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| Different size drives allowed in a RAID set? https://3parug.net/viewtopic.php?f=18&t=2802 |
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| Author: | jbguy [ Mon Feb 19, 2018 11:21 am ] |
| Post subject: | Different size drives allowed in a RAID set? |
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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| Author: | Richard Siemers [ Mon Feb 19, 2018 2:07 pm ] |
| Post subject: | Re: Different size drives allowed in a RAID set? |
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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| Author: | jbguy [ Tue Feb 20, 2018 2:21 pm ] |
| Post subject: | Re: Different size drives allowed in a RAID set? |
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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