Hi,
on a linux server I have the following :
vmstat 2 10
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 0 675236 39836 206060 1617660 3 3 3 6 8 7 1 1 0
0 4 0 675236 39836 206072 1617668 0 0 0 96 120 147 1 3 96
0 4 0 675236 39836 206072 1617668 0 0 0 24 116 146 0 0 100
1 4 0 675236 39836 206072 1617668 0 0 0 12 115 116 0 0 100
0 4 0 675236 39836 206084 1617668 0 0 0 34 119 139 0 0 100
Then I have 4 process blocked. How can I find them ? Do we have realy a performance probleme ? There is an oracle DB on this server and it hangs up on :
alter system switch logfile

Many thanks before.

if you are in ARCHIVELOG mode the system can hang when you try ALTER SYSTEM SWITCH LOGFILE.
I don't think it is a performance issue, it's an Oracle issue.