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 Post subject: Different size drives allowed in a RAID set?
PostPosted: Mon Feb 19, 2018 11:21 am 

Joined: Thu Nov 30, 2017 11:20 am
Posts: 70
Location: WI
We have a 7200 3PAR with 6 - 1.92tb SSD drives in it. We want to finish out the cage and get 6 more drives. I was just wondering if I add larger drives will it through off the balance or not. I know that chunklets do a decent job of leveling off but dont want to add any issues If I dont have to.

Thanks.


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 Post subject: Re: Different size drives allowed in a RAID set?
PostPosted: Mon Feb 19, 2018 2:07 pm 
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Joined: Tue Aug 18, 2009 10:35 pm
Posts: 1328
Location: Dallas, Texas
It will throw off the balance a little, but probably not a problem for you, let me qualify that:

I am assuming 6 drives today is delivering acceptable performance.
Adding 6 more drives will potentially double you available performance.
As the 12 drive fill up and grow, the original 6 will fill up first, and will continue to service reads and writes over the data on there, but all new growth will go to the large 6 new drives that have freespace, this for new writes, you will be back to 6 drive's worth of performance.

If you are having performance constraints, this discussion could go in a different direction.

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


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 Post subject: Re: Different size drives allowed in a RAID set?
PostPosted: Tue Feb 20, 2018 2:21 pm 

Joined: Thu Nov 30, 2017 11:20 am
Posts: 70
Location: WI
Thanks for the feedback Richard. That makes a lot of sense. Currently the only reason for upgrade is additional space but I will discuss your points with my team and see what we feel is the best option.


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