03 - Filesystems

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Caching and the barrier/nobarrier option for write-cache enabled volumes.

[ 4.025167] sd 1:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 4.027195] sd 2:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 4.029378] sd 3:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 4.033598] sd 4:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 4.035569] sd 5:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA

Expand on XFS and ZFS (ZFS only in summary as it is limited to bsd style systems)