I have experienced a couple R80.20 MDS log servers swapping, this could include log servers as well. The customers have enough RAM, so the file system cache eats up about 60 % of available memory. Still the system swap is increasing slowly. We are using either GA or ongoing take JHF on both systems. The MDS is neither swapping nor using as much cache as the MLM.
Anyone experiencing the same problem?
Check your swap usage with free/top and sar:
[Expert@mdlog:0]# free -m
total used free shared buff/cache available
Mem: 15921 5505 271 241 10144 9522
Swap: 8189 526 7663
[Expert@mlm:0]# for safile in $safiles; do sar -S -f "/var/log/sa/$safile" |grep Average|awk '{print $3}'; done
0
6160
28746
58714
27729
...
411624
453370
495278
518524