Update cheatsheets

linux/ceph

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ceph
+
+> A unified storage system.
+> More information: <https://ceph.io>.
+
+- Check cluster health status:
+
+`ceph status`
+
+- Check cluster usage stats:
+
+`ceph df`
+
+- Get the statistics for the placement groups in a cluster:
+
+`ceph pg dump --format {{plain}}`
+
+- Create a storage pool:
+
+`ceph osd pool create {{pool_name}} {{page_number}}`
+
+- Delete a storage pool:
+
+`ceph osd pool delete {{pool_name}}`
+
+- Rename a storage pool:
+
+`ceph osd pool rename {{current_name}} {{new_name}}`
+
+- Self-repair pool storage:
+
+`ceph pg repair {{pool_name}}`