No subject

partition in question add up to more that 20, and the %b is about 60%
consistantly, then you have a disk bottleneck.

Adding memory, will, of course, likely help, regardless of what the
problem really is. 128mb is quite a small amount, and even if it's not
actively swapping processes, discarding executable pages, or writing
anyomous memory to the paging file, there's not going to be much left
for the FS page cache, and you'll see a lot more IO's that you should.

As for increasing performance:
Mount the volume "noatime"
Add ram:
Add disk: 6 drives, configured as 3 mirrors, with a stripe volume
accross the top, will give you quite impressive IO/per sec rates. But it
really depends on what you have now!
Use VxFS. The veritas filesystem requires gnerally requires fewer
metadata updates than VxFS, and is better at batching IO's together.
Benchmarks for heavy Clearcase activitiy saw a 15% improvement in
performance on VxFS.


-----


From: Bruce McAllister
Max block size curretly on UFS (as far as I am aware) is 8K, you cannot
create a block size bigger than that. If you are creating this on a mail
server it may be advisable to create a smaller block size as the general
mail message is not that big and you will be wasting space on the
filesystem. It may be benificial to check your mail message size over a
period and base you block size on the average size of a message.


-----


From: Wolfgang Kandek
try enabling priority paging on the old system. Under heavy file I/O Solaris
can swap out executables to make space for more file caching. Priority
paging prevents this.

take a look at this link for some information:
http://www.sun.com/sun-on-net/performance/priority_paging.html

-- 
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Jeff D. Allen, BCSc  ---------------------------------------------
Systems Administrator		Faculty of Computer Science
Dalhousie University		6050 University Ave. Halifax NS
Email: allen at cs.dal.ca		Web: http://www.cs.dal.ca/
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