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January 27th, 2023 04:00
Dell EMC ME5024 Raid advice needed
I need some advice on the allocation of disks in our new Dell EMC ME5024 storage array
- 20x 7.68 TB SAS ISE SSD, read optimized, 12 Gbit/s 512e
It is accessed by 3 vSphere servers via iSCSI 10GbE (about 130 VMs).
I looked again in our offer and saw that our account executive offered us the storage with the following configuration:
20x 7.68TB SSD ADAPT(8+2) 110.59TB Usable 120K IOPS
Now I have read the manual and best practice and everywhere it says that you should split on both controllers.
Since we have 20 SSD we can't set up an ADAPT raid except maybe 12x ADAPT and 8x RAID6.
Would it be better to have 20x ADAPT in POOL A or should I rather have
10x RAID6 POOL A and 10x RAID6 POOL B.
The performance loss when using only one controller would then be about 50%, right?
Cheers
vishvajitd
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February 20th, 2023 04:00
Based on the information provided, you have a Dell EMC ME5024 storage array with 20x 7.68TB SAS ISE SSDs that is accessed by three vSphere servers via iSCSI 10GbE, supporting around 130 VMs. Your account executive offered the storage with a configuration of 20x 7.68TB SSD ADAPT(8+2), providing 110.59TB usable space and 120K IOPS. However, you are unsure whether to use 20x ADAPT in POOL A or split it into 10x RAID6 POOL A and 10x RAID6 POOL B to better allocate disks across both controllers.
According to best practices, it is generally recommended to split disks across both controllers to maximize performance and availability. Since you have 20 SSDs, one option could be to use a combination of ADAPT and RAID6, such as 12x ADAPT and 8x RAID6, as you mentioned.
Alternatively, you could split the disks into two equal pools of 10 disks each, with each pool using RAID6 for data protection. This would allow you to spread the workload across both controllers and minimize the risk of a single point of failure.
Regarding performance loss, it is important to note that using only one controller will result in a performance loss of up to 50% compared to using both controllers. Therefore, it is highly recommended to split the disks across both controllers to ensure maximum performance and availability.
Ultimately, the optimal disk allocation strategy will depend on your specific workload and performance requirements. You may want to consult with a Dell EMC storage expert or your account executive to determine the best approach for your specific use case.