filesystem: 12h to delete 32GB of data

[Ivan Voras]

Olivier Mueller wrote:
> On Wed, 2009-05-06 at 16:15 +0300, Arkadi Shishlov wrote:
>> Its probably "dirhash' that is not enabled or its cache is too small for the task.
> 
> $ sysctl -a |grep dirha
>   UFS dirhash  1262   286K       -  9715683  16,32,64,128,256,512,1024,2048,4096
> vfs.ufs.dirhash_docheck: 0
> vfs.ufs.dirhash_mem: 2087495
> vfs.ufs.dirhash_maxmem: 2097152
> vfs.ufs.dirhash_minsize: 2560
> 
> So it's active, but probably too small as you suggest. Can I update this
> value "on the fly" or does it require a reboot (+ settings in
> loader.conf) ? 

It's a regular sysctl - you can update it on runtime. Try setting it to
8 M and only increase if it needs to be increased.

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