HPE EVA Storage

MSA1000 RAID 5 expand limitation ?

Occasional Contributor

MSA1000 RAID 5 expand limitation ?


I want to expand my RAID 5 Array in my MSA1000.

We have 4 Array sets 3 are raid 1+0 one is Raid 5.

The RAID 5 array is composed in 12 drive of 18.2 GB and I would like expand to 18 drive of 18.2.

When I expand my Logical unit, I check 295 GB but at the end, I have only 261 GB online.

Is there a limitation on the disk number by logical unit ? Must I reboot my server or the MSA1000 and retry ?

Thanks for your help.
Steven Clementi
Honored Contributor

Re: MSA1000 RAID 5 expand limitation ?

Let me see if I understand you correctly...

You have an MSA1000 with one Array of 12 18.2GB hdd's. (@216GB RAW).

In this Array, you have 4 logical drives...

3 are RAID1+0 and 1 is RAID5. What are the sizes?

You want to add an additional 6 18.2GB hdd's (@108 RAW) (total RAW is 320GB).

Remember the RAID over head. If you expanding a RAID5 logical drive, you will lose about 15 to 20 % of the available space to parity. If your expanding RAID1, then you lose HALF your abailable space.

Let me know if you are having a different issue.

Steven Clementi
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
NPP3 (Nutanix Platform Professional)
Occasional Advisor

Re: MSA1000 RAID 5 expand limitation ?

hi guys

i will ask another question i have 2 arrays on msa1000 one of them contain 3 logical volumes raid5 i extended the space on one of the logical volumes but the leveling was done on the 3 logical volumes so i didn't undestand. why can you help me please?

Johan Guldmyr
Honored Contributor

Re: MSA1000 RAID 5 expand limitation ?

Ilay23: It would be easier to explain if you showed your setup (which logical drives in which array) is and which logical drive you expanded. Also if you maybe could say more specifically what you did that would help.


Leveling - where did you see this? Does it actually say 'leveling' too?