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тАО06-30-2003 11:02 AM - last edited on тАО08-24-2014 10:02 PM by Maiko-I
тАО06-30-2003 11:02 AM - last edited on тАО08-24-2014 10:02 PM by Maiko-I
High CPU WIO on backup server?
We have an N4000 with 4 CPU's and 6.1 GB RAM running HP-UX 11.11. This machine is used for backups. Sar and BMC Patrol data show that the "CPU WIO" is 90-99% when the machine is busy. I wonder if this indicates a real performance problem or if this is an artifact from sar and Patrol not being able to read the performance data accurately. Glance is not installed on this box.
P.S. This thread has been moved from Disk to HP-UX > sysadmin. - Hp forum Moderator
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тАО06-30-2003 11:20 AM
тАО06-30-2003 11:20 AM
Re: High CPU WIO on backup server?
Seems as the processes is waiting for I/O, this indicates a I/O bottleneck rather then a cpu bottleneck. Is it possible for you to describe your enviroment more in detail (backup application, number of clients, backup devices etc.)
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тАО07-01-2003 03:14 AM
тАО07-01-2003 03:14 AM
Re: High CPU WIO on backup server?
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тАО07-01-2003 04:00 AM
тАО07-01-2003 04:00 AM
Re: High CPU WIO on backup server?
A high wio value when running backup does not nessecary indicates any bottleneck, rather that backup applications is I/O intensive more then cpu intensive. I run a test backup on our OmniBack server (A400, SAN LTO library, local disk) and got wio figures of 85 to 95% (but normal backup performance). If your backup performance seems normal (depending on the drive type and amount of data you backup) I dont think you need to worry.