113: Destroying Performance
Talking pools in OpenZFS Mastery, which means yet again talking about blocks and sectors and alignment.
GPT partitions fill a number of sectors. If you partition a drive assuming 512-byte sectors, you can easily create a partition that would not cleanly start and end on 4K sector boundaries. Take a drive that has 4K sectors, but claims to have 512-byte sectors. Create a partition that fills, say, seven 512-byte sectors, then add another partition that fills the rest of the drive. Make a ZFS pool with 4K blocks on that large partition. Each filesystem block touches two physical sectors. The…
The skinny
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