----- Original Message ----- From: "Igor Schein" igor@txc.com To: toasters@mathworks.com Sent: Thursday, November 30, 2000 4:07 PM Subject: quota overhead
Hi,
I'm thinking to implement quotas on the filer, but the one thing which concerns me is NFS performance. Can any1 try to quantify quota system's degradation effect on NFS performance? Please elaborate as much as you can.
The impact of performance is very minimal; less than 10%. Just turn on the quotas and see for yourself; if you don't like the impact, you can always turn them back off.
There is a bug, 17233, which says:
The filer uses a quota hash table with 1024 elements. On a filer with many quotas, the code which looks up quotas needs to scan long lists of quotas, which can result in heavy CPU usage, particularly while resizing quotas, but also during ordinary file system operations and while handling rquota requests on behalf of client quota commands.
I don't see any indication that this bug has been fixed or that more elements have been added in more recent releases such as version 6.0.
Bruce