Operating OnLine 3-63

Monitor Blobs in a Blobspace

Monitor Blobs in a Blobspace
DB-Monitor measures blobspace availability by providing the number of
used disk pages in the chunk. Thetbstat -ddisplay attempts to describe the
the number of blobpages used. The tbcheck -pB display provides the most
accurate assessment of current blobspace storage efficiency.
From DB-Monitor
FromDB-Monitor, select the Status menu, Spaces option.
The first screen display lists the blobspace ID number, the name of the
blobspace, the number of assigned chunks, and the mirroring status of the
blobspace. If an asterisk appears next to the Mirror field, one of the chunks
in this blobspace is down. Select the blobspace that you want to monitor.
The second screen display lists the following chunk information for each
dbspace:
■Chunk ID
■Chunk pathname and offset
■Mirror status flags
■Pages in the chunk
■Number of used disk pages in the chunk
Ifa chunk is mirrored, both the primary chunk and the mirror chunk shared
the same chunk ID number.
The chunk status flags are defined as follows:
Flag Description
- Chunk belongs to a dbspace.
B Chunk belongs to a blobspace.
D Chunk is down, no reads or writes can occur.
M Mirror chunk.
O Chunk is online.
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