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Performance Tuning, Monitoring Performance

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Performance Tuning Over time, as a storage array exchanges data between the hosts and physical disks, its performance can degrade. Monitor the performance of a storage array and make adjustments to the storage array operational settings to improve performance. Monitoring Performance Monitor the performance of a storage array by using the save storageArray performanceStats command. This command saves performance information to a file that you can review to determine how well the storage array is running. The following table lists the performance information saved to the file. Table 13. Storage Array Performance Information Type of Information Devices Description Devices are: • RAID Controller Modules- The RAID controller module in slot 0 or 1 and a list of the virtual disks owned by the RAID controller module • Virtual Disk- A list of the virtual disk names • Storage Array Totals- A list of the totals for both RAID controller modules in an active-active RAID controller module pair, regardless if one, both, or neither are selected for monitoring Total I/Os Read Percentage Cache Hit Percentage Current KB/second Maximum KB/second Current IO/second Maximum IO/second Number of total I/Os performed since the storage array was started Percentage of total I/Os that are read operations (calculate the write percentage by subtracting the read percentage from 100 percent) Percentage of reads that are fulfilled by data from the cache rather than requiring an actual read from a physical disk Current transfer rate in kilobytes per second (current means the number of kilobytes per second since the last time the polling interval elapsed, causing an update to occur) Highest data transfer value achieved in the current kilobyte-per-second statistic block Current number of I/Os per second (current means the number of I/Os per second since the last time the polling interval elapsed, causing an update to occur) Highest number of I/Os achieved in the current I/O-per-second statistic block The general form of the command is: save storageArray performanceStats file="filename" where, file is the name of the file in which you want to save the performance statistics. You can use any file name your operating system can support. The default file type is .csv. The performance information is saved as a comma-delimited file. Before using the save storageArray performanceStats command, run the set session performanceMonitorInterval and set session performanceMonitorIterations commands to specify how often statistics are collected. 82

Section	Page
Dell PowerVault Modular Disk Storage Arrays CLI Guide	3
About The Command Line Interface	11
How To Use The Command Line Interface	11
Usage Notes	12
CLI Commands	12
Command Line Parameters	14
Formatting Considerations	18
Detailed Error Reporting	18
Exit Status	19
Usage Examples	20
About The Script Commands	23
Script Command Structure	23
Script Command Synopsis	25
Recurring Syntax Elements	26
Usage Guidelines	30
Adding Comments To A Script File	30
Configuring A Storage Array	33
Configuring A Storage Array	33
Determining What Is On Your Storage Array	34
Saving A Configuration To A File	35
Using The Create Virtual Disk Command	36
Using The Auto Configure Command	38
Modifying Your Configuration	40
Setting The Storage Array Password	40
Setting Up SMTP And SNMP Alerts	40
Setting The RAID Controller Module Clocks	41
Setting The Storage Array Host Type	41
Setting Modification Priority	42
Assigning Global Hot Spares	42
Selecting The Event Levels For Alert Notifications	43
Configuring Alert Notifications	43
Using The Snapshot Feature	45
Using Host Servers To Create An Initial Snapshot Virtual Disk	46
Creating A Snapshot Virtual Disk	46
Enabling The Snapshot Virtual Disk Feature	47
Creating A Snapshot Virtual Disk With User-Assigned Physical Disks	47
Preparing Host Servers To Create An Initial Snapshot Virtual Disk	47
Creating The Initial Snapshot Virtual Disk	48
Creating A Snapshot Virtual Disk With Software-Assigned Physical Disks	49
Creating A Snapshot Virtual Disk By Specifying A Number Of Physical Disks	49
User-Defined Parameters	50
Names Of Snapshot Virtual Disks And Repository Virtual Disks	52
Changing Snapshot Virtual Disk Settings	53
Stopping And Deleting A Snapshot Virtual Disk	53
Re-creating The Snapshot Virtual Disk	54
Preparing Host Servers To Re-create A Snapshot Virtual Disk	54
Re-creating A Snapshot Virtual Disk	54
Using The Virtual Disk Copy Feature	57
Creating A Virtual Disk Copy	58
Enabling The Virtual Disk Copy Feature	58
Determining Virtual Disk Copy Candidates	58
Creating A Virtual Disk Copy	58
Preparing Host Servers To Create A Virtual Disk Copy	59
Copying The Virtual Disk	59
Viewing Virtual Disk Copy Properties	60
Changing Virtual Disk Copy Settings	61
Recopying A Virtual Disk	62
Preparing Host Servers To Recopy A Virtual Disk	62
Recopying The Virtual Disk	62
Stopping A Virtual Disk Copy	63
Removing Copy Pairs	63
Interaction With Other Features	64
Storage Partitioning	64
Snapshot Virtual Disks	64
Using The Remote Replication Premium Feature	67
How Remote Replication Works	67
Replication Repository Virtual Disks	68
Replication Relationships	68
Data Replication	68
Link Interruptions Or Secondary Virtual Disk Errors	69
Resynchronization	69
Creating A Remote Replicated Pair	70
Performance Considerations	70
Enabling The Remote Replication Premium Feature	71
Activating The Remote Replication Premium Feature	71
Determining Candidates For A Remote Replicated Pair	73
Creating A Remote Replicated Pair	73
Changing Remote Replication Settings	74
Suspending And Resuming A Replication Relationship	75
Removing A Replication Relationship	75
Deleting A Primary Virtual Disk Or A Secondary Virtual Disk	76
Disabling The Remote Replication Premium Feature	76
Deactivating The Remote Replication Premium Feature	76
Interaction With Other Premium Features	76
Snapshot Virtual Disks	77
Virtual Disk Copy	77
Storage Partitioning	77
Virtual Disk Expansion	78
Maintaining A Storage Array	79
Routine Maintenance	79
Running A Media Scan	79
Running A Consistency Check	80
Resetting A RAID Controller Module	80
Enabling RAID Controller Module Data Transfer	81
Resetting Battery Age	81
Removing Persistent Reservations	81
Synchronizing RAID Controller Module Clocks	81
Locating Physical Disks	81
Performance Tuning	82
Monitoring Performance	82
Changing RAID Levels	83
Changing Segment Size	83
Defragmenting A Disk Group	83
Troubleshooting and Diagnostics	83
Collecting Physical Disk Data	84
Diagnosing A RAID Controller Module	84
Recovery Operations	84
Setting RAID Controller Module Operational Mode	85
Changing RAID Controller Module Ownership	85
Initializing A Physical Disk	85
Reconstructing A Physical Disk	86
Initializing A Virtual Disk	86
Redistributing Virtual Disks	86
Script Commands	89
Command Formatting Rules	89
Firmware Compatibility Levels	91
Commands Listed By Function	91
Disk Group Commands	91
Enclosure Commands	91
Host Topology Commands	91
iSCSI Commands	92
Physical Disk Commands	92
RAID Controller Module Commands	93
Remote Replication Commands	93
Session Command	94
Show String Command	94
Snapshot Commands	94
Storage Array Commands	94
Virtual Disk Commands	95
Virtual Disk Copy Commands	96
Commands Listed Alphabetically	96
Activate Remote Replication Feature	96
Activate Storage Array Firmware	99
Autoconfigure Storage Array	99
Autoconfigure Storage Array Hot Spares	100
Check Remote Replication Status	100
Check Virtual Disk Consistency	101
Clear Physical Disk Port Statistics	102
Clear Storage Array Configuration	102
Clear Storage Array Core Dump	103
Clear Storage Array Event Log	103
Clear Storage Array Firmware Pending Area	103
Clear Storage Array Recovery Mode	104
Clear Virtual Disk Reservations	104
Clear Virtual Disk Unreadable Sectors	104
Configure Automatic Support Bundle Collection	105
Create Disk Group	105
Create Disk Pool	109
Create Host	111
Create Host Group	111
Create Host Port	111
Create iSCSI Initiator	112
Create RAID Virtual Disk (Automatic Physical Disk Select)	113
Create RAID Virtual Disk (Free Capacity Base Select)	114
Create RAID Virtual Disk (Manual Physical Disk Select)	116
Create RAID Virtual Disk On A Disk Pool	119
Create Remote Replication	120
Create Snapshot Virtual Disk	122
Scheduling Snapshots	126
Create Storage Array Security Key	127
Create Virtual Disk Copy	129
Deactivate Remote Replication	130
Delete Disk Group	130
Delete Disk Pool	131
Delete Host	131
Delete Host Group	131
Delete Host Port	132
Delete iSCSI Initiator	132
Delete Snapshot Virtual Disk or Delete Snapshot Virtual Disk Schedule	133
Delete Virtual Disk	133
Delete Virtual Disk On A Disk Pool	134
Diagnose RAID Controller Module	135
Diagnose RAID Controller Module iSCSI Host Cable	136
Diagnose Remote Replication	137
Disable Storage Array Feature	138
Display Automatic Support Bundle Collection Configuration	138
Display Support Bundle Collection Schedule	138
Download Enclosure Management Module Firmware	139
Download Physical Disk Firmware	139
Download Storage Array Firmware/NVSRAM	140
Download Storage Array Physical Disk Firmware	141
Download Storage Array NVSRAM	142
Enable Disk Group Security	142
Enable Disk Pool Security	142
Enable RAID Controller Module Data Transfer	143
Enable Storage Array Feature	143
Increase Virtual Disk Capacity On A Disk Pool	144
Load Storage Array DBM Database	144
Recopy Virtual Disk Copy	145
Re-Create Remote Replication Repository Virtual Disk	146
Re-Create Snapshot	148
Reduce Disk Pool Capacity	150
Remove Remote Replication	150
Remove Virtual Disk Copy	151
Remove Virtual Disk LUN Mapping	151
Repair Virtual Disk Consistency	152
Replace Physical Disk	152
Reset RAID Controller Module	153
Reset Storage Array Battery Install Date	154
Reset Storage Array iSCSI Baseline	154
Reset Storage Array SAS PHY Baseline	155
Reset Storage Array Virtual Disk Distribution	155
Resume Remote Replication	155
Resume Snapshot Rollback	156
Revive Disk Group	156
Revive Disk Pool	157
Revive Physical Disk	157
Save Enclosure Log Data	157
Save Physical Disk Channel Fault Isolation Diagnostic Status	158
Save Physical Disk Log	158
Save RAID Controller Module NVSRAM	158
Save Storage Array Configuration	159
Save Storage Array Events	160
Save Storage Array iSCSI Statistics	161
Save Storage Array Performance Statistics	161
Save Storage Array SAS PHY Counts	162
Save Storage Array State Capture	162
Save Storage Array Support Data	162
Schedule Support Bundle Collection Configuration	163
Scheduling Snapshots	164
Set Disk Group	165
Set Disk Group Forced State	167
Set Disk Pool	167
Set Enclosure Attribute	168
Set Enclosure Identification	168
Set Foreign Physical Disk to Native	169
Set Host	169
Set Host Channel	170
Set Host Group	171
Set Host Port	171
Set iSCSI Initiator	172
Set iSCSI Target Properties	172
Set Physical Disk Channel Status	173
Set Physical Disk Hot Spare	174
Set Physical Disk State	174
Set RAID Controller Module	175
Set Remote Replication	177
Set Session	179
Set Snapshot Virtual Disk	180
Set Storage Array	181
Set Storage Array Enclosure Positions	183
Set Storage Array ICMP Response	184
Set Storage Array iSNS Server IPv4 Address	184
Set Storage Array iSNS Server IPv6 Address	185
Set Storage Array iSNS Server Listening Port	185
Set Storage Array Learn Cycle	185
Set Storage Array Redundancy Mode	186
Set Storage Array Security Key	186
Set Storage Array Time	187
Set Storage Array Unnamed Discovery Session	187
Set Virtual Disk	187
Set Virtual Disk Copy	190
Show Current iSCSI Sessions	191
Show Disk Group	192
Show Disk Group Export Dependencies	192
Show Disk Group Import Dependencies	193
Show Disk Pool	193
Show Host Ports	193
Show Physical Disk	194
Show Physical Disk Channel Statistics	195
Show Physical Disk Download Progress	196
Show RAID Controller Module	196
Show RAID Controller Module NVSRAM	197
Show Remote Replication Virtual Disk Candidates	198
Show Remote Replication Virtual Disk Synchronization Progress	198
Show Storage Array	199
Show Storage Array Auto Configure	200
Show Storage Array Host Topology	201
Show Storage Array LUN Mappings	202
Show Storage Array Negotiation Defaults	202
Show Storage Array Unconfigured iSCSI Initiators	202
Show Storage Array Unreadable Sectors	203
Show String	203
Show Virtual Disk	203
Show Virtual Disk Action Progress	205
Show Virtual Disk Copy	205
Show Virtual Disk Copy Source Candidates	206
Show Virtual Disk Copy Target Candidates	206
Show Virtual Disk Performance Statistics	206
Show Virtual Disk Reservations	207
Start Configuration Database Diagnostic	207
Start Disk Group Blink	208
Start Disk Group Defragment	208
Start Disk Group Export	208
Start Disk Group Import	209
Start Disk Pool Locate	209
Start Enclosure Blink	209
Start iSCSI DHCP Refresh	210
Start Physical Disk Blink	210
Start Physical Disk Channel Blink	211
Start Physical Disk Channel Fault Isolation Diagnostics	211
Start Physical Disk Initialize	212
Start Physical Disk Reconstruction	212
Start Remote Replication Synchronization	213
Start Secure Physical Disk Erase	213
Start Snapshot Rollback	213
Stop Snapshot Rollback	214
Start Storage Array Blink	214
Start Storage Array iSCSI Refresh	214
Start Virtual Disk Initialization	215
Stop Configuration Database Diagnostic	215
Stop Disk Group Blink	215
Stop Disk Pool Locate	216
Stop Enclosure Blink	216
Stop Physical Disk Blink	216
Stop Physical Disk Channel Blink	216
Stop Physical Disk Channel Fault Isolation Diagnostics	216
Stop Snapshot	217
Stop Storage Array Blink	217
Stop Storage Array iSCSI Session	217
Stop Storage Array Physical Disk Firmware Download	217
Stop Virtual Disk Copy	218
Suspend Remote Replication	218
Validate Storage Array Security Key	219
Sample Script Files	221
Configuration Script Example 1	221
Configuration Script Example 2	222
CLI Command Updates	225
New Commands	225

Match case Limit results 1 per page

Performance Tuning

Over time, as a storage array exchanges data between the hosts and physical disks, its performance can degrade.

Monitor the performance of a storage array and make adjustments to the storage array operational settings to improve

performance.

Monitoring Performance

Monitor the performance of a storage array by using the

save storageArray performanceStats

command.

This command saves performance information to a file that you can review to determine how well the storage array is

running. The following table lists the performance information saved to the file.

Table 13. Storage Array Performance Information

Type of Information

Description

Devices

Devices are:

•

RAID Controller Modules— The RAID controller module in slot 0 or 1 and

a list of the virtual disks owned by the RAID controller module

•

Virtual Disk— A list of the virtual disk names

•

Storage Array Totals— A list of the totals for both RAID controller

modules in an active-active RAID controller module pair, regardless if

one, both, or neither are selected for monitoring

Total I/Os

Number of total I/Os performed since the storage array was started

Read Percentage

Percentage of total I/Os that are read operations (calculate the write percentage

by subtracting the read percentage from 100 percent)

Cache Hit Percentage

Percentage of reads that are fulfilled by data from the cache rather than

requiring an actual read from a physical disk

Current KB/second

Current transfer rate in kilobytes per second (current means the number of

kilobytes per second since the last time the polling interval elapsed, causing an

update to occur)

Maximum KB/second

Highest data transfer value achieved in the current kilobyte-per-second statistic

block

Current IO/second

Current number of I/Os per second (current means the number of I/Os per

second since the last time the polling interval elapsed, causing an update to

occur)

Maximum IO/second

Highest number of I/Os achieved in the current I/O-per-second statistic block

The general form of the command is:

save storageArray performanceStats file="filename"

where,

file

is the name of the file in which you want to save the performance statistics. You can use any file name your

operating system can support. The default file type is

.csv

. The performance information is saved as a comma-delimited

file.

Before using the

save storageArray performanceStats

command, run the

set session

performanceMonitorInterval

and

set session performanceMonitorIterations

commands to

specify how often statistics are collected.