Re: Inode cache tuning

Yonah Russ wrote:
Hi,

I have a number of servers replicating data with rsync. This generates
a lot of IO and I'm sure I can tune the system to perform better.

vmstat -s reports:
606116696253 total name lookups (cache hits 89%)

while kstat -n inode_cache reports:
maxsize 129534
maxsize reached 245984

I have a minimum of about 500MB RAM free

What do you suggest? Increasing ncsize, ufs_ninode? By how much?


You can set in /etc/system

set ncsize=256000

After reboot, ufs_ninode should adapt to this.
If you have Solaris 8, you should also tune

set ufs:ufs_HW=1179648
set ufs:ufs_LW=786432

and turn logging on (in /etc/vfstab).

But this is zombie lifting.
If you really want to boost performance, you should buy
Veritas, or use ZFS on Solaris 10.


--
Michael Tosch @ hp : com
.

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