Roch
what's the minimum allocation size for a file in zfs? I get 1024B by
my calculation (1 x 512B block allocation (minimum) + 1 x 512B inode/
znode allocation) since we never pack file data in the inode/znode.
Is this a problem? Only if you're trying to pack a lot files small
byte files in a limited amount of space, or if you're concerned about
trying to access many small files quickly.
VxFS has a 96B "immediate area" for file, symlink, or directory data;
NTFS can store small files in the MFT record; NetApp WAFL can also
store small files in the 4KB inode (16 Block pointers = 128B?) .. if
you look at some of the more recent OSD papers and some of the Lustre/
BlueArc work you'll see that this topic comes into play for
performance in pre-fetching file data and locality issues for
optimizing heavy access of many small files.
---
.je
On Feb 20, 2007, at 05:12, Roch - PAE wrote:
Sorry to insist but I am not aware of a small file problem
with ZFS (which doesn't mean there isn't one, nor that we
agree on definition of 'problem'). So if anyone has data on
this topic, I'm interested.
Also note, ZFS does a lot more than VxFS.
-r
Claude Teissedre writes:
Hello Roch,
Thanks for your reply. According to Iozone and Filebench
(http://blogs.sun.com/dom/), ZFS is less performant than VxFS for
smalll
files and more performant for large files. In you blog, I don't see
specific infos related to small files -but it's a very interesting
blog.
Any help from CC: people related to Perforce benchmark (not in
techtracker) is welcome.
Thanks,
Clausde
Roch - PAE a écrit :
Salut Claude.
For this kind of query, try zfs-discuss@opensolaris.org;
Looks like a common workload to me.
I know of no small file problem with ZFS.
You might want to state your metric of success ?
-r
Claude Teissedre writes:
Hello,
I am looking for any benchmark of Perforce on ZFS.
My need here is specifically for Perforce, a source manager. At
my ISV, it handles 250 users simustaneously (15 instances on
average)
and 16 Millions (small) files. That's an area not covered in the
benchmaks I have seen.
Thanks, Claude
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
