Statistics (for server)
davecb at canada.sun.com
Thu Feb 10 19:04:19 GMT 2000
Peter Polkinghorne wrote:
> it is hard to know what your Samba server is doing.
> But I have no measure of how active such clients are. But what
> would be good measures?
> I can think of Data transfered, packets exchanged and may be counts of
> operations by type - but that might be too large for SMB (cf nfsstat).
SMBD is a classical server, which is also dependent
on other servers.
The interesting values are
1) number of connections
2) latency of a read/write request,
from beginning of request to beginning
of data transfer
3) throughput of a read/write request, from
the beginning to the end of the transfer
4) latency and throughput of the underlying
read/write request, the one that usually
is a read(2) from a disk.
After this come a whole bunch of things which
tell you queue backups, latency of individual
operations and the rest of the nfsstat-like stuff.
For a performance guru, the first four will get them
started, and the rest of the information they'll need
initially is discoverable from system stats.
A caveat: all of these are easy to collect, but
are both hard to aggregate and expensive to printf
individually to the logs. It makes sense to write
a little stats module, and a program to probe it
and capture/format the data. That way you can
collect the important things and defer doing the
other stuff until you need to measure an individual
--dave (who has ended up a performance analyst several times,
entirely by accident) c-b
David Collier-Brown, | Always do right. This will gratify some people
185 Ellerslie Ave., | and astonish the rest. -- Mark Twain
Willowdale, Ontario | //www.oreilly.com/catalog/samba/author.html
Work: (905) 415-2849 Home: (416) 223-8968 Email: davecb at canada.sun.com
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