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The SDA extension commands for Extended File Cache (XFC) enable you to display the following information in a convenient and readable format:
You can also control the types of events that are recorded by XFC's
tracing feature.
9.1 SDA XFC Commands
The following pages describe the SDA XFC extension commands.
You can enter XFC commands at the SDA prompt or you can access online help, as follows:
SDA> XFC HELP |
Controls the types of events to be recorded by XFC's trace facility and initializes the trace structures (to eliminate events that have already been recorded).
XFC SET TRACE [/SELECT=LEVEL:level] [/RESET]
None.
/SELECT=LEVEL:level
Specifies the level of tracing in XFC on a live system. The possible values for level are as follows:
1 (Default) Traces only major, unusual events. 2 Traces file access, deacess, truncate, read start and complete, and write start and complete operations. Results are displayed using the SHOW TRACE command. Setting this trace level has only a minor performance impact. 3 Performs more detailed tracing, which can be viewed using the SHOW TRACE/RAW command. Has some performance impact. 4 Performs very detailed tracing with a noticeable performance impact. /RESET
Initializes the trace buffer to eliminate all events that have already been traced.
Traceable events within the XFC facility are organized by level of importance, from level 1 for rare, unusual events only, through level 4, which is a very detailed trace of events within the I/O flow through XFC. The trace buffer can be reset to clear older trace points.
Displays the contents of an XFC context block (CTX).
XFC SHOW CONTEXT [address][/STALLING|/FULL|/BRIEF]
address
The address of the CTX. If no address is supplied, then all the context structures are displayed.
/BRIEF
Displays a brief summary for each context; for example, the I/O type, start virtual block number (VBN), and length of I/O./FULL
Displays the complete context structure. This is the default./STALLING
Displays only contexts that are stalling; for example, those that have a stall reason code other than estrNotStalling.
The SHOW CONTEXT command displays the contents of an active context block. The state of each active operation within XFC is maintained in a data structure called a context block.
This example shows the address of the context block, I/O type (the type of operation), I/O phase (what phase the operation is in), I/O stall (reason for its stalling), volume ID (address of the control volume block), start VBN (starting VBN of the I/O), length of the I/O, and I/O request packet (the address of the IRP).
2. SDA> XFC SHOW CONTEXT FFFFFFFF8190D690 List of All XFC Active Contexts (CTX) ------------------------------------- Context (CTX) Address: FFFFFFFF8190D690 I/O Phase: eiopFillContext I/O Type: eiotReadThrough Operation started: 17-APR-2002 11:23:29.00 Stall Reason: estrWindowTurn Stall Extent: 0000000000000000 Stall Op (IRP): FFFFFFFF81267A40 Saved AST Parameter: 0000000000000000 Restart Routine: 0000000000000000 Context state flags 00000000 Cache Hit: False HWM Checked: False Fork Restarted False AST Required (flush) False Buffer locked False Stalled converting False Fork Block in use False Override resource checks False Restart cluster trans False Restart cluster flush False MV volumes skipped False Depose pending False Ignore CFB Quiesce False Delete CFB False Read-ahead hit False ECB Count: 0 Index: 00000000 ( 0) Start VBN: 000107C1 ( 67521) Length in Blocks: 00000020 ( 32) Next VBN: 000107C1 ( 67521) I/O Extent Count: 0 Disk I/O Length: 00000020 ( 32) Bytes Copied: 0 Bytes Zeroed: 0 Bytes Requested: 16384 Volume (CVB): 0000000000000000 Volume Id: FFFFFFFD8311BD00 File Id: 0000000000000C54 Cache File Block: FFFFFFFD82CEA2A0 Process (PCB): FFFFFFFF818FA500 |
This example shows output of a full display of a context block for a read I/O.
Displays the contents of an extent control block (ECB).
XFC SHOW EXTENT address
address
The address of the ECB.
None.
The SHOW EXTENT command diplays the contents of an extent control block (ECB). The data in the cache is divided into groups of VBNs called extents. Each extent is maintained in a data structure called an extent control block.
SDA> XFC SHOW EXTENT FFFFFFFD82A58A20
Cache Extent Address: FFFFFFFD82A58A20
Type: Primary
Flink: FFFFFFFF7F880350
Blink: FFFFFFFF7F880350
Start VBN: 00000001 ( 1)
Start LBN: 00BA711C ( 12218652)
Length in Blocks: 00000006 ( 6)
Data State: Clean
Pin: None
Buffer Address: FFFFFFFDB0996000
Secondary ECB Queue: FFFFFFFD82A58A60
Flink: FFFFFFFD83199A20
Blink: FFFFFFFD83199A20
Primary ECB: 0000000000000000
LRU Queue: FFFFFFFD82A58AAC
Flink: FFFFFFFD82A5A26C
Blink: FFFFFFFD82A5344C
Waiters Queue: FFFFFFFD82A58A50
Flink: FFFFFFFD82A58A50
Blink: FFFFFFFD82A58A50
Lock Id: 00000000
Parent CFB: FFFFFFFD82A61180
ECB delete pending False
ECB on LRU queue True
ECB depose pending False
ECB read ahead False
LRU priority: 1
|
This example shows the contents of an extent control block.
Displays the contents of the cache file block (CFB).
XFC SHOW FILE [address] [/EXTENTS|/ID=file-id
|/CVB=address |/OPEN|/CLOSED|/STATISTICS |/FULL
|/BRIEF]
address
The address of the CFB. The /OPEN and /CLOSED qualifiers, if present, are ignored. If no address is supplied, then all the CFBs are displayed.
/BRIEF
Displays the following summary information for each cache file block (CFB): CFB address, cache volume block (CVB) address, access count, active I/O count, and file ID./BRIEF is incompatible with /EXTENTS, /FULL, and /STATISTICS.
If the file specification is available in LIB$FID_TO_NAME(), it is displayed; otherwise, the file ID is displayed.
Note
Because the volume is accessed through its logical name, if two volumes are mounted that have the same logical name (for example, one mounted /SYSTEM and one mounted privately, which results in the same logical name in two different access-mode logical name tables), the incorrect file specification might be displayed./CLOSED
Displays only CFBs whose access count is zero./CVB=address
Displays information only for files matching the given cache volume block address./DISPLAY_NAME (default)
/NODISPLAY_NAME
Controls whether the file specification is displayed./EXTENTS
Displays the cache extents held in cache for any displayed files. This shows the primary and secondary cache extents along with their data state, virtual block numbers (VBNs), and logical block numbers (LBNs). It also shows a summary of memory usage (pagelets used and pagelets valid) for any displayed files. The /EXTENTS qualifier is incompatible with the /BRIEF qualifier./FULL
Displays all fields for each cache file block. This is the default.If the file specification is available in LIB$FID_TO_NAME(), it is displayed; otherwise, the file ID is displayed.
Note
Because the volume is accessed through its logical name, if two volumes are mounted that have the same logical name (for example, one mounted /SYSTEM and one mounted privately, which results in the same logical name in two different access-mode logical name tables), the incorrect file specification might be displayed./ID=file-id
Displays only information about any files matching the given file-identification (FID). The file identification (FID) is the hexadecimal file number component in a format file ID (file number, sequence number, relative volume number)./OPEN
Displays only CFBs whose access count is greater than zero./STATISTICS
Displays more statistics about the specified file. The /STATISTICS qualifier is incompatible with the /BRIEF qualifier.
The SHOW FILE command displays the contents of the XFC cache file block. The state of any file in the cache is maintained in a data structure called a cache file block (CFB). There is a CFB for every open file on a system and a CFB for each closed file that is still being cached.
This example shows the brief output from this command.
2. SDA> XFC SHOW FILE/STATISTICS FFFFFFFD831A24C0
Full Cache File Block (CFB) Details
-----------------------------------
CFB Address: FFFFFFFD831A24C0
CFB Address: FFFFFFFD831A24C0
Flink: FFFFFFFD831A22C0
Blink: FFFFFFFD831A2700
Access Count: 1
Write Access Count: 0
Volume (CVB): FFFFFFFD831FE080
Quiescing: False
File (FCB): FFFFFFFF81943D80
Volume Id: FFFFFFFD831FE080
File Id: 0000000000000383
External FID: (899,4,0)
Predicted Next VBN: 000000FB ( 251)
Active Caching Mode: Write Through
Active I/O count: 0
Flush Fail Status: 00000000 ( 0)
No Readahead Reasons: 0
Active Readaheads: 0
File Bad: False
Caching disabled: False
File deleted on close: False
File Quiescing: False
File Deposing: False
File Deleting: False
File BlkASTInProg: False
File IgnoreBlkAST False
File Readahead EOF False
PECBs Allocated: 13 ( 13 pages)
PECBs Deallocated: 0
PECBs Deallocated: 0
SECBs Allocated: 3
SECBs Deallocated: 19
Lock Id: 0C00037F
Granted Lock mode: PRMode
Conversion phase: Illegal
Conversion phase count: 1
Hash Bucket Queue: FFFFFFFD831A2520
Flink: FFFFFFFF7FF819B0
Blink: FFFFFFFF7FF819B0
PECB Queue: FFFFFFFD831A2530
Flink: FFFFFFFD8311888C
Blink: FFFFFFFD831A072C
Stalled IOs Queue: FFFFFFFD831A24F0
Flink: FFFFFFFD831A24F0
Blink: FFFFFFFD831A24F0
FAL transition Queue: FFFFFFFD831A2500
Flink: FFFFFFFD831A2500
Blink: FFFFFFFD831A2500
Contexts Waiting: FFFFFFFD831A2510
Flink: FFFFFFFD831A2510
Blink: FFFFFFFD831A2510
BlkASTs Waiting: FFFFFFFD831A2540
Flink: FFFFFFFD831A2540
Blink: FFFFFFFD831A2540
Deaccess Wait List: FFFFFFFD831A2600
Flink: 0000000000000000
Quiesce context: 0000000000000000
Up convert context: 0000000000000000
File IO Statistics - all in decimal
-----------------------------------
Statistics Valid From: 19-APR-2002 07:10:32.77
Total QIOs to this file: 14
Read IOs to this file: 14
Write IOs to this file: 0
Write IOs to this file: 0
Read Hits: 6
Hit Rate: 42.86 %
Average Overall I/O response time to this file
in milliseconds: 0.9525
Average Cache Hit I/O response time to this file
in milliseconds: 0.0702
Average Disk I/O response time to this file
in milliseconds: 1.6141
Accuracy of I/O resp time: 65 %
Read Ahead Count: 0
Read Through Count: 14
Write Through Count: 0
Read Around Count: 0
Write Around Count: 0
CFB FAL stalls: 1
CFB Operation stalls: 0
FAL Blocking ASTs: 0
Quiesce Depose: 0
Quiesce depose Stalls: 0
(I/O size statistics not collected for this file)
Files found: 1
|
This example shows a collection of performance statistics for a file.
Displays approximately three days of XFC activity in 10-minute intervals.
XFC SHOW HISTORY
None.
None.
Displays a subset of the fields of an I/O Request Packet that has relevance for XFC debugging.
XFC SHOW IRP address
address
The address of the IRP structure whose relevant fields are to be decoded and displayed.
None.
Displays information about memory used by the cache.
XFC SHOW MEMORY [/BRIEF|/FULL]
None.
/BRIEF
Displays summary statistics on XFC memory use./FULL
Displays full statistics on XFC memory use. This is the default.
| #1 |
|---|
SDA> XFC SHOW MEMORY
XFC Memory Statistics
---------------------
Pool allocation calls : 430
Pool allocation failures : 0
Pool deallocation calls : 0
Page allocation calls : 2745
Page deallocation calls : 6
Cache VA Regions and Limits
---------------------------
Cache VA region from FFFFFFFD80000000 to FFFFFFFF80000000 ( 1048576 pages)
permanent area : FFFFFFFD80000000 to FFFFFFFDBE800000 ( 128000 pages)
pool : FFFFFFFD80000000 to FFFFFFFD83200000 ( 6400 pages)
data : FFFFFFFD83200000 to FFFFFFFDBE800000 ( 121600 pages)
dynamic area : FFFFFFFDBE800000 to FFFFFFFF7F780000 ( 919488 pages)
pool : FFFFFFFDBE800000 to FFFFFFFDD4F2C000 ( 45974 pages)
data : FFFFFFFDD4F2C000 to FFFFFFFF7F780000 ( 873514 pages)
extent hash table: FFFFFFFF7F780000 to FFFFFFFF7FF80000 ( 1024 pages)
file hash table : FFFFFFFF7FF80000 to FFFFFFFF80000000 ( 64 pages)
file hash table : FFFFFFFF7FF80000 to FFFFFFFF80000000 ( 64 pages)
qhdPermanentPoolFreePages : FFFFFFFF80D305B8
qhdPermanentDataFreePages : FFFFFFFF80D305C8
Non-Paged Pool allocated : 45248 (44.1 KB)
Non-Paged Pool number of - FKBs : 403
Non-Paged Pool number of - DBMs : 3
Non-Paged Pool number of - CTXs : 10
Current Maximum Cache Size : 8589934592 (8.0 GB)
Boottime Maximum Cache Size : -1
Permanent Data Pages: Allocated : 121600
In use : 2739
Pool Pages: Allocated : 6400
In use : 128
Dynamic Pages: Max Allowed : 919488
Allocated : 0
In use : 0
Min Allowed : 20971
Data Pages: Allowed : 873514
In use : 0
Pool Pages: Allowed : 45974
In use : 0
PFN List : 0
Non PFN List : 0
Total Cache Memory (bytes) : 1048621248 (1000.0 MB)
Private PFN List Stats
----------------------
Dynamic Area PFN List : FFFFFFFF818EB340
Free physical pages on list : 0
Pages attributed to this list : 0
Pages being requested for return: 0
List priority : 0
Callback routine : 80DF8A40
Free PFN queue head : FFFFFFFF818EB350
First free page : 0000000000000000
Last free page : 0000000000000000
MMG Callback Counters
---------------------
MMG callback active : 0
MMG callback count : 0
MMG callback requeues : 0
MMG callback requeue again : 0
Expand attempts callback active : 0
Pages reclaimed : 0
Trim reclaim attempts : 0
LRU depose calls TrimWorkingSet : 0
Zone Purges: Permanent : 0
Dynamic PFNLST : 0
Dynamic No PFNLST : 0
Pool Zone Stats (S2 Space) Permanent Dynamic
SECB: Size 112, PerPage 71
Pages / MaxPages 12 / 6400 ||| 0 / 45974
FreePkts / TotalPkts 64 / 852 ||| 0 / 0
Hits 5499 ||| 0
Not first page 0 ||| 0
Misses (expns/fails) 12 ( 12 /0) ||| 0 ( 0 / 0)
PECB: Size 176, PerPage 45
Pages / MaxPages 85 / 6400 ||| 0 / 45974
FreePkts / TotalPkts 6 / 3825 ||| 0 / 0
Hits 3740 ||| 0
Not first page 0 ||| 0
Misses (expns/fails) 85 ( 85 /0) ||| 0 ( 0 / 0)
CFB: Size 544, PerPage 14
Pages / MaxPages 29 / 6400 ||| 0 / 45974
FreePkts / TotalPkts 3 / 406 ||| 0 / 0
Hits 488 ||| 0
Not first page 0 ||| 0
Misses (expns/fails) 29 ( 29 /0) ||| 0 ( 0 / 0)
CVB: Size 608, PerPage 13
Pages / MaxPages 2 / 6400 ||| 0 / 45974
FreePkts / TotalPkts 12 / 26 ||| 0 / 0
Hits 12 ||| 0
Not first page 0 ||| 0
Misses (expns/fails) 2 ( 2 /0) ||| 0 ( 0 / 0)
IOSIZE: Size 3120, PerPage 2
Pages / MaxPages 0 / 6400 ||| 0 / 45974
FreePkts / TotalPkts 0 / 0 ||| 0 / 0
Hits 0 ||| 0
Not first page 0 ||| 0
Misses (expns/fails) 0 ( 0 /0) ||| 0 ( 0 / 0)
|
This example shows the full output from this command.
| #2 |
|---|
SDA> XFC SHOW MEMORY/BRIEF
XFC Memory Summary
------------------
Current Maximum Cache Size : 8589934592 (8.0 GB)
Boottime Maximum Cache Size : -1
Permanent Data Pages: Allocated : 121600
In use : 2739
Pool Pages: Allocated : 6400
In use : 128
Dynamic Pages: Max Allowed : 919488
Allocated : 0
In use : 0
Min Allowed : 20971
Data Pages: Allowed : 873514
In use : 0
Pool Pages: Allowed : 45974
In use : 0
PFN List : 0
Non PFN List : 0
Total Cache Memory (bytes) : 1048621248 (1000.0 MB)
|
This example shows the brief output from this command.
Displays general information about the Extended File Cache.
XFC SHOW SUMMARY [/STATISTICS]
None.
/STATISTICS
Additionally, displays read and write activity arranged by I/O size.
SDA> XFC SHOW SUMMARY
XFC Summary
-----------
Extended File Cache V1.0 Let unk I/Os through (Apr 18 2002 15:01:16)
Anchor Block Address: FFFFFFFF80D30210
Build Id:
Cache State: 0000A010
Cache in no-cache state: False
MaxAllowedCacheMode: eNodeFullXFC
Minimum cache size in Pages: 0001F400 ( 128000)
General
-------
Extent Hash Table Address: FFFFFFFF7F780000
Extent Hash Table Buckets: 524287
File Hash Table Address: FFFFFFFF7FF80000
File Hash Table Buckets: 32767
Count of private CTXs: 10
Count of private FKBs: 403
Count of private DIOBMs: 3
LRU
---
LRU Priority 0 Queue Address: FFFFFFFF80D30288
Queue Length: 00000446 ( 1094)
LRU Priority 1 Queue Address: FFFFFFFF80D30298
Queue Length: 00000AA5 ( 2725)
qhdContexts Address FFFFFFFF80D302B0
qhdIRPs Address FFFFFFFF80D302C0
Spinlock
--------
Cache Spinlock: 8125E780
Last Acquiring Module: ROOT$:[XFC.TMPSRC]XFC_SYS.C;4
Acquiring Line: 2887
Acquiring IPL: 0
Cache Tracing
-------------
Number of trace entries: 10000
Size of trace buffer: 800000
Current trace level: 4
Lost trace entrys: 0
Current trace sequence number: 318768
System Wide I/O Statistics since last reset
-------------------------------------------
Time of Last System-Wide Reset: 19-APR-2002 07:10:23.43
Total cache calls: 4505
Total cache calls: 4505
- Sum of Paging I/Os: 2493
- and other QIOs: 2012
- and NoCVB or PermNoCache QIOs: 0
Total Virtual Reads: 4197
Total Virtual Writes: 112
Total PageIOs not cached: 196
Total Logical I/Os: 0
Total Physical I/Os: 0
Total bypass write I/Os: 0
Synchronous I/O completions: 598
Physical I/O completions: 0
Total PID completion I/Os: 0
Total num IOs on reserved files: 1606
Total num IOs on global sections: 247
Count of stalls performed: 13
System Wide Read Percentage: 97.40 %
System Wide Cache Hit ratio: 57.90 %
System-Wide Read Statistics since last reset
--------------------------------------------
Virtual Reads: 4197
Sum of Read Around Count: 179
and Read Through Count: 4018
Reads Completed: 4197
Read Hits: 2495
Read Cache Hit Percentage: 59.45 %
Total Synch Completion Count: 598
Read Around due to Het. Cluster: 0
Read Around due to Modifiers: 0
Read Around due to Size: 16
Total reads past EOF: 1
Total I/Os with read-ahead: 239
Read Hits due to read-ahead: 307
Paging I/Os: 2493
System-Wide Write Statistics since last reset
---------------------------------------------
Virtual Writes: 112
Sum of Write Around Count: 0
and Write Through Count: 112
Write Around due to Het. Cluster: 0
Writes Completed: 112
Write Around due to Modifiers: 0
Write Around due to Size: 0
Total writes past EOF: 0
File/Volume Statistics
----------------------
Open Files: 239
Closed Files in the Cache: 164
Number of files truncated: 3
Volumes in Full XFC Mode: 0
Volumes in VIOC Compatible Mode: 13
Volumes in No Caching Mode: 1
Volumes in Perm. No Caching Mode: 0
Volume Queue: FFFFFFFF80D30238
File/Volume Statistics
----------------------
FAL locks currently held: 370
FAL locks chosen to skip: 0
FAL locks acquired since boot: 374
FAL locks released since boot: 4
FAL locks converted: 55
I/Os that have stalled for FAL 0
CACHE$ACCESS stalls for CFB 0
ulStallOpQStalls 1
Read-thro->Read-around conv. 0
Writes converted to write-around 0
ulLockResourceExhaustionRetries: 0
ulFALLocksEverInContention: 3
ulFALUpConversionRequests: 3
ulFALLocksConvertedToPR: 0
ulFALLocksConvertedToNL: 0
FAL BlkASTs received: 1
FAL BlkASTs ignored: 0
ECBs Split Right: 2229
ECBs Split Left: 1710
ECBs Split Three Ways: 786
ECBs Requiring no splits: 5802
Volume Lock Statistics
----------------------
VIL Blocking ASTs received 0
VIL Blocking ASTs stalled 0
VIL Blocking ASTs started 0
VIL Blocking ASTs completed 0
VIL Up-conversion requests made 0
VIL Up-conversion grants 0
VCML Blocking ASTs received 0
VCML Blocking ASTs stalled 0
VCML Blocking ASTs started 0
VCML Blocking ASTs completed 0
VCML Up-conversion requests made 0
VCML Up-conversion grants 0
Stalls on VCML up-conversion 0
Restarts on VCML up-conversion 0
Quiesce and Depose Statistics
-----------------------------
Quiesce and Depose files Stalled: 0
File Quiesce and Deposes Started: 114
File Quiesce and Deposes Cmpltd: 114
File Quiesce and Deposes Cmpltd: 114
Q&D CTX used count: 0
Q&D CTX in use: False
Most recent Depose time 0.0005 msec.
Most recent Depose ECB count 0
Maximum Depose time 0.1125 msec.
Maximum ECBs deposed 3
Total Depose time 0.0002 seconds
Total ECBs deposed 6
Pending Lock Up-conversion Statistics
-------------------------------------
Up-conversions stalled: 0
Up-conversions started: 0
|
This example shows the output of detailed statistics and status for the cache.
Displays both the extent hash table (EHT) and the file hash table (FHT).
XFC SHOW TABLES [/ALL][/EXTENT][/FILE][/SUMMARY]
None.
/ALL
Displays the contents of the extent hash table (EHT) and file hash table (FHT). This is the default./EXTENT
Displays only the contents of the EHT./FILE
Displays only the contents of the FHT./SUMMARY
Displays summary information about EHT and FHT.
The SHOW TABLES command outputs information about the two hash tables used by XFC to locate key data structures.
SDA> XFC SHOW TABLES/SUMMARY
Full Map of CFB HashTable
-------------------------
FHT: Contents of 32768 buckets
0(32366)
1(401)
2(1)
Total number of CFBs: 403
Longest chain length: 2
Shortest chain length: 0
Shortest chain length: 0
Average chain length: 0.01
Full Map of PECB HashTable
--------------------------
EHT: verifying 524288 buckets
0(520501)
1(3755)
2(32)
Total number of PECBs: 3819
Longest chain length: 2
Shortest chain length: 0
Average chain length: 0.01
|
This example shows summary output about each of the hash tables.
Displays all or selected portions of the XFC trace buffer, starting with the most recent entry and moving backward in time.
XFC SHOW TRACE [/ALL]/CONTAINING=value |/CPU=cpu-num
|/LINENUMBER=linenumber
|/MATCH [=[AND|OR]] |/Px=value |/RAW]
None.
/ALL
Displays the entire trace buffer. This is the default./CONTAINING=value
Displays only records where any of the traced parameters is equal to value./CPU=cpu-num
Displays only records from threads executing on CPU cpu-num./LINENUMBER=linenumber
Displays only records from tracepoints at line linenumber in the relevant source files./MATCH [= AND|OR]
Alters the sense of the match condition when more than one of the filter qualifiers /CPU, /LINENUMBER, /FILENAME, /Px, or /CONTAINING are specified./Px=value
Displays only records where one of the traced parameters P1, P2, P3, or P4 is equal to value./RAW
Displays contents of trace records in hexadecimal format without interpretation. By default, the values are displayed in human readable format with filenames.
The SHOW TRACE command outputs the contents of each entry in the XFC trace buffer. Currently, detailed XFC tracing is enabled only for debug versions of XFC.
This example shows the output of XFC trace information.
Displays the contents of a cache volume block (CVB).
XFC SHOW VOLUME [address]/BRIEF|/FULL| /NAME=DISK $volume_label| /STATISTICS
address
The address of a CVB. If no address is supplied, then all volumes are displayed.
/BRIEF
Displays summary information for each volume./FULL
Displays a complete list of information about each volume. This is the default./NAME=DISK$volume_label
Displays information for the volume with the specified name./STATISTICS
Displays the read and write I/O activity for this volume. The /STATISTICS qualifier is incompatible with the /BRIEF qualifier.
The SHOW VOLUME command shows state information and statistics about all volumes mounted on the system.
The above example shows the output derived from invoking the /BRIEF qualifier.
2. SDA> XFC SHOW VOLUME FFFFFFFD831FE080
Cache Volume Block (CVB)
------------------------
Statistics Valid From: 19-APR-2002 07:10:23.54
Name: DISK$FRROOG_RUBY
CVB Address: FFFFFFFD831FE080
Flink: FFFFFFFF80D30238
Blink: FFFFFFFD831FE300
Volume (VCB): FFFFFFFF81905100
Unit (UCB): FFFFFFFF8150F200
Files Queue: FFFFFFFD831FE0C0
Flink: FFFFFFFD83111800
Blink: FFFFFFFD831FC0A0
Cached Open Files: 236
Cached Closed Files: 157
Files Ever Opened: 502
Files Ever Deposed: 109
Pages Allocated: 2726
Total QIOs: 4195
Read Hit Count: 2408
Virtual Read Count: 4085
Virtual Write Count: 110
Read Percentage: 97 %
Hit Rate: 57 %
Average Overall I/O response time to this Volume
in milliseconds: 2.1186
Average Cache Hit I/O response time to this Volume
in milliseconds: 0.0789
Average Disk I/O response time to this Volume
in milliseconds: 4.8671
Accuracy of I/O resp time: 83 %
Readahead Count: 233
Volume Caching Mode: evcmVIOCCompatible
Mounted /NOCACHE: False VCML Allows Caching: True
Quiescing: False Quiesce in Progress: False
No Cache from Logio: False VIL Blk AST Stall: False
Flush Pending: False VCML Blk AST Stall: False
VCML Blk CTX Stall: False VIL Blk CTX Stall: False
Dismount Stall: False Logio Stall: False
Flush in Progress: False Cluster Trans Stall: False
Dismount Pending: False VIL Up Needed: False
Tqe In Use: False VCML Up Needed: False
VIL blocking AST CTX: 0000000000000000
VCML blocking AST CTX: 0000000000000000
Dismount Stall CTX: 0000000000000000
LogIO Stall CTX: 0000000000000000
Up conversion CTX: 0000000000000000
VIL lock id: 0100007A
VIL LogIO lock id: 00000000
VCML lock id: 010000FF
VCML LogIO lock id: 00000000
Logical IO safety: elogioNotSafe
LogIOMutex: 00000000818EB610
Last LogIO time: 00000000
Active I/O count: 0
Stalled Ops Queue: FFFFFFFD831FE0B0
Flink: FFFFFFFD831FE0B0
Blink: FFFFFFFD831FE0B0
Volumes found: 1
|
This example shows the output for a specific cache volume block (CVB).
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