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Verifying the system 6–17
6.1.5.2 Verifying the performance of LUNs on a single server
CAUTION: Do not use the procedure described here to test the performance of a LUN that is a mirrored
LUN or a component of a mirrored LUN (MDS LUNs are usually mirrored). If the output of the show lun
command shows the LUN role as mirror, do not run the raw_lun_check.bash command on the LUN.
If you do so, the contents of the LUN may be destroyed.
The /usr/opt/hpls/diags/bin/raw_lun_check.bash command tests the performance of LUNs on
a single server. You must only run this command against one server at a time. Do not use the /usr/opt/
hpls/diags/bin/raw_lun_check.bash command to test the performance of a mirrored LUN or a
LUN that is a component of a mirrored LUN.
Although you can use the /usr/opt/hpls/diags/bin/raw_lun_check.bash command on a LUN
that has never been used in a file system, the test must format the LUN before the test can start. You can
format the LUN by using the -f and -r arguments with the raw_lun_check.bash command. However,
formatting a LUN can take a long time; for this reason, it is best to postpone testing the LUNs until they have
been used in a file system.
When you run the /usr/opt/hpls/diags/bin/raw_lun_check.bash command, the command first
checks if the LUN is a mirrored LUN component, and an error message may be displayed, as follows:
• If the LUN is a component of a mirrored LUN and the database is available, the following error
message is displayed:
# /usr/opt/hpls/diags/bin/raw_lun_check.bash -l "/dev/hpls/dev3a"
Checking for mirror components in database
Usage: raw_lun_check.bash [-h] | [-v] [-r -f] [-i <binary>] -l <lun_device>
<-s | -p>
Where:
-s, --serial Run a serial lun test
-p, --parallel Run a parallel lun test
-l, --lun <lun_device> Set the lun to test
-i, --iozone <binary> Use <binary> iozone instead of default
-r, --reformat Reformat the lun before running the test
-f, --force Force the reformat
-h, --help Print this help
-v, --verbose Give verbose output
You must NOT test a component of a mirror (/dev/hpls/dev3a)
#
• If the database is unavailable, the following message will be displayed. If the database is
unavailable, do not continue until you are certain that all LUNs to be tested are not components of a
mirrored LUN:
# /usr/opt/hpls/diags/bin/raw_lun_check.bash -l "/dev/hpls/dev3a"
Checking for mirror components in database
Database not ready - could not determine if luns to test are mirror components
Continue? [y/n]: n
Exiting by user request
#
In serial mode, the /usr/opt/hpls/diags/bin/raw_lun_check.bash command tests each
specified device (on the same server) in turn. In parallel mode, the command tests all specified devices (on
the same server) at the same time. The output from the command displays the speed at which the command
was able to read from and write to the specified device.
- System User Guide 1
- Version 2.2 1
- Contents 3
- 4 Viewing system information 4
- A CLI commands 9
- About this guide 11
- HP SFS documentation 12
- Documentation conventions 12
- Naming conventions 13
- For more information 13
- Providing feedback 13
- Safety considerations 15
- 1Overview 17
- 1.1 Product overview 18
- 1.1.2 Overview of HP SFS 19
- 1.1.3 HP SFS configurations 20
- 1.1.3.2 Storage 21
- 1.1.3.3 Network connections 23
- 1.1.3.3.2 Management network 24
- 1.3 Supported hardware 25
- Overview1–10 26
- 2 The sfsmgr utility 27
- 2.1 Overview 28
- 2.2 Starting the SFS CLI 28
- 2.3 Running sfsmgr commands 29
- The sfsmgr utility2–6 32
- 3 Operating the system 33
- 3.1 Booting the system 34
- 3.2 Shutting down the system 36
- 3.3 Booting a server 36
- 3.4 Booting multiple servers 37
- 3.7 Stopping a file system 39
- 3.8 Starting a file system 40
- 3.11 Managing licenses 47
- 3.12 Managing remote access 53
- 3.12.3 Viewing authorizations 55
- 4Viewing system information 57
- 4.4 Viewing LUN information 67
- 4.5 Viewing array information 69
- 4.6 Viewing event logs 72
- 4.6.1.1 Event filters 73
- 4.6.1.2 Event severity 73
- 4.6.1.3 Event facility 73
- LUNs — EVA4000 storage 88
- File system name 100
- Mount point 100
- Stripe size 100
- MDS LUNs 100
- Number of OST services 101
- Interconnects 102
- Quota options 102
- Mount options 102
- Stripe count 102
- 5.4 Operating a file system 111
- 5.7 Managing quotas 121
- command on 123
- # lfs quotacheck -ug /data 124
- 5.7.3 Checking quota limits 125
- 5.10 Deleting file systems 127
- 6.1 Verifying the system 132
- Verifying the system 6–5 135
- # ssh south3-adm hostname 150
- Sequential test 151
- Parallel test 152
- Incremental test 152
- Latency test 157
- Unidirectional bandwidth test 158
- Verifying the system 6–33 163
- 6.2 Managing email alerts 169
- 6.2.4 Default email alerts 171
- Managing email alerts 6–43 173
- 6.2.5 Modifying email alerts 174
- 6.2.6 Creating email alerts 174
- 6.2.7 Viewing email alerts 175
- 6.2.9 Deleting email alerts 176
- 6.5 Removing log files 180
- 6.6.1 Overview 181
- 6.6.2 Viewing the IML 181
- 6.6.3 Clearing the IML 181
- Configuration impact 201
- Object Storage Server 202
- Number FCA2214 DC) 204
- [root@south4 var]# raw -qa 206
- 8.2 Upgrading firmware 214
- # service cluster stop 216
- 8.3.3 Adding SFS20 arrays 222
- 8.3.4 Removing SFS20 arrays 222
- 9Troubleshooting 225
- 9.2 Server fails to boot 227
- 9.3 Server stops responding 227
- /proc/fs/lustre/mds/mds2 247
- # repair-lfsck -f scratch 250
- Troubleshooting9–34 258
- Remedial action 261
- 9.27.2.1 Recreating files 262
- 9.30 Accessing consoles 275
- 9.31.1.2 Using a Web browser 276
- 9.32 Troubleshooting licenses 277
- 9.36 System log files 288
- ACLI commands 295
- A.1 General information 296
- A.2 accept license command 297
- A.3 activate ost command 297
- A.4 boot server command 297
- A.5 configure commands 298
- A.5.2 configure server 300
- A.6 create commands 301
- A.6.3 create authorization 302
- A.6.4 create database_backup 302
- A.6.5 create filesystem 303
- A.7 deactivate ost command 304
- A.8 delete commands 304
- A.8.2 delete array 305
- A.8.3 delete attribute 305
- A.8.4 delete authorization 305
- A.9 disable commands 306
- A.9.2 disable server 307
- A.10 enable commands 308
- A.11 help command 309
- A.12 kill command command 309
- A.13 modify commands 310
- Interactive mode 311
- Scripted mode 311
- A.14 monitor command command 312
- A.15 pause filesystem command 312
- A.16 quit command 313
- A.18 scan mac command 313
- A.19 set commands 314
- A.19.2 set attribute 315
- A.19.3 set lun 316
- A.19.4 set nics 317
- A.19.5 set password 318
- A.19.6 set server 318
- A.20 show commands 319
- A.20.4 show authorization 320
- A.20.5 show commands 320
- A.20.6 show database_backups 321
- A.20.7 show filesystem 321
- A.20.8 show license 321
- A.20.9 show log 321
- Examples 322
- A.20.10 show lun 323
- A.20.11 show network 323
- A.20.12 show ost 323
- A.20.13 show server 324
- A.20.14 show support 324
- A.20.15 show system 324
- A.20.16 show version 324
- A.21 shutdown server command 325
- A.22 start filesystem command 325
- A.23 stop filesystem command 326
- A.24 syscheck command 326
- A.26 ! command 328
- B Performance figures 329
- B.1 I/O performance 330
- SFS20 storage — 250GB disks 331
- SFS20 storage — 5000GB disks 331
- B.2 Network performance 332
- B.3 SFS20 array configuration 333
- RAID5 and ADG Read Bandwidth 334
- 64 clients 336
- 128 Clients 336
- 192 clients 336
- Bandwidth vs Clients 337
- Single Client Varying OSTs 338
- 1500 MTU Average Write MB/sec 339
- 9000 MTU Average Read MB/sec 340
- C.1 EVA4000 storage examples 344
- EVA4000 storage examples C–3 345
- C.2 SFS20 storage examples 346
- SFS20 storage examples C–5 347
- D.1 RAID rebuild information 350
- E HP SFS specifications 351
- HP SFS specificationsE–4 354
- Glossary 355
- Glossary–2 356
- Glossary–3 357
- Glossary–4 358
- 9-24, 9-25 361
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