DataKeeper™ Tips, Tuning and Troubleshooting

Transcription

Module 4: Tips, Tuning and
Troubleshooting
August 10
Learning Objectives
At the end of this module, you will understand:
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Minimizing initial synchronization time
DataKeeper™ registry settings
The DataKeeper™ command line interface
User-reported issues and resolutions
Known restrictions
Copyright © 2000-2008 by SteelEye Technology, Inc. All Rights Reserved.
2
August 10
DataKeeper™ Tips, Tuning and
Troubleshooting
Local Initial Synchronization
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August 10
Troubleshooting
 Addresses issue of limited bandwidth
 Much faster than WAN-based resynchronization
 Not a panacea
4
August 10
Troubleshooting:
Setup Final IP Configuration on Source and Target
5
August 10
Troubleshooting:
Create Static Routes and Test via Ping
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August 10
Troubleshooting:
Local synch, then relocate target
 Connect to all servers.
 Create job and mirror(s) with
appropriate compression
setting(s).
 Complete initial
synchronization.
 Shutdown target.
 Delete route to target from
source.
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August 10
Troubleshooting:
Local synch, then relocate target
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August 10
Troubleshooting
Performance Optimization
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August 10
Troubleshooting:
Compression
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August 10
Troubleshooting:
Replication Bandwidth Throttle
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August 10
Troubleshooting:
Registry Settings
12
Troubleshooting:
Registry Settings
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ExtMirr\Parameters
August 10
Parameter
Default
Value(s)
DontFlushAsynchQueue
none
drive letter(s) of replicated volume(s)
WriteQueueHighWater
9600
decimal
WriteQueueLowWater
50
decimal
MaxResyncPasses
200
decimal
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Troubleshooting:
WAN Performance Optimization
Registry Settings
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ExtMirr\Parameters
August 10
Parameter
Default (decimal)
Recommended (Decimal)
3000
10000 (max = 40000)
MaxPingMisses
1
12
NetworkRetries
1
10
NetworkRetryDelay
5000
10000
NetWriteTimeout
10000
30000
9
9
PingInterval
ValidateTargetRetries
14
Troubleshooting:
WAN Performance Optimization
Registry Settings
Global Setting:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters
GlobalMaxTcpWindowSize (REG_DWORD) = Window Size
Tcp1323Opts (REG_DWORD) = 1
For NIC being used for replication:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters
\Interfaces\{GUID}
TcpWindowSize (REG_DWORD) = Window Size
Where: Window Size = Bandwidth * Latency
August 10
15
August 10
Troubleshooting
Command Line Interface (EMCMD)
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August 10
Troubleshooting
Volume Related
Service Related
 STOPSERVICE
 GETSERVICEINFO
Job Related
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CREATEJOB
DELETEJOB
UPDATEJOB
GETJOBINFO
GETJOBINFOFORVOL
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LOCKVOLUME
UNLOCKVOLUME
GETVOLUMEINFO
GETMIRRORVOLINFO
GETEXTENDEDVOLUMEINFO
GETCOMPLETEVOLUMELIST
UPDATEVOLUMEINFO
ISPOTENTIALMIRRORVOL
RESTARTVOLUMEPIPE
GETVOLUMEDRVSTATE
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Troubleshooting
Volume Related
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GETCONFIGURATION
SETCONFIGURATION
GETSOURCEMIRROREDVOLUMES
GETTARGETMIRROREDVOLUMES
ISBREAKUSERREQUESTED
Mirror Related
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August 10
CREATEMIRROR
RESYNCMIRROR
BREAKMIRROR
PAUSEMIRROR
CONTINUEMIRROR
Mirror Related
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DELETEMIRROR
DELETELOCALMIRRORONLY
GETMIRRORTYPE
GETRESYNCSTATUS
READREGISTRY
CLEARSWITCHOVER
SWITCHOVERVOLUME
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August 10
Troubleshooting:
Command Line Interface
EMCMD (used by LifeKeeper)
Rewind Related
Bitmap Related
 GETREMOTEBITMAP
 MERGETARGETBITMAP
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ENABLEREWIND
DISABLEREWIND
SUSPENDREWIND
GETREWINDENABLED
GETREWINDSUSPENDED
GETREWINDLOGFILE
REWINDTAG
FLUSHREWINDLOGFILE
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August 10
Troubleshooting:
Usage:
EMCMD <ip address> GETMIRRORVOLINFO <letter>
Command:
Output:
emcmd 192.168.251.98 getmirrorvolinfo e
E: 1 192.168.251.98 192.168.252.98 1
Parameter
Description
E
Mirrored volume
1
Current ROLE of the system specified
0 = None
1 = Source
2 = Target
192.168.251.98
SOURCE system
192.168.252.98
TARGET system
1
Current STATE of the mirror
0 – None
1 – Mirroring
2 – Resyncing
3 – Broken
4 – Paused
5 – Resync Pending
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August 10
Troubleshooting:
Use Case: Manual Switchover, Source Out of Service
EMCMD <target ip> SWITCHOVERVOLUME <letter>
Use Case: Manual Switchover, Source Destroyed
EMCMD <target ip> DELETELOCALMIRRORONLY <letter>
EMCMD <target ip> CLEARSWITCHOVER <letter>
Source must be off-line, otherwise a mirror split-brain
condition may be created.
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August 10
Troubleshooting:
Use Case: Target as Tape Backup Source
 Tape backup tools may be used without application-aware agents
 Scripted/automated
Description
Command
Pause the mirror on
the source system
specifying IP
address of target
EMCMD <source ip> PAUSEMIRROR <letter> <target ip>
Unlock volume on
target system.
EMCMD <target ip> UNLOCKVOLUME <letter>
Backup or copy
data from target
system.
copy; xcopy; ntbackup; backup; …
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August 10
Troubleshooting:
Use Case: Target as Tape Backup Source
Description
Command
Lock volume on
target system.
EMCMD <target ip> LOCKVOLUME <letter>
Continue mirror on
source system
EMCMD <source ip> CONTINUEMIRROR <letter> <target ip>
 When mirror paused and unlocked, writes to source are flagged in
bitmap. Sent to target when mirror continued (partial
resynchronization).
 When target unlocked, it is writable. Any blocks written on target
overwritten by source blocks when mirror continued (partial
resynchronization).
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August 10
Troubleshooting:
Use Case: Disk-to-Disk Copy
Mirror Source
Replication
Mirror Target
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August 10
Troubleshooting
Troubleshooting, Known Issues and
Restrictions
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August 10
Troubleshooting
“Split Brain” Scenario
 Communications between
systems lost
 Target volume brought on-line
 Communications between
systems re-established
 Event logs indicate there are
two sources
 Mirror paused on both servers
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August 10
Troubleshooting
Split Brain
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August 10
Troubleshooting
Split Brain Recovery
 Determine which server should
be source
 Choose mirror source
 Click “OK”
Source
Server
 Mirror partially resynchronized
 Disconnect/Reconnect GUI
from/to servers if status
incorrect
Target
Server
Resynch
Volume X:
Volume X:
Mirror Source
Mirror Target
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August 10
Troubleshooting
Issues and Resolutions
Component
Message/Issue
Cause
Suggested
Action
User Interface
Cannot connect to
servers
NetBIOS (137-139)
and/or SMB (445) ports
blocked by firewall
Open ports
User Interface
Can connect to servers,
create job and select
volumes for source and
target, but mirror
creation fails
DataKeeper dispatch
port (9999) or mirror
ports (10000-10025)
blocked by firewall
Open ports
User Interface
No volumes available
for mirroring
Only C: available or
volume contains page
file
Create new volume or
remove page file from
volume
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August 10
Troubleshooting
Message/Issue
Cause
Suggested
Action
User Interface
Failed to create mirror.
Target System event
log entry contains error
code: 0xC0000055
Distributed Link
Tracking Client service
enabled and active
Stop and disable
service on both source
and target
User Interface
Mirror created, but not
stored in job. Event log
entry contains “File:
.\GuiThread.cpp Line
3099 …”
Local security policy for
“Network Access: Let
Everyone permissions
apply to anonymous
users” is disabled.
Enable policy on all
servers.
Create mirror failed.
vmms.exe program has
volume open
preventing DataKeeper
from obtaining volume
lock
Stop vmms.exe
program
Component
System Event Log
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August 10
Troubleshooting
Component
Message/Issue
Cause
Suggested
Action
Windows Clustering
Newly created resource
appears off-line but is
unlocked
Expected behavior
Bring resource on-line
Windows Clustering
DataKeeper Volume
resource not available for
use
DataKeeper installed
before cluster name
resource created
Perform repair install of
DataKeeper
Windows Clustering
DataKeeper Volume
resource not available for
use. Event log contains
“DataKeeperVolume.dll,
Error: 70”
All cluster nodes were
not on-line
Bring all cluster nodes
on-line
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August 10
Troubleshooting
Known Issues and Workarounds
Component
Message/Issue
Cause
Suggested Action
Performance Monitor
on Windows Server
2008 64-bit
No DataKeeper counter
logs available in
Performance Monitor
DataKeeper counters
not compatible with
64-bit Performance
Monitor
Use 32-bit Performance
Monitor (under
%WINDIR%\SysWow64\)
Performance Monitor
on Windows Server
2003
Counter logs do not
work on Windows
Server 2003
Known issue to be
resolved in future
release
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August 10
Troubleshooting
Known Restrictions and Recommendations
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DataKeeper home directory path name must be 32 characters or less
Pause mirror before running CHKDSK on source volume
Pause mirror before running defragmentation on source volume
Heavy write activity when using synchronous mirror negatively effects
application performance
 Resizing mirrored Dynamic Disks not supported
 Create bitmap directory before relocating bitmap files
 Bitmaps on Dynamic Disks that are not “System” are not supported
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August 10
Troubleshooting
Summary
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August 10
Troubleshooting
Summary





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Minimizing initial synchronization time for WAN deployments
DataKeeper™ registry keys and settings
The DataKeeper™ command line interface and several use cases
How to recover from a “split-brain” situation
User configuration oversights and errors
Known restrictions and explanations
35
End Module 4
Lab:
Tips, Tuning and
Troubleshooting
36

DataKeeper™ Tips, Tuning and Troubleshooting

Transcription

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