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January 24th, 2023 14:00
ME4084 virtual pool size
The admin guide for the ME4084 says that with the large pools feature enabled, the maximum size for a virtual pool is 1PiB. With the large pools feature disabled (which is default), the max size is only 512 TiB. It also says that you can only have one virtual pool per controller. However, the spec sheet for the ME4084 says that the max raw capacity is 4PB. How do you get 4PB if you can only have 2x1 PiB or 2x512 TiB virtual pools?
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DELL-Erman O
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January 25th, 2023 00:00
Hi, I think this happens due to the difference between usable capacity and raw capacity. Usable capacity is lower than raw capacity because of overheads such as RAID, etc. The ME4084 has a maximum raw capacity of 4PB, but that doesn't mean that all of that capacity can be used in a single virtual pool. When the large pools feature is enabled, the maximum size for a virtual pool is 1PB, and when it's disabled, the maximum size is 512 TB. So, it's important to note that the ME4084 has two controllers, so each controller can support a virtual pool with a maximum size of 1PB or 512 TB, so it's possible to have a total of 2x1 PB or 2x512 TB virtual pools.
Hope that helps!
DB_2022
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January 25th, 2023 11:00
Having done some more reading, I think I’ve found the answer to this one. While you can only have two virtual pools, you can have up to 64 linear pools. So you could have 2 PB taken up by the two virtual pools and the other 2 PB taken up by up to 64 linear pools.
DB_2022
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January 25th, 2023 11:00
Erman,
Thanks for the reply, but you essentially just repeated details of my question back to me. I am aware that the documentation states you can only have a total of 2 x 1 PB (max) pools - that's exactly my point and the reason for my question. It doesn't match with the stated raw capacity being 4PB.
Thanks.