This message is the first in a group of messages that VTAM® issues in response to a DISPLAY BFRUSE command. This message displays information about VTAM common service area (CSA) usage. A complete description of the message follows.

 IST449I  limitname = csa, CURRENT = current, MAXIMUM = maxlevel
 IST790I  MAXIMUM type USED = maxK
 IST1667I SYSTEM CSA LIMIT = sys_csa_limit
 IST1831I percent OF SYSTEM CSA STORAGE REMAINING = sys_csa_avail
[IST449I  CSA24 LIMIT = 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
 IST924I -------------------------------------------------------------
 IST1565I type    MODULES = currentK
 IST1565I type    MODULES = currentK
 IST1565I type    MODULES = currentK
 IST314I  END

IST449I

• limitname is either CSALIMIT (the request is to set the CSA limit) or CSA24 LIMIT (the request is to set the CSA limit for 24-bit addressable storage).
• csa is the maximum amount of the particular type of CSA that VTAM can use for buffers. Limits are enforced on the requested amount of storage, but csa can be NO LIMIT, which means VTAM can request as much as is available.
• current is the current VTAM CSA allocation for buffers.
• maxlevel is the largest CSA allocation level for buffers since the last DISPLAY BFRUSE command.

IST595I

• irnlimit is the maximum amount of VTAM storage that can be used for intermediate routing node slowdown traffic.
• currentirn is the amount of storage currently in use for intermediate routing node slowdown traffic.
• maximumirn is the largest allocation level since the last DISPLAY BFRUSE command.

IST790I

• type can be one of the following:

  CSA

  31-bit and 24-bit addressable common storage

  CSA24

  24-bit addressable common storage

• maxK is the maximum amount of type ever in use for buffers since VTAM was started.

IST981I

• This message shows the private storage (both above and below the 16M line) that VTAM explicitly acquires (with GETMAIN).
• currentK is the amount of VTAM private storage currently in use. This does not include the amount of private storage required to load the VTAM modules.
• maximumK is the maximum amount of VTAM private storage ever in use since VTAM was started.

IST1565I

• type can be one of the following:

  CSA

  31-bit and 24-bit addressable common storage acquired for VTAM modules

  CSA24

  24-bit addressable common storage acquired for VTAM modules

  PRIVATE

  Private storage used to load VTAM modules

• currentK is the current VTAM CSA/ECSA allocation for modules.

IST1667I

• sys_csa_limit is the maximum amount of system CSA and is determined by adding the total amount of CSA and ECSA defined in the system. The maximum amount that VTAM will use is derived by multiplying the sys_csa_limit by 0.9 (in other words, VTAM will never use more than 90 percent of the total CSA for the system). See z/OS Communications Server: SNA Resource Definition Reference for more information about how the system CSA limit relates to the CSALIMIT Start Option.

IST1831I

• percent is the percentage of system CSA plus Extended CSA available for use.
• sys_csa_avail is the current total amount of system CSA plus Extended CSA available for use.