You could start off by collecting more data. for disks I suggest you use the following command
statit
command. Have a look at what it does. If you are under support warranty I d get a capture of data from statit
and log a case with support for them to review it unless you are confident about reading the data. you could
also post it here for us to take a look into. Do the following:
When the slowness is occuring:
statit -b
priv set advanced
sysstat -m 1
wait for 1 minute
ctrl-c (to end sysstat)
statit -e (to end statit)
grab all the output in a txt file and attach it to here and/or to tech support.
Eric