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rit1

1 Rookie

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19 Posts

3680

August 1st, 2019 06:00

traditional pool expansion in Unity 300F-

We have Unity 300 F ,running with 4.3.1 code version. We have created traditional pool with 10 disks, where we need to expand pool due to low capacity in pool, so can you help me to find below quires 1: I did not find any option to figure which RAID type pool uses ,So how to identify which RAID type used by pool 2: If pool uses a RAID Type (RAID5-8+1),then should I need to buy 9 disks and add to pool for Expansion ? or is it ok if we add additional few more disks (let’s assume 5 disks) to pool, then will it re-balance RAID5 from 8+1 to RAID 5-12+1 ? Please someone can help on this to clarify doubts for expansion of pool

AndreD Dell

Moderator

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239 Posts

August 7th, 2019 05:00

Hi @rit1 

So:

1 - Raid type should be in the pool properties in the GUI. Under pool properties > last tab called RAID

2 - yes, best practices say you should expand the pool in similar increments and in the same form factor (for traditional pools). So if your pool is R5 8+1, then you should expand with the same.

If you expand with different form factors, one of two things will happen: the system will not let you, or it might but then you end up with a miscontructed pool and you may have different performance depending on where your data is.

Data will be rebalanced, but the pool will not recreate the internal RGs the way you suggest below.

I would strongly advise that you check the Unity docs before doing this in a live production system, because once you put the drives in the pool there is no going back.

 

 

DELL_ChrisHolloway

2 Intern

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125 Posts

August 6th, 2019 02:00

1- uemcli /stor/config/pool show -detail will show you the RAID level of a pool. 2 - In a traditional pool, you must expand by a full RG, so if your RAID modulus is 8+1 then you need to add 9 disks. Adding less than this will not cause the pool to change it's RAID level (that's not possible on Unity). Since you're adding the same number of disks again, have you considered adding the new disks as a dynamic pool and migrating over to it? Once you'd migrated everything from your current traditional pool you can destroy it and add the disks to the dynamic pool, and so gain the benefit of single drive additions in the future.

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