Lustre 1.6 Operations Manual

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20.2.4 Client Read-Write Extents Survey Client-Based I/O Extent Size Survey The rw_extent_stats histogram in the llite directory shows you the statistics for the sizes of the read-write I/O extents. This file does not maintain the per-process statistics. Example: $ cat /proc/fs/lustre/llite/lustre-ee5af200/extents_stats snapshot_time: 1213828728.348516 (secs.usecs) read | write extents calls % cum% | calls % cum% 0K - 4K : 0 0 0 | 2 2 2 4K - 8K : 0 0 0 | 0 0 2 8K - 16K : 0 0 0 | 0 0 2 16K - 32K : 0 0 0 | 20 23 26 32K - 64K : 0 0 0 | 0 0 26 64K - 128K : 0 0 0 | 51 60 86 128K - 256K : 0 0 0 | 0 0 86 256K - 512K : 0 0 0 | 0 0 86 512K - 1024K : 0 0 0 | 0 0 86 1M - 2M : 0 0 0 | 11 13 100 The file can be cleared by issuing the following command: $ echo > cat /proc/fs/lustre/llite/lustre-ee5af200/extents_stats 20-16 Lustre 1.6 Operations Manual • September 2008
Per-Process Client I/O Statistics The extents_stats_per_process file maintains the I/O extent size statistics on a per-process basis. So you can track the per-process statistics for the last MAX_PER_PROCESS_HIST processes. Example: $ cat /proc/fs/lustre/llite/lustre-ee5af200/extents_stats_per_process snapshot_time: 1213828762.204440 (secs.usecs) read | write extents calls % cum% | calls % cum% PID: 11488 0K - 4K : 0 0 0 | 0 0 0 4K - 8K : 0 0 0 | 0 0 0 8K - 16K : 0 0 0 | 0 0 0 16K - 32K : 0 0 0 | 0 0 0 32K - 64K : 0 0 0 | 0 0 0 64K - 128K : 0 0 0 | 0 0 0 128K - 256K : 0 0 0 | 0 0 0 256K - 512K : 0 0 0 | 0 0 0 512K - 1024K :0 0 0 | 0 0 0 1M - 2M : 0 0 0 | 10 100 100 PID: 11491 0K - 4K : 0 0 0 | 0 0 0 4K - 8K : 0 0 0 | 0 0 0 8K - 16K : 0 0 0 | 0 0 0 16K - 32K : 0 0 0 | 20 100 100 PID: 11424 0K - 4K : 0 0 0 | 0 0 0 4K - 8K : 0 0 0 | 0 0 0 8K - 16K : 0 0 0 | 0 0 0 16K - 32K : 0 0 0 | 0 0 0 32K - 64K : 0 0 0 | 0 0 0 64K - 128K : 0 0 0 | 16 100 100 PID: 11426 0K - 4K : 0 0 0 | 1 100 100 PID: 11429 0K - 4K : 0 0 0 | 1 100 100 Chapter 20 LustreProc 20-17
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Lustre 1.6 Operations Manual Sun M
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Please Recycle
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2. Understanding Lustre Networking
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6. Configuring Lustre - Examples 6-
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9. Configuring Quotas 9-1 9.1 Worki
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15. Backup and Restore 15-1 15.1 Lu
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20. LustreProc 20-1 20.1 /proc Entr
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22. Lustre Troubleshooting Tips 22-
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Part IV Lustre for Users 24. Free S
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29. Lustre Programming Interfaces (
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33. System Limits 33-1 33.1 Maximum
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Shell Prompts Shell C shell C shell
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xxiv Lustre 1.6 Operations Manual
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PART I Lustre Architecture Lustre i
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1.1 Lustre File System Lustre is a
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1.2.4 OSTs An OSTs provide back-end
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1.3 Files in the Lustre File System
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1.3.1 Lustre File System and Stripi
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1.3.3 Lustre System Capacity Lustre
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1.5 Lustre Networking In clusters w
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Note - Lustre does not provide redu
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Key features of LNET include: ■
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CHAPTER 3 Prerequisites This chapte
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3.2 Using a Pre-Packaged Lustre Rel
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Another option is to: 1. Install db
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3.3.4 Choosing a Proper Kernel I/O
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3.4 Memory Requirements This sectio
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CHAPTER 4 Lustre Installation This
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4.1.1 MountConf MountConf is shorth
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Note - For detailed information on
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Mounting Lustre on a client node $
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We are mounting by disk label here
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4.2.2.2 Mount with Inactive OSTs Mo
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Client mount for foo: mount -t lust
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$ mount -t lustre -L testfs-MDT0000
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$ cd /tmp/kernels/linux-2.6.9 $ rm
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Use standard RPM commands to instal
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4.3.2.2 Liblustre The Lustre librar
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4.4 Building a Lustre Source Tarbal
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CHAPTER 5 Configuring the Lustre Ne
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5.1.5 Determine Appropriate Mount P
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Note - Depending on the Linux distr
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live_router_check_interval, dead_ro
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5.2.3 Downed Routers There are two
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5.3.2 Stopping LNET Before the LNET
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CHAPTER 6 Configuring Lustre - Exam
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6.1.2 Lustre with Separate MGS and
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How to Create a CSV File Five diffe
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Linux LVM LV (Logical Volume) The C
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The lustre_config.csv file looks li
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Example 1: Simple Lustre configurat
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CHAPTER 7 More Complicated Configur
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Because megan and oscar match the f
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7.2 Elan to TCP Routing Servers meg
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7.3.3 Start clients For the TCP cli
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CHAPTER 8 Failover This chapter des
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For proper resource fencing, the He
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8.1.5 Roles of Nodes in a Failover
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8.4.3 Hardware Requirements for Fai
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8.5.1.1 Configuring Heartbeat This
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. Monitor the syslog on both nodes.
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To get the proper syntax, run: $ st
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8.6 Using MMP The multiple mount pr
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8.7.2 Configuring the Hardware Hear
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Use this procedure: 1. Create the b
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8.7.3.2 Testing 1. Pull power from
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CHAPTER 9 Configuring Quotas This c
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To enable quotas automatically when
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The lfs command now includes these
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This sets a much smaller granularit
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The quota_bunit_sz parameter displa
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9.1.5.2 Quota Limits Available quot
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Quota Event nowait_for_pending_blk_
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CHAPTER 10 RAID This chapter descri
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10.1.3 Understanding Double Failure
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10.2 Insights into Disk Performance
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OST Filesystem: RAID5 with 5 or 9 d
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10.2.1 Sample Graphs The graphs in
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10.2.1.2 Graphs for Read Performanc
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10.3 Creating an External Journal W
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CHAPTER 11 Kerberos This chapter de
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Note - The Heimdal implementation o
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General Installation Notes ■ ■
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. Install the keytab. Note - There
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# uppercase the hex nid=$(echo $nid
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11.2.2 Types of Lustre-Kerberos Fla
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11.2.2.3 Customized Flavor In most
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11.2.2.6 Rules, Syntax and Examples
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CHAPTER 12 Bonding This chapter des
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# ethtool eth1 Settings for eth1: S
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12.4 Bonding Module Parameters Bond
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The examples below are from RedHat
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12.5.1 Examples This is an example
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12.6 Configuring Lustre with Bondin
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CHAPTER 13 Upgrading Lustre The cha
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13.2.2 Supported Upgrade Paths The
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[root@mds1]# tunefs.lustre --mgs --
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13.2.5 Upgrading Multiple File Syst
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13.3 Upgrading Lustre from 1.6.3 to
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13.4 Downgrading Lustre from 1.6.4
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CHAPTER 14 Lustre SNMP Module The L
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14.3 Using the Lustre SNMP Module O
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CHAPTER 15 Backup and Restore This
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15.1.3.1 Backing Up an MDS File To
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3. Mount the filesystem. ■ For 2.
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2. Format LVM volumes as Lustre tar
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15.3.4 Restoring From Old Snapshot
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CHAPTER 16 POSIX This chapter descr
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7. When the system displays this pr
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16.3 Isolating and Debugging Failur
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If this single test is causing prob
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CHAPTER 17 Benchmarking The benchma
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Version 1.03 --Sequential Output--
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17.3 IOzone Benchmark IOZone is a f
Page 233 and 234: CHAPTER 18 Lustre Recovery This cha
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Page 237: PART III Lustre Tuning, Monitoring
Page 240 and 241: 19.1.1 Downloading an I/O Kit You c
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Page 244 and 245: 3. Determine the obdfilter instance
Page 246 and 247: 19.2.2.3 Output of the sbdfilter_su
Page 248 and 249: 19.3 PIOS Test Tool The PIOS test t
Page 250 and 251: 19.3.2 PIOS I/O Modes There are sev
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Page 254 and 255: 19.3.4 PIOS Examples To create a 1
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Page 260 and 261: 19.4.3.2 Group This section lists l
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Page 266 and 267: 19.4.3.4 Other Commands This sectio
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Page 270 and 271: 20.1 /proc Entries for Lustre This
Page 272 and 273: proc/sys/lustre/fail_loc This is th
Page 274 and 275: 20.1.3.1 Configuring Adaptive Timeo
Page 276 and 277: Note - Changing adaptive timeouts s
Page 278 and 279: Credits work like a semaphore. At s
Page 280 and 281: 20.2 Lustre I/O Tunables The sectio
Page 282 and 283: 20.2.2 Watching the Client RPC Stre
Page 286 and 287: 20.2.5 Watching the OST Block I/O S
Page 288 and 289: 20.2.7 mballoc History /proc/fs/ldi
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Page 292 and 293: 20.2.9 Locking /proc/fs/lustre/ldlm
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Page 300 and 301: 21.1.0.1 OSS Service Thread Count T
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Page 304 and 305: 21.3.3.3 Number of Inodes for OST F
Page 306 and 307: 21.5.3 Setting Write-Back Cache Per
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Page 310 and 311: 21.7 Lockless I/O Tunables The lock
Page 312 and 313: 22.1.2 Lustre Logs The error messag
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Page 318 and 319: 22.3.6 Changing Parameters You can
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Page 322 and 323: 22.3.12 Handling/Debugging "Bind: A
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Page 326 and 327: 22.3.17 Handling/Debugging "LustreE
Page 328 and 329: 22.3.22 Number of OSTs Needed for S
Page 330 and 331: 23.1 Lustre Debug Messages Each Lus
Page 332 and 333: 23.2 Tools for Lustre Debugging The
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debug_daemon stop Completely shuts
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4. If you already have a debug log
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23.2.8 Adding Debugging to the Lust
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23.3 Troubleshooting with strace Th
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23.4.1 Determine the Lustre UUID of
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23-16 Lustre 1.6 Operations Manual
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CHAPTER 24 Free Space and Quotas Th
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Examples [lin-cli1] $ lfs df UUID 1
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CHAPTER 25 Striping and I/O Options
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25.1.2 Disadvantages of Striping Th
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You can also use ls -l /proc//fd/ t
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25.3.1 Changing Striping for a Subd
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25.4.1 Round-Robin Allocator When O
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25.6 Other I/O Options This section
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if (close(fd) < 0) { fprintf(stderr
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} /* Ping all OSTs that belong to t
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CHAPTER 26 Lustre Security This cha
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Lustre ACL support is a system-wide
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The root squash UID and GID can be
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CHAPTER 27 Lustre Operating Tips Th
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27.2 A Simple Data Migration Script
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27.4 Failures Running a Client and
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PART V Reference This part includes
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28.1 lfs The lfs utility can be use
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Options The various lfs options are
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Option Description setstripe Create
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Option Description help Provides br
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$ lfs quotacheck -ug /mnt/lustre Ch
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Options The options and description
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Example e2fsck -n -v --mdsdb /tmp/m
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lustre-OST0000: ******* WARNING: Fi
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To fix dangling inodes, lfsck creat
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Options The options and description
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28.5 Handling Timeouts Timeouts are
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29.1.2 Description The group upcall
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Description The llapi_file_create()
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30.1.2 llapi_file_get_stripe Use ll
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30.1.4 llapi_quotactl Use llapi_quo
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Return Values llapi_quotactl() retu
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Important: All old (pre v.1.4.6) Lu
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ip2nets ("") is a string that lists
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The expansion is a list enclosed in
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31.2.2 SOCKLND Kernel TCP/IP LND Th
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31.2.3 QSW LND The QSW LND (qswlnd)
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31.2.5 VIB LND The VIB LND is conne
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31.2.6 OpenIB LND The OpenIB LND is
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ME/MD Queue Length The ptllnd uses
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31.2.8 Portals LND (Catamount) The
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31.2.9 MX LND MXLND supports a numb
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32.1 mkfs.lustre The mkfs.lustre ut
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Option Description --stripe-count-h
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Option Description --index=index Fo
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32.3 lctl The lctl utility is used
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Device Operations Option Descriptio
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Options Use the following options t
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32.4 mount.lustre The mount.lustre
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In addition to the standard mount o
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Options Option Description -b inode
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offset_stats The client offset_stat
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32.5.8 Fast e2fsck Using the uninit
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32.5.10 llobdstat The llobdstat uti
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Example To monitor /proc/fs/lustre/
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LNET self-test includes two user ut
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32.5.14 routerstat The routerstat u
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33.2 Maximum Stripe Size For a 32-b
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33.9 MDS Space Consumption A single
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Modules LNET acceptor accept_port a
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VIB LND service_number arp_retries
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A-6 Lustre 1.6 Operations Manual
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Administrator Tasks Build Install n
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Manual Version Date Details of Edit
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C-8 Lustre 1.6 Operations Manual
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Can I run Lustre in a heterogeneous
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How do I abort recovery? Why would
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Filesystem refuses to mount because
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Is it possible to change the IP add
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Can I change the striping of a file
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How do I resize an MDS / OST filesy
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1. Make a mountpoint for the mkdir
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How do I control multiple services
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Note - CluManager requires two 10M
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1. Try: lconf --cleanup --force 2.
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The following computation is used t
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Example 2: Servers have two tcp net
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If you determine the LAST_ID file o
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Information on the Socket LND (sock
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What should I do if I suspect devic
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In most cases, running e2fsck -fp $
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What operations take place in Lustr
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What is the Lustre data path? On th
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D-38 Lustre 1.6 Operations Manual
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Completion Callback Configlog Confi
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GSS Group Sweeping Scheduling. A di
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LOV LOV descriptor Lustre Lustre cl
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opencache Orphan objects Orphan han
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S Storage Object API Storage Object
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Glossary-12 Lustre 1.6 Operations M
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failover, 4-10 filesystem name, 4-8
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Lustre building, 4-18 building a ta
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Q QSW LND, 31-10 Quadrics Elan, 2-2
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Index-8 Lustre 1.6 Operations Manua
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