On Fri, 7 Mar 2014 17:50:44 +0800, Indra Pramana <indra@xxxxxxxx> wrote: > > Any advice on how can I start to troubleshoot what might have caused the > degradation of the I/O speed? Does utilisation contributes to it (since now > we have more users compared to last time when we started)? Any optimisation > we can do to improve the I/O performance? You should probably start by hooking up all servers into some kind of statistics gathering software (we use collectd + graphite ) and monitor at least disk stats (latency + iops + octets) and network. Then it is much easier to see potential problems, for example we found failing-but-not-yet-dead disks that sorta kinda worked but their latency was 10x higher than all other disks in machine. Mariusz Gronczewski, Administrator efigence S. A. ul. Wołoska 9a, 02-583 Warszawa T: [+48] 22 380 13 13 F: [+48] 22 380 13 14 E: mariusz.gronczewski@xxxxxxxxxxxx <mailto:mariusz.gronczewski@xxxxxxxxxxxx>
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