Proliant 350G5 What is max "Disk Busy Time %" acceptable, I have 40% on Drive C:

Posted on 2012-09-05
Last Modified: 2012-10-26

This SBS 2003 32 bit server is in heavy use and doen't work very well anymore.
Among other issues I'll noticed that from HP's System Management Home Page that Logical Disk C: "Disk Busy Time %" is 40%.

Is it acceptable at all?
Drive J (which is iSCSI NAS drive the  "Disk Busy Time %" is 8%.
All other drives the "Disk Busy Time %" is 0%.

On C: drive there is System + some applications.
I have pagefiles on drive  E ja F (Internal SATA Dries).
I have 3 iSCSI drives (2 NAS devices).


Question by:RimFire007
    LVL 46

    Accepted Solution

    Disk throughput and I/Os per second is a limited resource.  It is 40% busy because your apps are using 40% of the capability.

    That means you have 60% left, or 60% of the time the disk is doing nothing.  No problem.

    Now PEAK activity, or queue depth > 2 is something more interesting.   what do they say
    LVL 55

    Assisted Solution

    I would agree that queue depth is best at 2 but since it has a RAID controller I'd qualify that as 2 per disk so optimal queue length with 4 disks in the array would be <8. PAge file's normally the problem with SBS2003 and not much you can do about that with max 4GB RAM less some for PCI devices such as video.

    Author Comment


    How to check PEAK activity, or queue depth?

    Rgs, Juha
    LVL 46

    Expert Comment

    perfmon (performance monitor).

    Author Comment



    I'll check it during next week.

    Author Closing Comment

    Since the server went in very bad condition we actually replaced it (chanaged the whole server and migrated from SBS 2003 32bit to SBS 2011 64 bit).

    Thank you for guiding me with disk performace issues.

    Featured Post

    Do You Know the 4 Main Threat Actor Types?

    Do you know the main threat actor types? Most attackers fall into one of four categories, each with their own favored tactics, techniques, and procedures.

    Join & Write a Comment

    This article is an update and follow-up of my previous article:   Storage 101: common concepts in the IT enterprise storage This time, I expand on more frequently used storage concepts.
    The article will include the best Data Recovery Tools along with their Features, Capabilities, and their Download Links. Hope you’ll enjoy it and will choose the one as required by you.
    This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
    This video is in connection to the article "The case of a missing mobile phone (". It will help one to understand clearly the steps to track a lost android phone.

    729 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    19 Experts available now in Live!

    Get 1:1 Help Now