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RAID 6 vs RAID10 from SSD on LSI 2208?
Good afternoon.
There is a SuperMicro server in DC. RAID controller - LSI 2208.
I'm going to put VmWare ESXi under motley VMs.
Now there is a choice -
RAID6 from 6 and SSD on 500Gb.
RAID10 of 4 x 1000Gb SSDs
Net capacity and here and there I will get 2 gigabytes.
With RAID6, the write (read) speed will be lower. more operations are performed, but ANY two drives can fail.
With RAID10, the speed will be higher and in my configuration it is possible for two disks to fail, but not from one mirror. But I will have room for two more SATA drives in RAID1, where I can add backups of important information from virtual machines.
This is what I know in theory. Tell us in practice (applicable to these types of RAID and specifically SSD) what will be the percentage run-up in performance (maybe there are some similar configurations), in order to understand whether it is worth paying for reliability or not?
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Percentages depend on the controller and on the disks. I'll ask you a leading question:
Are you doing a raid in order to
1) not lose data when disks fail?
2) stay afloat when disks fail?
The matter is that the RAID array solves only the second task. To solve the first problem, you need to make backups. Therefore, it is preferable to assemble an array of 4 disks, and use the remaining two for backups.
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