I’m sorry I missed it.
I have two disks, one of which is iscsi. no raid configuration. Active services are dns, dhcp, mail, spam, ftp, vpn, firewal, isp, webserver, database, antivirus, ldap and backup.
[root@gateway ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 465.3G 0 part
├─centos_gateway-root 253:0 0 459.4G 0 lvm /
└─centos_gateway-swap 253:1 0 5.9G 0 lvm [SWAP]
sdf 8:80 0 500G 0 disk
└─sdf1 8:81 0 500G 0 part
└─centos_gateway_iscsi-data 253:2 0 500G 0 lvm /data
sr0 11:0 1 1024M 0 rom
[root@gateway ~]# free -m
total used free shared buff/cache available
Mem: 5798 2967 474 158 2357 2304
Swap: 6015 291 5724
My only suspect is related to the backup module.
In the last days, I received some notification emails from the system indicating that another backup was in progress.
Can the process linked to the backup module generate a high Wait-IO on the second CPU?