3PAR Users Group

A Storage Administrator Community




Post new topic Reply to topic  [ 4 posts ] 
Author Message
 Post subject: CPG Raid change and tuning
PostPosted: Fri Oct 18, 2019 4:00 pm 

Joined: Fri Oct 18, 2019 3:46 pm
Posts: 3
Is it safe to use a CPG where the Raid level is modified ?
The data is tuned to a new cpg. Can it be tuned back to the original cpg which is modified to new Raid ? Will there be any data corruption or inconsistency or any impact ?


Top
 Profile  
Reply with quote  
 Post subject: Re: CPG Raid change and tuning
PostPosted: Sat Oct 19, 2019 1:21 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 989
Location: Europe
No problem.

If you just wanted to change RAID on the CPG you could simply have changed it and run tunesys to change for all existing data.

CPG configuration is used when creating LDs (basically writing new data). If you change a CPG configuration it will be used for all new data while the old continues to have the old config. Even that is not a problem. And tunesys will ensure that all data (new and old) is stored according to current CPG configuration.

_________________
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: CPG Raid change and tuning
PostPosted: Thu Oct 24, 2019 4:34 pm 

Joined: Fri Oct 18, 2019 3:46 pm
Posts: 3
MammaGutt wrote:
No problem.

If you just wanted to change RAID on the CPG you could simply have changed it and run tunesys to change for all existing data.

CPG configuration is used when creating LDs (basically writing new data). If you change a CPG configuration it will be used for all new data while the old continues to have the old config. Even that is not a problem. And tunesys will ensure that all data (new and old) is stored according to current CPG configuration.


Top
 Profile  
Reply with quote  
 Post subject: Re: CPG Raid change and tuning
PostPosted: Sun Oct 27, 2019 5:49 pm 
Site Admin
User avatar

Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1226
Location: Dallas, Texas
CPG is a policy that defines how new logical disks are created. When you edit the CPG, the existing data will remain at the old settings, and data written to new LDs will take the new settings. You can run a tunecpg after making a change to convert move the old data into new LDs and remove the old empty LDs.

_________________
Richard Siemers
The views and opinions expressed are my own and do not necessarily reflect those of my employer.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 


Who is online

Users browsing this forum: Google [Bot], MSN [Bot] and 27 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