Displaying information about a cache area
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Displaying information about a cache area

SmartIO uses a cache area on the SSD devices for caching. Each cache area has attributes such as the cache type, size, association type, the caching state, and the devices used for caching. The cache area also has associated data objects.

For a VxFS cache area, the sfcache list command shows the caching mode for the file or directory. If the mode is not explicitly set, the file or directory inherits the caching mode of the mount point. If the mode is explicitly set for a file or directory, that value persists across remounts. The displayed caching mode may differ from the mode that is enabled for the mount point. The writeback mode is not enabled unless the file system is mounted in writeback mode. If a file or directory is set to writeback mode, but the file system is mounted in another mode, the file or directory inherits the caching mode of the mount point.

To display information about a cache area

  1. Use the following command to display information about the cache areas on the system.
    # sfcache list
    NAME          TYPE SIZE   ASSOC-TYPE STATE  FSTYPE  DEVICE
sfcachearea_1 VxVM 9.91g  AUTO       ONLINE   -     ssd0_2809
sfcachearea_2 VxFS 31.97g AUTO       ONLINE reserve ssd0_0
  2. Use the following command to display information about a specific cache area.

    Example of a VxVM cache area:

    # sfcache list sfcachearea_1 
Cachearea: sfcachearea_1
Assoc Type: AUTO
Type: VxVM
Size: 30.00g
Cacheline Size: 64.00k
Memory Size: 16.00m
State: ONLINE
Layout: CONCAT
Number of Columns: 0

ASSOCIATED DATA OBJECTS:

ASSOC DATAOBJECT NAME   CACHING-MODE  STATE    KSTATE
testdg/testvol1         read          ENABLED  ENABLED
testdg/testvol2         read          ENABLED  ENABLED

    Example of a VxFS cache area:

    # sfcache list sfcachearea_2
Cachearea: sfcachearea_2
Assoc Type: AUTO
Type: VxFS
Size: 7.00g
State: ONLINE
Layout: CONCAT
FStype: default
Number of Columns: 0

FSUUID                     SIZE      MODE       MOUNTPOINT     CACHENAME
a6178a5604a50200577a...    759.0 MB  read       /ora_inst1     sfcachearea_2
0d929856a7d60e003d38...    512.0 MB  writeback  /pdb2          sfcachearea_2
90929856b68800008141...     50.1 MB  read       /fast_recovery sfcachearea_2
02188a569d7e0700567d...        4 KB  nocache    -              sfcachearea_2
31188a5679a90900987d...        4 KB  nocache    -              sfcachearea_2
a55b8a56db160a00fa61...        4 KB  nocache    -              sfcachearea_2
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