Example 8-1 Using MULTIUSE and DISMOUNT Keywords (I)
$ SET SHADOW DSA1/POLICY=HBMM=(MASTER=*,COUNT=12,MULTIUSE=12,DISMOUNT=1)
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In this example, a policy is set in which all 12 bitmaps can
be used as multiuse bitmaps. When you execute the command DISMOUNT/POLICY=MINICOPY, 1 minimerge bitmap is converted
to multiuse bitmap. You can use this multiuse bitmap with the MINICOPY command to add the dismounted member back to the
shadow set. In other words, it specifies that all 12 bitmaps can be
used during the automatic and 1 bitmap during the manual removal of
the shadow set member.
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$ SHOW SHADOW
_DSA1: Volume Label: DDD
Virtual Unit State: Steady State
Enhanced Shadowing Features in use:
Host-Based Minimerge (HBMM)
Automatic Minicopy (AMCVP)
Dismount uses Multiuse Bitmaps
VU Timeout Value 3600 VU Site Value 0
Copy/Merge Priority 5000 Mini Merge Enabled
Recovery Delay Per Served Member 30
Merge Delay Factor 200 Delay Threshold 200
HBMM Policy
HBMM Reset Threshold: 1000000
HBMM Master lists:
Up to any 12 nodes in the cluster - Multiuse: 12 Dismount: 1
HBMM bitmaps are active on NODEA,KRISNA,MEERAA
Modified blocks since bitmap creation: 0
Device $1$MDA50 Master Member
Read Cost 1 Site 0
Member Timeout 120
Device $1$MDA51
Read Cost 1 Site 0
Member Timeout 120
$ SHOW DEV/BIT
Device BitMap Size Percent Type of Master Active
Name ID (Bytes) Populated Bitmap Node
DSA1: 000A0001 12 0.01% Minimerge NODEA Yes
000A0002 12 0.01% Minimerge KRISNA Yes
00090003 12 0.01% Minimerge MEERAA Yes
$ SHOW DEV DSA1
Device Device Error Volume Free Trans Mnt
Name Status Count Label Blocks Count Cnt
DSA1: Mounted 0 DDD 10139 1 3
$1$MDA50: (NODEA) ShadowSetMember 0 (member of DSA1:)
$1$MDA51: (NODEA) ShadowSetMember 0 (member of DSA1:)
NODEA$dismount $1$MDA51:/poli=mini
$ SHOW DEV/BIT
Device BitMap Size Percent Type of Master Active
Name ID (Bytes) Populated Bitmap Node
DSA1: 000A0001 12 0.01% Multiuse NODEA Yes
000A0002 12 0.01% Minimerge KRISNA Yes
00090003 12 0.01% Minimerge MEERAA Yes
$
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Example 8-2 Using MULTIUSE and DISMOUNT Keywords (II)
$ SET SHADOW DSA10/POLICY=HBMM=((MASTER=(*),COUNT=12,MULTIUSE=12,DISMOUNT=12)) |
In this example, a policy is set in which all 12 bitmaps can
be used as multiuse bitmaps. When you execute the command DISMOUNT/POLICY=MINICOPY, 12 minimerge bitmaps are converted
to multiuse bitmaps. You can use this multiuse bitmap with the MINICOPY command to add the dismounted member back to the
shadow set. In other words, it specifies that 12 bitmaps can be used
during the automatic or manual removal of the shadow set member.
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$SHOW DEVICE DSA10/BIT
Device BitMap Size Percent Type of Master Active
Name ID (Bytes) Populated Bitmap Node
DSA10: 00010085 6196 0.01% Minimerge LEXUS Yes
00010086 6196 0.01% Minimerge DARWIN Yes
00010087 6196 0.01% Minimerge NAPALM Yes
00010088 6196 0.01% Minimerge SPIFF Yes
00010089 6196 0.01% Minimerge CALVIN Yes
0001008A 6196 0.01% Minimerge LOPEZ Yes
0001008B 6196 0.01% Minimerge OBELIX Yes
0001008C 6196 0.01% Minimerge KRUSTY Yes
0001008D 6196 0.01% Minimerge GIMLI Yes
0001008E 6196 0.01% Minimerge HOMER Yes
0001008F 6196 0.01% Minimerge OOTY Yes
00010090 6196 0.01% Minimerge HOBBES Yes
$DISMOUNT $1$DGA4996: /POLICY=MINI
$SHOW DEVICE DSA10/bit
Device BitMap Size Percent Type of Master Active
Name ID (Bytes) Populated Bitmap Node
DSA10: 00010085 6196 0.01% Multiuse LEXUS Yes
00010086 6196 0.01% Multiuse DARWIN Yes
00010087 6196 0.01% Multiuse NAPALM Yes
00010088 6196 0.01% Multiuse SPIFF Yes
00010089 6196 0.01% Multiuse CALVIN Yes
0001008A 6196 0.01% Multiuse LOPEZ Yes
0001008B 6196 0.01% Multiuse OBELIX Yes
0001008C 6196 0.01% Multiuse KRUSTY Yes
0001008D 6196 0.01% Multiuse GIMLI Yes
0001008E 6196 0.01% Multiuse HOMER Yes
0001008F 6196 0.01% Multiuse OOTY Yes
00010090 6196 0.01% Multiuse HOBBES Yes
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When the minicopy completes and the dismounted member is added
back to the shadow set, the “multiuse” bitmap is converted
to the “minimerge” bitmap.
$SHOW DEVICE DSA301/BIT
Device BitMap Size Percent Type of Master Active
Name ID (Bytes) Populated Bitmap Node
DSA301: 00010085 6196 0.01% Minimerge LEXUS Yes
00010086 6196 0.01% Minimerge DARWIN Yes
00010087 6196 0.01% Minimerge NAPALM Yes
00010088 6196 0.01% Minimerge SPIFF Yes
00010089 6196 0.01% Minimerge CALVIN Yes
0001008A 6196 0.01% Minimerge LOPEZ Yes
0001008B 6196 0.01% Minimerge OBELIX Yes
0001008C 6196 0.01% Minimerge KRUSTY Yes
0001008D 6196 0.01% Minimerge GIMLI Yes
0001008E 6196 0.01% Minimerge HOMER Yes
0001008F 6196 0.01% Minimerge OOTY Yes
00010090 6196 0.01% Minimerge HOBBES Yes
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The following example shows that using any further commands
to create bitmaps fails because all the 12 bitmap slots are utilized.
$DISM $1$DGA4993: /POLICY=MINI
%DISM-W-CANNOTDMT, $1$DGA4993: cannot be dismounted
%SYSTEM-F-WBMERR, WBM error during dismount
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