Good Day,
We have an IQ 15.4 ESD#3 running on Red Hat 5.5 on Linux which is attached to an old EMC Symmetrix SAN.
Usually during peak day hours , say 9:00am-noon and 3:00pm - 5:00pm (basically all day)we have monitored using top and iostat with the outputs like these ones(in average) :
16 core machine
CPU %user %system %iowait
all 35.92 83.00 60.15
iostat output is attached(please see)
If you look at avgqu-sz , await* ,svctm and %util we see values that according to Linux information idcicate that there is a disk bottleneck problem which causes top to show alow %user time and a high system% time
Also there are some lack of HG indexes that should be created , but we are not sure that this could fully end the i/o problem
Could you confirm this analysis?
Note: Regarding "svctm" , when running "man iostat", there is a note which states: "Do no trust this field anymore". This field will be removed in a future sysstat version"--does this mean we sholud ignore this parameter?
Thank you
Regards
Jose-Miguel