HPE Storage Users Group

A Storage Administrator Community




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: StatPD and idle Disks
PostPosted: Sun Jul 15, 2018 11:14 pm 

Joined: Tue Nov 29, 2016 10:26 pm
Posts: 8
Hey Guys,

just playing with a few performance commands having a look see if anything interesting or odd showed up and low and behold it did..

a whole heap of SSD disks idle on one of the 2 ports (not all them mind), maybe nothing but I found it strange.. none of our other disks have this occurrence..

any thoughts or suggestions appreciated (no adaptive flash cache setup)


Attachments:
statpd.PNG
statpd.PNG [ 20.6 KiB | Viewed 13839 times ]
Top
 Profile  
Reply with quote  
 Post subject: Re: StatPD and idle Disks
PostPosted: Mon Jul 16, 2018 10:28 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1570
Location: Europe
If Express Layout isn't triggered, all traffic to that disk will come from one node.

What is your hardware config and CPG settings.

_________________
The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.


Top
 Profile  
Reply with quote  
 Post subject: Re: StatPD and idle Disks
PostPosted: Mon Jul 16, 2018 5:03 pm 

Joined: Tue Nov 29, 2016 10:26 pm
Posts: 8
MammaGutt wrote:
If Express Layout isn't triggered, all traffic to that disk will come from one node.

What is your hardware config and CPG settings.



So hardware wise we have 3 shelves, 1 NL, 1 Half Full with SSD and 1 50/50 SSD and FC disk.

we have 6 CPG's, 1 for each disk type for direct presented LUN's and 1 for each disk type for AO, which is how most of our disks are presented.

SSD Settings:

Direct Settings:
Device type SSD 150K
Raid type RAID 5
Availability
Requested Magazine (Lower)
Current Magazine (Lower)
Set size 5 data, 1 parity
Step size 64 KiB
Preferred chunklets Fast
Disk filter -t r5 -ha mag -ssz 6 -p -devtype SSD -rpm 150

AO Settings:
Device type SSD 150K
Raid type RAID 5
Availability
Requested Magazine (Lower)
Current Magazine (Lower)
Set size 3 data, 1 parity
Step size 64 KiB
Preferred chunklets Fast
Disk filter -t r5 -ha mag -ssz 4 -p -devtype SSD -rpm 150


Top
 Profile  
Reply with quote  
 Post subject: Re: StatPD and idle Disks
PostPosted: Tue Jul 17, 2018 12:45 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1570
Location: Europe
So you have 24 SSDs and 2 nodes?

_________________
The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.


Top
 Profile  
Reply with quote  
 Post subject: Re: StatPD and idle Disks
PostPosted: Wed Jul 18, 2018 6:25 pm 

Joined: Tue Nov 29, 2016 10:26 pm
Posts: 8
MammaGutt wrote:
So you have 24 SSDs and 2 nodes?



20 SSD's over 2 nodes


Top
 Profile  
Reply with quote  
 Post subject: Re: StatPD and idle Disks
PostPosted: Thu Jul 19, 2018 2:36 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1570
Location: Europe
Then that would give 10 SSDs per node (assuming correct physical placement and identical capacity) and that shouldn't trigger Express Layout for your config.

I would trigger a tunesys to see if that would even it out and fix the problem.

_________________
The views and opinions expressed are my own and do not necessarily reflect those of my current or previous employers.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 


Who is online

Users browsing this forum: No registered users and 57 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group | DVGFX2 by: Matt