diff options
| author | George Amanakis <[email protected]> | 2020-04-10 13:33:35 -0400 |
|---|---|---|
| committer | GitHub <[email protected]> | 2020-04-10 10:33:35 -0700 |
| commit | 77f6826b83b7e27f0996f6d192202c36f65e41fd (patch) | |
| tree | b9946c99348bf6742cc41739aeff1a2b952d9d2f /man/man8/zdb.8 | |
| parent | 36a6e2335c45212f2609269bcee3004908ac6bcb (diff) | |
Persistent L2ARC
This commit makes the L2ARC persistent across reboots. We implement
a light-weight persistent L2ARC metadata structure that allows L2ARC
contents to be recovered after a reboot. This significantly eases the
impact a reboot has on read performance on systems with large caches.
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: George Wilson <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Co-authored-by: Saso Kiselkov <[email protected]>
Co-authored-by: Jorgen Lundman <[email protected]>
Co-authored-by: George Amanakis <[email protected]>
Ported-by: Yuxuan Shui <[email protected]>
Signed-off-by: George Amanakis <[email protected]>
Closes #925
Closes #1823
Closes #2672
Closes #3744
Closes #9582
Diffstat (limited to 'man/man8/zdb.8')
| -rw-r--r-- | man/man8/zdb.8 | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/man/man8/zdb.8 b/man/man8/zdb.8 index 8506d5478..3915be3f8 100644 --- a/man/man8/zdb.8 +++ b/man/man8/zdb.8 @@ -212,18 +212,24 @@ If specified multiple times, display counts of each intent log transaction type. Examine the checkpointed state of the pool. Note, the on disk format of the pool is not reverted to the checkpointed state. .It Fl l Ar device -Read the vdev labels from the specified device. +Read the vdev labels and L2ARC header from the specified device. .Nm Fl l will return 0 if valid label was found, 1 if error occurred, and 2 if no valid -labels were found. Each unique configuration is displayed only once. +labels were found. The presence of L2ARC header is indicated by a specific +sequence (L2ARC_DEV_HDR_MAGIC). Each unique configuration is displayed only +once. .It Fl ll Ar device -In addition display label space usage stats. +In addition display label space usage stats. If a valid L2ARC header was found +also display the properties of log blocks used for restoring L2ARC contents +(persistent L2ARC). .It Fl lll Ar device -Display every configuration, unique or not. +Display every configuration, unique or not. If a valid L2ARC header was found +also display the properties of log entries in log blocks used for restoring +L2ARC contents (persistent L2ARC). .Pp If the .Fl q -option is also specified, don't print the labels. +option is also specified, don't print the labels or the L2ARC header. .Pp If the .Fl u |