From: Kefu Chai Date: Fri, 10 Jan 2020 09:29:35 +0000 (+0800) Subject: doc/man: improve bluefs-bdev-expand option X-Git-Tag: v15.1.0~266^2 X-Git-Url: http://git-server-git.apps.pok.os.sepia.ceph.com/?a=commitdiff_plain;h=refs%2Fpull%2F32590%2Fhead;p=ceph.git doc/man: improve bluefs-bdev-expand option Signed-off-by: Kefu Chai --- diff --git a/doc/man/8/ceph-bluestore-tool.rst b/doc/man/8/ceph-bluestore-tool.rst index 0ad5c20c3d60..2bc951ebd13c 100644 --- a/doc/man/8/ceph-bluestore-tool.rst +++ b/doc/man/8/ceph-bluestore-tool.rst @@ -48,7 +48,7 @@ Commands :command:`bluefs-export` - Export the contents of BlueFS (i.e., rocksdb files) to an output directory. + Export the contents of BlueFS (i.e., RocksDB files) to an output directory. :command:`bluefs-bdev-sizes` --path *osd path* @@ -56,7 +56,13 @@ Commands :command:`bluefs-bdev-expand` --path *osd path* - Instruct BlueFS to check the size of its block devices and, if they have expanded, make use of the additional space. + Instruct BlueFS to check the size of its block devices and, if they have + expanded, make use of the additional space. Please note that only the new + files created by BlueFS will be allocated on the preferred block device if + it has enough free space, and the existing files that have spilled over to + the slow device will be gradually removed when RocksDB performs compaction. + In other words, if there is any data spilled over to the slow device, it + will be moved to the fast device over time. :command:`bluefs-bdev-new-wal` --path *osd path* --dev-target *new-device*