Click here to monitor SSC
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Physical Disk Performance Measurement


Physical Disk Performance Measurement

Author
Message
hemant.chaurasia-942319
hemant.chaurasia-942319
Forum Newbie
Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)Forum Newbie (2 reputation)

Group: General Forum Members
Points: 2 Visits: 237
Hello,

We have a typical RAID 10 (2+2) configuration with 4 HDD on one of our production database server where I observed in perfmon for the drive which is configured with RAID 10 configuration.

Avg. Disk Read Queue Length - 12.51
Avg. Disk Write Queue Length - 0.06

Somewhere I read , I should divide these figures with the no of spindles. Now the question is , should I divide these values by 4 or 2 and what should I interprete from these values ?

Thanks,
Hemant
Toby Harman
Toby Harman
SSC-Addicted
SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)SSC-Addicted (481 reputation)

Group: General Forum Members
Points: 481 Visits: 668
I would suggest the answer is two..

Either you have mirrored two spindles two times and then striped the resulting array (RAID 1+0) is which case everything that happens to one spindle MUST happen to the other synchronously or you have striped two spindles two times and then mirrored the results (RAID 0+1), in which case a single write will also have to be written to two physical spindles.

BTW - doing the mirror 1st and then the stripe actually increases your reliability once you get to 6 spindles.
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search