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I'm looking for load/usage data for a server in terms of CPU/RAM/network/Disk from OS perspective. The OS is RHEL5. I know sar is able to report system activity info, but the only commands I know are "sar -r -f sa10" and "sar -q -f sa10", and it's in hourly format.

I would like to generate resource (CPU/RAM/network/Disk) usage report over the past month. Is sar able to do this? If yes, how? If no, what tool I can use to generate this quickly.

Example:

11/01/11      runq-sz  plist-sz   ldavg-1   ldavg-5  ldavg-15
11/01/11            0       137      0.00      0.00      0.00
11/02/11            3       139      0.00      0.00      0.00
11/03/11            5       139      0.03      0.01      0.00
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I don't know sar (Is this it?), from what you're describing, it might be advisable to have a look at the whole RRDtool complex. You could for example use collectd to collect the data in rrd ("Round-Robin Database") files; where data means whatever you want to know the usage of. There're lots of plugins already, also for CPU, memory, disk and network utilization. Once you collected the data, you can use some report tool to generate a report, I haven't used any, but the link from above mentions a few, googling yields for example rrd-report which could be useful, too.

Another way would be skipping the RRD part (and its advantages) and using collectd's CSV plugin.

Edit There're lots of monitoring/measuring solutions, I just picked collectd because it supposedly is light on resources.

Caveat: For loooong-time statistics, RRD might not be the best choice as it covers a constant time span sliding window -- see this for an introduction to this database format.

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