Dell MD3600i Disk Group expansion

Question

Hi All,

Our Dell MD3600i storage consists three expansion enclosures.

Total Disks = 48 (Including RAID Enclosure-0)

Below said two disk groups were created with protection of RAID-6,

Disk_Group_0 = 30 SAS 600GB 15K RPM Drives
Disk_Group_1 = 14 SAS 600GB 15K RPM Drives
Hot Spare = 02 SAS 600GB 15K RPM Drives
SSD_Cache = 02 SSD 400GB Drives

We have 5 vDisks carved out from "Disk_Group_0" and 6 vDisks carved out from "Disk_Group_1"

Free Space details:

Disk_Group_0 = 799GB free out of 15.269TB
Disk_Group_1 = 1426.476GB free out of 6700.876GB

We have purchased MD1200 expansion enclosure with 12* SAS 600GB 15K RPM Drives.

we planned to expand both disk groups with 6 drives each.

Is there any production impact during disk group expansion?

Is there a chance for performance issue to occur existing vDisk access?

How long will take expansion to complete?

After the expansion, manual defragment is required?

Regards,

Dhakshinamoorthy Balasubramanian

http://www.storageadmin.in/

DELL-Sam L · Answer

Hello Dhakshinamoorthy,

When you do a disk group expansion it is a low priority task so there is very minimal impact to production. Now there is a small chance that you will see a little bit of a performance impact but it shouldn’t be much as the expansion is not a top priority. As far as how long it will take to complete that is hard to say as I have seen in some cases that it takes only a few hours & then for other customers it has taken them a few weeks to complete. The time really depends on how much the SAN is being accessed. You do not need to manual defragmenting after the virtual disk expansion has finished.

Please let us know if you have any other questions.

PowerVault

Dell MD3600i Disk Group expansion

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