IBM AIX Continuous Availability Features - IBM Redbooks

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Machine State Save Area iar : 000000000044F1F8 msr : 8000000000009032 cr : 44028028 lr : 00000000000544D0 ctr : 8000000000F958A0 xer : 00000000 mq : 00000000 asr : 000000025F20D001 amr : F3FC000000000000 r0 : 0000000000000001 r1 : 0FFFFFFFF3FFFDF0 r2 : 0000000002D45C30 r3 : 0000000000000000 r4 : 0000000000000000 r5 : 000000000000003F r6 : 0000000000000000 r7 : 0000000000000001 r8 : 0000000000000000 r9 : 0000000000000000 r10 : 00000000000000FF r11 : 00000000000000FF r12 : 0000000000000006 r13 : F100060800820400 r14 : 00000000DEADBEEF r15 : 0000000000000002 r16 : 00000000000A1C50 r17 : 0000000000000000 r18 : 00000000020AF366 r19 : 00000000000034C8 r20 : 0000000002A2B580 r21 : 0000000000000000 r22 : F100080710800078 r23 : F100010007FA5800 r24 : 00000000020B7EF4 r25 : 0000000000000000 r26 : 0000000000000000 r27 : 0000000002570900 r28 : 00000000025708FE r29 : 00000000020B7E70 r30 : F10006C001356000 r31 : 00000000020B71C0 prev 0000000000000000 stackfix 0000000000000000 int_ticks 0000 cfar 0000000000003708 kjmpbuf 0000000000000000 excbranch 0000000000000000 no_pfault 00 intpri 0B backt 00 flags 00 hw_fru_id 00000001 hw_cpu_id 00000002 (0)> hks F3FC000000000000 hkey 2 RW PUBLIC hkey 7 RW PROC INTR VMM LFS CRED LDR KER (0)> Example 3-37 shows the hardware keys for a page frame table (PFT) entry. Example 3-37 Hardware keys for current PFT (0)> pft 1 Enter the page frame number (in hex): 1000 VMM PFT Entry For Page Frame 0000001000 of 000027FFFF ptex = 0000000000000800 pvt = F200800040010000 pft = F200800030060000 h/w hashed sid : 0000000000000 pno : 0000000100 psize : 64K key : 3 s/w hashed sid : 0000000000000 pno : 0000000100 psize : 64K s/w pp/noex/hkey : 3/0/02 wimg : 2 > in use > on scb list > valid (h/w) > referenced (pft/pvt/pte): 0/0/0 > modified (pft/pvt/pte): 1/0/0 base psx.................. 01 (64K) soft psx.................. 00 ( 4K) owning vmpool............. 00000000 owning mempool............ 00000000 owning frameset........... 00000002 source page number............ 0100 dev index in PDT.............. 0000 next page sidlist. 0000000000002C10 prev page sidlist. 0000000000001010 next page aux......... 000000000000 prev page aux......... 000000000000 waitlist.......... 0000000000000000 logage.................... 00000000 nonfifo i/o............... 00000000 next i/o fr list...... 000000000000 110 IBM AIX Continuous Availability Features
(0)> more (^C to quit) ? 3.7.9 Storage keys performance impact 3.8 ProbeVue Kernel keys (protection gates) have some impact on system performance because they add overhead to the functions that contain them, whether they are implicit gates used by key-unsafe extensions, or explicit gates you use to make your extension key-aware. AIX provides a mechanism to disable kernel keys for benchmarking and environments where the kernel key performance loss is unacceptable. If you make a key-safe extension by simply adding the minimal entry and exit point protection gates, it might actually run slightly faster than it otherwise would on a keys-enabled system, because explicit gates do not use the context stack. You must trade off granularity of protection against overhead as you move into the key-protected realm, however. For example, adding protection gates within a loop for precise access control to some private object might result in unacceptable overhead. Try to avoid such situations, where possible, in the framework of your specific key-protected design. Introduced in AIX V6.1, ProbeVue is a facility that enables dynamic tracing data collection. A tracing facility is dynamic because it is able to gather execution data from applications without any modification of their binaries or their source codes. The term “dynamic” refers to the capability to insert trace points at run-time without the need to prepare the source code in advance. Inserting specific tracing calls and defining specific tracing events into the source code would require you to recompile the software and generate a new executable, which is referred to as a static tracing facility. Currently there are no standards in the area of dynamic tracing. POSIX has defined a tracing standard for static tracing software only as described in Chapter 1 of the IBM Redbooks publication IBM AIX Version 6.1 Differences Guide, SG24-7559. So, no compatibility between ProbeVue and other UNIX dynamic tracing facilities can be expected until a standard is established. Dynamic tracing benefits and restrictions Software debugging is often considered as a dedicated task running on development systems or test systems trying to mimic real customer production systems. However, this general statement is currently evolving due to the recent advances in hardware capabilities and software engineering, such as: ► The processing and memory capabilities of high-end servers with associated storage technologies have lead to huge systems into production. ► Dedicated solutions developed by system integrators (for example, based on ERP software) implement numerous middleware and several application layers, and have lead to huge production systems. ► Software is now mostly multithreaded and running on many processors. Thus, two runs can behave differently, depending on the order of thread execution: multithreaded applications are generally non-deterministic. Erroneous behaviors are more difficult to reproduce and debug for such software. Chapter 3. AIX advanced continuous availability tools and features 111
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Front cover IBM AIX Continuous Avai
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Note: Before using this information
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2.3.7 Minidump . . . . . . . . . .
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vi IBM AIX Continuous Availability
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Trademarks The following terms are
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Engineering degree in Computer Scie
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Find out more about the residency p
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1.1 Overview In May 2007, IBM intro
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1.5 Continuous operations Continuou
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1.6.2 Availability 1.6.3 Serviceabi
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IBM has tried to enhance FFDC featu
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10 IBM AIX Continuous Availability
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2.1 System availability AIX is buil
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On AIX 5.3, the only way to persist
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When used on a standalone server (s
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mirrored volume group on the client
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2.2.1 Error checking Run-Time Error
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The PowerPC hardware gives software
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System dumps can also be user-initi
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Live dumps are small dumps that do
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Trace is a valuable tool for observ
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Component Trace uses mechanisms sim
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2.3.14 syslog To display the boot l
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Logging can be added to many of the
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compression: on path specification:
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2.4.4 EtherChannel network traffic
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2.4.6 2-Port Adapter-based Ethernet
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operations) without affecting produ
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Quorum A quorum is a vote of the nu
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2.5.8 Journaled File System-related
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Fast I/O failure is controlled by a
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display its output in a format suit
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For more detailed information about
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54 IBM AIX Continuous Availability
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3.1 AIX Reliability, Availability,
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This means that traditional AIX sys
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Page 76 and 77: also be used to obtain a snapshot o
Page 78 and 79: 3.5 Live dump and component dump Li
Page 80 and 81: lfs filesystem ._0 | NO | ON/3 | OF
Page 82 and 83: .vmker | YES | ON/3 | OFF/3 .vmpool
Page 84 and 85: The output of Start a Live Dump is
Page 86 and 87: Table 3-3 Concurrent update termino
Page 88 and 89: We tested the installation of an ef
Page 90 and 91: Setting efix state to: STABLE +----
Page 92 and 93: mode, storage keys are called user
Page 94 and 95: Example 3-19 shows the SMIT menu fo
Page 96 and 97: might share a given hardware key. M
Page 98 and 99: KKEY_UPUBLIC, KKEY_FILE_DATA KKEY_U
Page 100 and 101: Note: Kernel keys and keysets, whic
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Page 104 and 105: added a protection gate for the int
Page 106 and 107: } printf("hardware keyset after KER
Page 108 and 109: } param=atoi(*(argv+1)); printf("Te
Page 110 and 111: Load the kernel extension so that a
Page 112 and 113: 3 : 000000000000000A r4 : F10006C00
Page 114 and 115: 3.7.7 User mode protection keys Use
Page 116 and 117: ► The APIs provided by the system
Page 118 and 119: if (!strcmp(*(argv+1),"read")){ if
Page 120 and 121: strlen() at 0xd010da00 _doprnt(??,
Page 122 and 123: int pthread_attr_setukeyset_np (pth
Page 126 and 127: As a consequence, determining the r
Page 128 and 129: A Vue script or Vue program is a pr
Page 130 and 131: ► An optional predicate The predi
Page 132 and 133: 3. Interval probe manager The inter
Page 134 and 135: { int count; count = count +1; prin
Page 136 and 137: ► Errno names ► Signal names
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Page 140 and 141: This places a large part of the bur
Page 142 and 143: Note: The frequency of checks made
Page 144 and 145: Non-fragments 00000066 Promotions 0
Page 146 and 147: immediately after the returned stor
Page 148 and 149: This option should be used with car
Page 150 and 151: 3.9.6 KDB commands for XMDBG ► xm
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Page 154 and 155: Name AIX version Hardware required
Page 160 and 161: Online resources These Web sites ar
Page 162 and 163: sysdumpdev 27 tprof 28 trace 28 trc
Page 164: subsequent reboot 71, 133 SUE 18 Sy
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