Update cheatsheets

zpool

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zpool
+
+> Manage ZFS pools.
+> More information: <https://manned.org/zpool>.
+
+- Show the configuration and status of all ZFS zpools:
+
+`zpool status`
+
+- Check a ZFS pool for errors (verifies the checksum of EVERY block). Very CPU and disk intensive:
+
+`zpool scrub {{pool_name}}`
+
+- List zpools available for import:
+
+`zpool import`
+
+- Import a zpool:
+
+`zpool import {{pool_name}}`
+
+- Export a zpool (unmount all filesystems):
+
+`zpool export {{pool_name}}`
+
+- Show the history of all pool operations:
+
+`zpool history {{pool_name}}`
+
+- Create a mirrored pool:
+
+`zpool create {{pool_name}} mirror {{disk1}} {{disk2}} mirror {{disk3}} {{disk4}}`
+
+- Add a cache (L2ARC) device to a zpool:
+
+`zpool add {{pool_name}} cache {{cache_disk}}`