0x45dec55f -- Fri Feb 23 02:43:43 2007
atime: 0x0 -- Wed Dec 31 16:00:00 1969
mtime: 0x45dec55f -- Fri Feb 23 02:43:43 2007
dtime: 0x0 -- Wed Dec 31 16:00:00 1969
ctime_nsec: 0x00000000 -- 0
atime_nsec: 0x00000000 -- 0
mtime_nsec: 0x00000000 -- 0
Last Extblk: 0
Sub Alloc Slot: Global Sub Alloc Bit: 65535
-----Original Message-----
From: Sunil Mushran [mailto:[EMAIL PROTECTED]
Sent: Wednesday, December 26, 2007 10:57 AM
To: Michael M.
Cc: [email protected]
Subject: Re: [Ocfs2-users] Large difference between space used on reiserfs
vs ocfs2
What's your blocksize/clustersize?
If you are on 1.2.7 tools, do:
$ tunefs.ocfs2 -q -Q "bs=%B\ncs=%T\n" /dev/sdX
If not, do:
$ debugfs.ocfs2 -R "stats" /dev/sdX
Michael M. wrote:
Dear list,
I have all of my web files for my apache servers on multiple machines
placed on ocfs2 volumes. I recently did an rsync to a reiserfs volume
on an external usb harddrive, and df reports the following:
(ocfs2 is on top, reiserfs on bottom)
/dev/sde5 218757056 176814592 41942464 81% /mnt/www
/dev/sdd1 732549604 117493932 615055672 17% /mnt/pba-web
Is this normal?
Thanks,
Michael
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