About cookies on this site Our websites require some cookies to function properly (required). In addition, other cookies may be used with your consent to analyze site usage, improve the user experience and for advertising. For more information, please review your options. By visiting our website, you agree to our processing of information as described in IBM’sprivacy statement. To provide a smooth navigation, your cookie preferences will be shared across the IBM web domains listed here.
|
Programming Interface Information:
This information is NOT
intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only. |
DX1BK
Cross Reference (Contains links to field and bit definitions)
DX1BK Prolog
NAME : HCPDX1BK
DESCRIPTION: Minidisk extent index level 1.
DSECT : DX1BK
FUNCTION : A DX1BK entry points to a DX2BK which can contain
up to 128 minidisk extents.
LOCATED BY : MPEDX1BK - HCPMPEBK pointer to DX1BK.
CREATED BY : HCPMSMIP When a Diagnose 244 is issued by the user.
DELETED BY : HCPAMD44 During an identify pool function the
previous DX1BK will be deleted if any.
HCPMSMDP During storage reset operation.
COMMENTS :
DX1BK Control Block Content
DX1BK DSECT
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure DX1BK Minidisk extent index level 1. 0000 0 Signed 4 DX1HPRBN Highest PRBN contained in the second level page. ****************------- 00000004 DX1LENET *-DX1HPRBN Length of this entry. 0004 4 Signed 4 DX1NXTET (511) Next entry in this block. 0800 2048 Address 3 DX1DX2BK Address of the second level page which contains up to 128 minidisk extents. Bits 0-23 are used as an address. ****************------- 0803 2051 Bitstring 1 DX1PGECT Count of entries in a DX2BK block starting with 1. Zero indicates an empty DX2BK block. ****************------- 00000004 DX1LENE2 *-DX1DX2BK Length of this entry. 1111 1111 DX1CTMSK X'000000FF' Mask to isolate count. 00FFFF00 DX1DX2AM X'FFFFFF00' Mask to isolate DX2BK address. 0804 2052 Signed 4 DX1DX2NT (511) Next entry in this block. 00000200 DX1NUMET 4096/(DX1LENET+DX1LENE2) Number of entries in the DX1BK.
DX1BK Storage Layout
*** DX1BK - Minidisk extent index level 1. * * +---------------------------+---------------------------+ * 0 | DX1HPRBN | | * +---------------------------+ | * 8 | | * = DX1NXTET = * | | * +--------------------+------+---------------------------+ * 800 | DX1DX2BK |:PGECT| | * +--------------------+------+ | * 808 | | * = DX1DX2NT = * | | * +-------------------------------------------------------+ *1000 * *** DX1BK - Minidisk extent index level 1.
DX1BK Cross Reference
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----DX1CTMSK 0803 FF
DX1DX2AM 0803 00FFFF00
DX1DX2BK 0800
DX1DX2NT 0804
DX1HPRBN 0000
DX1LENET 0000 00000004
DX1LENE2 0803 00000004
DX1NUMET 0804 00000200
DX1NXTET 0004
DX1PGECT 0803
Last updated on 3 Aug 1999 at 11:54:04 EDT.
Copyright IBM Corporation, 1990, 1999