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- Apr 16, 2020
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I have been doing a lot of reading in an attempt to understand 4Kn, 512e and ashift=12
I have a bunch of disks (Seagate Exos 12TB) that are 512/4096 logical / physical. They are in an existing pool with ashift=12
smartctl -i /dev/ada4 shows up as
Sector Sizes: 512 bytes logical, 4096 bytes physical
Which I think means formatted 512
However I understand that ashift=12 means that ZFS is using the physical sector size of 4K - but surely the data is being stored in the old 512 way
Also, anyone know what the implications of having a ashift=9 vdev (SLOG) attached to this pool would be? The Optane 900p at first glance to be seems to be 512 only with no support for 4Kn
I have a bunch of disks (Seagate Exos 12TB) that are 512/4096 logical / physical. They are in an existing pool with ashift=12
smartctl -i /dev/ada4 shows up as
Sector Sizes: 512 bytes logical, 4096 bytes physical
Which I think means formatted 512
However I understand that ashift=12 means that ZFS is using the physical sector size of 4K - but surely the data is being stored in the old 512 way
Also, anyone know what the implications of having a ashift=9 vdev (SLOG) attached to this pool would be? The Optane 900p at first glance to be seems to be 512 only with no support for 4Kn