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@@ -82,17 +82,25 @@ The installation part is highly specific to Debian 10 (Buster). The backports re
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### Pools
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- Recommended pool options:
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- - Set physical block/sector size: `ashift=<9|12>`
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+ - Typical example: `-o ashift=<9|12> -O compression=zstd -O xattr=sa -O atime=off -O relatime=on`
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+ - Specifying options during creation: For `zpool`/pools, use `-o` for pool options and `-O` for dataset options. For `zfs`/datasets, use `-o` for dataset options.
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+ - Set physical block/sector size (pool option): `ashift=<9|12>`
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- Use 9 for 512 (2^9) and 12 for 4096 (2^12). Use 12 if unsure (bigger is safer).
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- - Enable compression: `compression=zstd`
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+ - Enable compression (dataset option): `compression=zstd`
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- Use `lz4` for boot drives (`zstd` booting isn't currently supported) or if `zstd` isn't yet available in the version you're using.
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- - Store extended attributes in the inodes: `xattr=sa`
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- - `on` is default and stores them in a hidden file.
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- - Relax access times: `atime=off` and `relatime=on`
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+ - Store extended attributes in the inodes (dataset option): `xattr=sa`
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+ - The default is `on`, which stores them in a hidden file.
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+ - Relax access times (dataset option): `atime=off` and `relatime=on`
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- Don't enable dedup.
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- Create pool:
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- Format: `zpool create [options] <name> <levels-and-drives>`
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- - Basic example: `zpool create -o ashift=<9|12> -O compression=zstd -O xattr=sa <name> [mirror|raidz|raidz2|...] <drives>`
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+ - Basic example: `zpool create [-f] [options] <name> [mirror|raidz|raidz2|...] <drives>`
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+ - Use `-f` (force) if the disks aren't clean.
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+ - See example above for recommended options.
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+ - The pool definition is hierarchical, where top-level elements are striped.
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+ - RAID 0 (striped): `<drives>`
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+ - RAID 1 (mirrored): `mirror <drives>`
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+ - RAID 10 (stripe of mirrors): `mirror <drives> mirror <drives>`
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- Create encrypted pool: See encryption section.
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- Use absolute drive paths (`/dev/disk/by-id/` or similar).
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- View pool activity: `zpool iostat [-v] [interval]`
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Nordstrand