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doc/rados/bluestore: Documentation for Interpreting spillover cleaner stats

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Signed-off-by: Jaya Prakash <jayaprakash@ibm.com>
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Jaya Prakash 2026-07-23 01:45:59 +05:30
parent 0152782bfe
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doc/rados/bluestore/bluefs-spillover-cleaner.rst
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@ -80,21 +80,66 @@ Example output:
{ {
"Files Migrated": [ "Files Migrated": [
... ...
"db.wal/000052.log size=0x24cd21 migrated=0x1200000 from dev=2->1 ts=2026-06-02T12:44:25.488250+0000", "db/000084.sst size=0xf8cd6 migrated=0x100000 from dev=2->1 ts=2026-07-22T18:49:42.555723+0000",
"db.wal/000053.log size=0x3696ad migrated=0x1200000 from dev=2->1 ts=2026-06-02T12:44:25.833014+0000", "db/000086.sst size=0xfdd34 migrated=0x100000 from dev=2->1 ts=2026-07-22T18:49:42.595349+0000",
"db.wal/000054.log size=0x1571f61 migrated=0x2400000 from dev=2->1 ts=2026-06-02T12:44:26.134245+0000", "db.wal/000078.log size=0x19de2e2 migrated=0x2400000 from dev=2->1 ts=2026-07-22T18:49:42.694700+0000",
"db.wal/000055.log size=0x1b2b508 migrated=0x2400000 from dev=2->1 ts=2026-06-02T12:44:26.550633+0000" "db.wal/000079.log size=0x19d32f7 migrated=0x2400000 from dev=2->1 ts=2026-07-22T18:49:43.424059+0000",
"db.wal/000080.log size=0xd1a637 migrated=0x1200000 from dev=2->1 ts=2026-07-22T18:49:44.204353+0000",
"db.wal/000081.log size=0xcbeaf5 migrated=0x1200000 from dev=2->1 ts=2026-07-22T18:49:44.618457+0000",
"db.wal/000082.log size=0xd6737 migrated=0x1200000 from dev=2->1 ts=2026-07-22T18:49:44.892949+0000",
"db.wal/000083.log size=0x696fe8 migrated=0x1200000 from dev=2->1 ts=2026-07-22T18:49:45.279432+0000"
], ],
"pending_files": [ "pending_files": [
"db.wal/000056.log", "db.wal/000091.log",
"db.wal/000057.log", "db.wal/000092.log",
"db.wal/000058.log", "db.wal/000093.log",
"db.wal/000059.log", "db.wal/000094.log",
"db.wal/000060.log", "db.wal/000095.log",
... ...
] ],
"active_files": [
"db.wal/000085.log num_writers=1",
"db.wal/000087.log num_writers=1",
"db.wal/000088.log num_writers=1",
"db.wal/000089.log num_writers=1",
"db.wal/000090.log num_writers=1"
],
"last_scan_time": "2026-07-22T18:51:15.895644+0000"
} }
Interpreting Cleaner Stats
==========================
The spillover cleaner operates in repeated scan cycles of alternating Active and Idle phases.
The output of ``ceph tell osd.N bluefs spillover cleaner stats`` shows the
current cycle state and migration history of spillover cleaner.
``Files Migrated``
Contains a list of entries for files that have been recently migrated from the slow device
to the DB device.
Example entry::
db/000084.sst size=0xf8cd6 migrated=0x100000 from dev=2->1 ts=2026-07-22T18:49:42.555723+0000
``pending_files``
At the beginning of each cycle, the spillover cleaner scans for files on the slow device and adds them to ``pending_files``.
These files are later processed one by one.
- Successfully migrated files are removed from ``pending_files`` and added
to ``Files Migrated``.
- Files open for write are removed from ``pending_files`` and reported
in ``active_files`` for that cycle.
A new scan is performed at the beginning of the next cycle.
``active_files``
Contains files that have active writers when the cleaner attempted to
migrate them. Migration of these files are skipped during the current cycle.
``last_scan_time``
Shows the time of the most recent cleaner scan.
Testing Testing
======= =======