Re: Bad performance when accessing a lot of small files

On Dec 28, 2007 7:38 PM, Alfred Perlstein <alfred@xxxxxxxxxxx> wrote:

* Alexandre Biancalana <biancalana@xxxxxxxxx> [071225 16:45] wrote:
On 12/21/07, Alfred Perlstein <alfred@xxxxxxxxxxx> wrote:

Have you tried the 'noatime' mount option? That should help.

Yeah, the zfs set atime=off was already done....


Can you provide a histogram of the count of files per directory?

Excuse-me, but I don't understand....

Distribution of files per directory, example:

1000 files in 9 dirs
1001 files in 12 dirs

find /path_to_root/ -type f | sed 's/\/[^/]*$//' | uniq -c | \
awk '{print $1}' | sort -n | uniq -c

That will print out the number of files per dir.

2 98
3 102
1 103
2 105

Ohh yes !! Now I understand....

The problem is that last night the server stop responding and now is
panicing with the message:

ZFS(panic): zfs: allocating allocated segment(offset=2781261201408 size=131072)
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