I am assuming you want to implement everything under one Pool.
Considering choosing RAID, you need to check few factors between RAID10 vs RAID6
Disk utilization
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RAID 10: No matter how many disks the RAID 10 comprises, it only utilizes half space of the disks, because the other half capacity of a RAID 10 array will always be dedicated to protection (backup).
RAID 6: Its disk utilization is more than 50%. If the RAID 6 array comprises four disks, only 50% of that space is usable capacity, but the proportion of usable space increases as you add more drives. For example, if the number of disks in a RAID 6 array is increased to eight, the space utilization would increase to 75% (only 25% of space is used for parity data).
Reliability
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RAID 10: Whether RAID 10 can handle two disk failures simultaneously depends on where they occur. If both failed disks are located in one mirrored set, the data will be lost and the Pool will stop work. If the failed disks are not located in the same mirrored set, even if half of disks fail, you can ensure MSA operational and then rebuild RAID 10.
RAID 6: RAID 6 can ensure the normal operation of the MSA when any two disks fail simultaneously. And then, you can replace these failed disks to rebuild RAID 6.
Performance
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Write speed always faster than RAID6 because no parity calculation overhead, read speed also faster. Rebuild speed faster compared to RAID6 because it just need to rebuild or copy data from mirror set whereas in RAID6 need to calculate parity to rebuild data.
Now one important point to remind you as you are planning to build RAID1 Performance tier with 2 SSD drives. The moment one SSD drive failed System will automatically drain all pages from SSD to next spinning drive tier which is configured. Provided you have sufficient space available in spinning tier. This occurs because similar wear across the SSDs is likely, so more failures may be imminent.
Hope this helps!
Regards
Subhajit
I am an HPE employee
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