VTAM® issues this message as part of a message group in response to a DISPLAY BFRUSE,BUFFER=SHORT command. A complete description of the message group follows.

 IST350I DISPLAY TYPE = BUFFER POOL DATA
 IST632I BUFF       BUFF    CURR    CURR    MAX    MAX     TIMES  EXP/CONT   EXP
 IST633I  ID        SIZE    TOTAL   AVAIL   TOTAL  USED    EXP    THRESHOLD  INCR
 IST356I bpid[Q][F] bufsize curtot curavail maxtot maxused times  exp/cont   incr
 IST449I limitname = csa, CURRENT = current, MAXIMUM = maxlevel
 IST790I MAXIMUM type USED = maxK
[IST449I CSA24 = csa, CURRENT = current, MAXIMUM = maxlevel]
[IST790I MAXIMUM type USED = maxK]
 IST595I IRNLIMIT = irnlimitK, CURRENT=currentirnK MAXIMUM = maximumirnK
 IST981I VTAM PRIVATE: CURRENT = currentK, MAXIMUM USED = maximumK
 IST314I END

IST350I

• This message identifies the type of information shown in the display. For this message group, type is always BUFFER POOL DATA.

IST632I and IST633I

• These messages are header messages for the information displayed in message IST356I.

IST356I

• bpid is the name of the buffer pool. See the z/OS Communications Server: SNA Network Implementation Guide for an explanation and description of buffer pools and for general information on buffer pool specification and allocation.
  • Q, if present, indicates that a request is queued for this pool. This field is usually blank.
  • F, if present, indicates that dynamic buffering has failed. This field is usually blank.
• bufsize is a decimal value that indicates the number of bytes in each buffer.
  • For IOBUF an overhead value of 87 bytes should be added to the bufsize value in this message. See the z/OS Communications Server: SNA Resource Definition Reference for information on buffer pool default sizes.
• curtot is a decimal value that indicates the total number of buffers in the pool.
• curavail is a decimal value that indicates the number of available buffers that are currently not in use.
• maxtot is a decimal value that indicates the highest number of buffers contained in this pool at any one time since the last buffer pool trace record was written.
• maxused is a decimal value that indicates the highest number of buffers in use at any one time since the last buffer pool trace record was written.
• times is a decimal value that indicates how many times this pool has been expanded since the last buffer pool trace record was written. If the value of times is greater than 99999, ***** is displayed in this field.
• exp is a decimal value used for triggering expansion.
  • If the number of buffers not in use falls below this value, VTAM adds additional buffers. This field contains N/A if dynamic buffering has been suppressed.
• cont is a decimal value used for triggering contractions.
  • If the number of available buffers becomes larger than this value, VTAM checks the availability of dynamically obtained buffers. If available, VTAM releases those buffers. However, for any available buffer to be released, every buffer on the same page must also be available since buffers are released in pages.
  • This value is defined only when the buffer pool is in expansion mode. If blanks appear in the display, the buffer pool is not currently in expansion mode.
  • If dynamic buffering has been suppressed, this column contains N/A.
• incr is a decimal value that indicates how many buffers are to be added to the buffer pool during dynamic expansion.
  • Buffers are added in full pages. Thus, this number might be larger than the number used when defining the buffer pool. If dynamic buffering is not available, this field contains N/A.

IST449I, IST790I, IST595I, and IST981I subgroup

• See IST449I for a description of this message subgroup.