HPE Storage Users Group

A Storage Administrator Community




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: 3par only with fully provisioned virtual volumes
PostPosted: Mon Oct 18, 2021 5:02 am 

Joined: Tue Oct 05, 2021 4:35 am
Posts: 7
We are planniing to use 3par only with fully provisioned vv-s.

Is there any guidance available how much disk space should we leave free for the 3par to operate normally?


Top
 Profile  
Reply with quote  
 Post subject: Re: 3par only with fully provisioned virtual volumes
PostPosted: Mon Oct 18, 2021 6:47 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 1570
Location: Europe
carlos1800 wrote:
We are planniing to use 3par only with fully provisioned vv-s.

Is there any guidance available how much disk space should we leave free for the 3par to operate normally?


As long as you plan to replace failed drives when they fail and are not going to use snapshots or replication I would say 99.9%.

_________________
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: 3par only with fully provisioned virtual volumes
PostPosted: Mon Oct 18, 2021 7:26 am 

Joined: Wed Nov 09, 2011 12:01 pm
Posts: 392
Also depending if you plan to never expand the size of a VV, even if it fills up, without buying more disks (consider the turn around time for an order and if there are constraints on parts).

You'd need to have a very stable application environment, without upgrades/updates to manage that though or lots of free space on every VV. ;)


Top
 Profile  
Reply with quote  
 Post subject: Re: 3par only with fully provisioned virtual volumes
PostPosted: Tue Oct 19, 2021 2:49 am 

Joined: Tue Oct 05, 2021 4:35 am
Posts: 7
ailean wrote:
Also depending if you plan to never expand the size of a VV, even if it fills up, without buying more disks (consider the turn around time for an order and if there are constraints on parts).

Just to confirm: If we buy new disks to increase the storage capacity, and 99% of the 3par storage capacity is used by fpvv-s, the expansion of a vv is still possible? Ie. the system doesn't requires some headspace for the growvv to complete?


Top
 Profile  
Reply with quote  
 Post subject: Re: 3par only with fully provisioned virtual volumes
PostPosted: Tue Oct 19, 2021 3:35 am 

Joined: Wed Nov 09, 2011 12:01 pm
Posts: 392
By default all disk space becomes a single pool of space, so when you add new disks they will just expand the pool, allowing growth of any VV.

There are a few things to take into consideration though, if you want to expand a VV by 1TB don't just buy 1TB of new raw disk. You have to take into account a small amount of system space on each disk, a chunk of spare space on each disk and a percentage of parity space for the VV.

Once new disks are added you may also need to spread the data out so it evenly distributed across all disks, this is often automated but might take a little while depending on how busy the system is.

Personally I'd probably aim at a 90-95% fill with the fpVVs just so there's some margin, the system can rebalance data depending on performance usage but that does require a bit of free space. It also allows you to expand a VV in an emergency if needed.

HPE do have sizing tool called NinjaSTARS, it allows you to build virtual 3PAR system and play with the number of disks, RAID setting etc and gives a reasonable estimate of the actual usable disk space to expect (it does include savings from thin provisioning, compression and dedupe but you can turn most of that off to see what fpvv would provide).


Top
 Profile  
Reply with quote  
 Post subject: Re: 3par only with fully provisioned virtual volumes
PostPosted: Wed Oct 20, 2021 7:23 am 

Joined: Tue Oct 05, 2021 4:35 am
Posts: 7
Great, thanks.


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 33 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