[DRBD-user] Reducing iowait

Robinson, Eric eric.robinson at psmnv.com
Wed Oct 13 00:34:49 CEST 2010

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

I'm happy with the performance of our DRBD clusters. They have scaled
very well. One of our older drbd 8.0.14 clusters is pretty busy these
days servicing about 130 separate instances of MySQL and is seeing
bursts of 10-30% iowait, sometimes more, for maybe 3-4 seconds at a
time. Someone told me I could increase performance and reduce iowait by
mounting the ext3 filesystem with the "noatime" option. Are there any
dangers to be concerned about when mounting a drbd device using the
noatime option?

Eric Robinson

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