Best way to measure disk bandwidth usage
cswiger at mac.com
Wed Nov 7 10:04:48 PST 2007
On Nov 7, 2007, at 9:41 AM, Andrea Venturoli wrote:
> iostat is also expecially interesting, since it can run non-
> interactively and I could poll it through cacti...
> However this monitors only raw da devices. Is there a way to get
> gmirrors monitored?
If they are visible as "drive devices", then yes, iostat can be passed
a list of devices to monitor instead of the top-level physical devices
it was showing by default.
> Finally this gives overall MB/s, which is very interesting, but I'd
> also need to refer this to an end-of-scale value, in order to
> understand if the disks are working to their fullest (and thus are
> the bottleneck).
> Is this correct? Where could I desume such a value? (I remember
> there was an utility... though I don't remember its name).
diskinfo -vt _device_
...will give you some transfer rate numbers, but note the BUGS section
of the manpage. :-)
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