Hi, We are a company that want to replace our current storage layout with one that uses ZFS. We have been testing it for a month now, and everything looks promising. One element that we cannot determine is the optimum number of disks in a raid-z pool. In the ZFS best practice guide, 7,9 and 11 disks are recommended to be used in a single raid-z2. On the other hand, another user specifies that the most important part is the distribution of the defaul 128k record size to all the disks. So, the recommended layout would be:
4-disk RAID-Z2 = 128KiB / 2 = 64KiB = good 5-disk RAID-Z2 = 128KiB / 3 = ~43KiB = not good 6-disk RAID-Z2 = 128KiB / 4 = 32KiB = good 10-disk RAID-Z2 = 128KiB / 8 = 16KiB = good What is your recommendations regarding the number of disks? We are planning to use 2 raid-z2 pools with 8+2 disks, 2 spare, 2 SSDs for L2ARC, 2 SSDs for ZIL, 2 for syspool, and a similar machine for replication. Thanks in advance,
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