high i/o dirs

[Cameron Simpson]

On 21Aug2011 20:38, Robert Arkiletian <robark at gmail.com> wrote:
| Rebuilding an nfs fileserver.  I want to put the high i/o directories
| on a separate raid 1 array for performance. Currently everything is
| under / in one raid 10 array.
| How can I tell which directories, obviously other than /home, are
| getting high reads and/or writes? Any tools to measure read/write i/o
| per directory?

Since nobody else has replied, perhaps you should look at the
inotifywatch command. Disclaimer: I've never used it.

"man inotifywatch" says:

    DESCRIPTION
       inotifywatch listens for filesystem  events  using  Linux's inotify(7)
       interface,  then outputs a summary count of the events received on
       each file or directory.

    OUTPUT
       inotifywatch will output a table on standard out with  one column  for
       each type of event and one row for each watched file or directory. 
       The table will show the amount  of  times  each  event  occurred  for
       each watched  file or directory.  Output can be sorted by a particular
       event using the -a or -d options.

Looks promising.

You might also consider what fielsystem to use for your new partition.
For example, XFS makes a deliberate attempt to store files physically
close to their directories for performance reasons.

Cheers,
-- 
Cameron Simpson <cs at zip.com.au> DoD#743
http://www.cskk.ezoshosting.com/cs/

Microsoft - where "cross platform" means "runs in both Win95 and WinNT".
        - Andy Newman <andy at research.canon.com.au>