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January 5th, 2021 11:00
Confusion with array configuration capacity
Hi,
I have an EqualLogic ps6110 with 7x 400GB SSD and 17x 600GB spinning disk that I setup a few hours ago.
For some reason I was expected to see 13TB Raw Capacity but the group manager is showing total capacity of 9.1TB.
Will I see a bigger size once the RAID status reach 100%.
Bellow is my screenshot
Can anyone please confirm what the total capacity of my array should be?
Thank you
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dwilliam62
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January 5th, 2021 12:00
That configuration will create TWO RAID6 RAIDsets One for the SSDs and the other for the SAS drives. Plus a spare for the SAS. So that's 5 total drives for parity and spares.
The size won't change at 100%. Also some space is set aside from each drive. So the SSDs are about 1.8TB The Spinning drives will be around 7.7TB So that's correct.
Regards,
Don
fred974
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January 5th, 2021 15:00
@dwilliam62 thank you again for your help.
I have now reach the volume creation part.
Do you have any recommendation for me? I am currently think to do something like this:
I have never used the snapshot reserve before so I have no idea on what value to give it.
The EqualLogic is used as a shared storage for 4 xcp-ng hypervisor and I have around 4TB of storage on all VM combine.
I do not use anything else, the array is purely for xcp-ng
dwilliam62
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January 6th, 2021 11:00
Hello,
The amount of reserve depends on how much write activity you have an how long you want to keep snapshots around. If you wanted to keep a years worth you would have to potentially allocate more than the size of the volume. Much less if you just want to have some for a few days or before major events. Resize, end of quater, end of year.
Re: Volume. I have found that multiple smaller volumes perform better than one massive volume. There are a number of reasons for this based on how SCSI works.
Regards,
Don
fred974
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January 6th, 2021 15:00
Hi @dwilliam62 ,
I only just seen your reply. I have already create a large volume of 6TB. I tried to reduce it but it look like it is not possible.
Do you think 6TB is a 'large' volume?
dwilliam62
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January 7th, 2021 07:00
Hello,
It's not the "size" that's important. It's that there is only one. Like only having a single checkout in a store. At times there will be a line at that register. If you had two or four registers working there wouldn't be a backup
If you haven't written much to that volume you can thn provision it. Create a smaller volume also thin provisioned and move the VMs to the smaller volume. Then delete the 6TB volume create a another smaller one and move VMs there. Depending on the capability of your hypervisor and how much space you have used so far.
Regards,
Don