Lustre 1.6 Operations Manual

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CHAPTER 28 User Utilities (man1) This chapter describes user utilities and includes the following sections: ■ ■ ■ ■ lfs lfsck Filefrag Handling Timeouts 28-1
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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
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CHAPTER 18 Lustre Recovery This cha
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18.2.2 MDS Failure (and Failover) R
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PART III Lustre Tuning, Monitoring
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19.1.1 Downloading an I/O Kit You c
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The sgpdd_survey script must be cus
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3. Determine the obdfilter instance
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19.2.2.3 Output of the sbdfilter_su
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19.3 PIOS Test Tool The PIOS test t
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19.3.2 PIOS I/O Modes There are sev
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Offset(o): Distance between two suc
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19.3.4 PIOS Examples To create a 1
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19.4.1.2 Utilities LNET self-test h
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Note - This script can be easily ad
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19.4.3.2 Group This section lists l
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del_group NAME Removes a group from
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There are only two test types: --pi
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19.4.3.4 Other Commands This sectio
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show_error [--session] [GROUP]|[IDs
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20.1 /proc Entries for Lustre This
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proc/sys/lustre/fail_loc This is th
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20.1.3.1 Configuring Adaptive Timeo
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Note - Changing adaptive timeouts s
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Credits work like a semaphore. At s
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20.2 Lustre I/O Tunables The sectio
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20.2.2 Watching the Client RPC Stre
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20.2.4 Client Read-Write Extents Su
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20.2.5 Watching the OST Block I/O S
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20.2.7 mballoc History /proc/fs/ldi
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Number of groups scanned (grps colu
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20.2.9 Locking /proc/fs/lustre/ldlm
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20.3.1 RPC Information for Other OB
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Where: Parameter Cur. Count Cur. Ra
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20-30 Lustre 1.6 Operations Manual
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21.1.0.1 OSS Service Thread Count T
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21.3 Options to Format MDT and OST
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21.3.3.3 Number of Inodes for OST F
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21.5.3 Setting Write-Back Cache Per
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For example, one OST per tier LUNLa
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21.7 Lockless I/O Tunables The lock
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22.1.2 Lustre Logs The error messag
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22.3 Lustre Performance Tips This s
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22.3.4 OSTs Become Read-Only If the
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22.3.6 Changing Parameters You can
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22.3.8 Default Striping These are t
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22.3.12 Handling/Debugging "Bind: A
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You may also receive this error if
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22.3.17 Handling/Debugging "LustreE
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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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Page 336 and 337: 4. If you already have a debug log
Page 338 and 339: 23.2.8 Adding Debugging to the Lust
Page 340 and 341: 23.3 Troubleshooting with strace Th
Page 342 and 343: 23.4.1 Determine the Lustre UUID of
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Page 347 and 348: CHAPTER 24 Free Space and Quotas Th
Page 349 and 350: Examples [lin-cli1] $ lfs df UUID 1
Page 351 and 352: CHAPTER 25 Striping and I/O Options
Page 353 and 354: 25.1.2 Disadvantages of Striping Th
Page 355 and 356: You can also use ls -l /proc//fd/ t
Page 357 and 358: 25.3.1 Changing Striping for a Subd
Page 359 and 360: 25.4.1 Round-Robin Allocator When O
Page 361 and 362: 25.6 Other I/O Options This section
Page 363 and 364: if (close(fd) < 0) { fprintf(stderr
Page 365 and 366: } /* Ping all OSTs that belong to t
Page 367 and 368: CHAPTER 26 Lustre Security This cha
Page 369 and 370: Lustre ACL support is a system-wide
Page 371 and 372: The root squash UID and GID can be
Page 373 and 374: CHAPTER 27 Lustre Operating Tips Th
Page 375 and 376: 27.2 A Simple Data Migration Script
Page 377 and 378: 27.4 Failures Running a Client and
Page 379: PART V Reference This part includes
Page 383 and 384: lfs setquota [-u|--user|-g|--group]
Page 385 and 386: Option Description --print0 Prints
Page 387 and 388: Option Description quotachown [-i]
Page 389 and 390: $ lfs find /mnt/lustre Efficiently
Page 391 and 392: 28.2 lfsck The e2fsprogs package co
Page 393 and 394: Description If an MDS or an OST bec
Page 395 and 396: 3. Make this file accessible on all
Page 397 and 398: Example: lfsck -n -v --mdsdb /home/
Page 399 and 400: 28.3 Filefrag The e2fsprogs package
Page 401 and 402: 28.4 Mount Lustre uses the standard
Page 403 and 404: CHAPTER 29 Lustre Programming Inter
Page 405 and 406: 29.1.3 Parameters ■ ■ Name of t
Page 407 and 408: CHAPTER 30 Setting Lustre Propertie
Page 409 and 410: Examples System default size is 4MB
Page 411 and 412: 30.1.3 llapi_file_open The llapi_fi
Page 413 and 414: Description The llapi_quotactl() co
Page 415 and 416: CHAPTER 31 Configuration Files and
Page 417 and 418: 31.2.1 LNET Options This section de
Page 419 and 420: Here is a more complicated situatio
Page 421 and 422: 31.2.1.4 forwarding ("") This is a
Page 423 and 424: Variable keepalive_idle (30,Wc) kee
Page 425 and 426: 31.2.4 RapidArray LND The RapidArra
Page 427 and 428: Variable rnr_cnt (6,Wc) rnr_nak_tim
Page 429 and 430: 31.2.7 Portals LND (Linux) The Port
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Variable credits (128) peercredits
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The following environment variables
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To obtain the optimal performance f
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CHAPTER 32 System Configuration Uti
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Option Description --failnode=nid,.
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32.2 tunefs.lustre The tunefs.lustr
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Examples Changing the MGS’s NID a
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Network Configuration Option Descri
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Virtual Block Device Operations Lus
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Examples lctl $ lctl lctl > dl 0 UP
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Options Option Description :=[:] Th
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32.5 New Utilities in Lustre 1.6 Th
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32.5.4 Application Profiling Utilit
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32.5.7 Flock Feature Lustre now inc
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32.5.9 l_getgroups The l_getgroups
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32.5.11 llstat The llstat utility d
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32.5.12 lst The lst utility starts
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32.5.13 plot-llstat The plot-llstat
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CHAPTER 33 System Limits This chapt
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33.6 Maximum Size of a Filesystem F
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33.12 OSS RAM Size for a Single OST
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APPENDIX A Feature List Networks TC
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QSW LND tx_maxconfig ntxmsgs nnblk_
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Portals LND (Linux) ntx concurrent_
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APPENDIX B Task List Key Concepts s
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APPENDIX C Version Log Manual Versi
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Manual Version Date Details of Edit
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APPENDIX D Lustre Knowledge Base Th
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How can I check if a filesystem is
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What does "denying connection for n
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Now for the LOVs: lmc -m test.xml -
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How do I set striping for a large n
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How do I configure recoverable / fa
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How do I backup / restore a Lustre
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9. Format the new device. The easie
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What extra resources are required f
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To see which node is serving that O
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Currently (v1.4.5) the Voltaire IB
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1. Shut down all clients and server
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How to fix bad LAST_ID on an OST Th
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Why can't I run an OST and a client
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Information on the Lustre Networkin
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In many cases, the extent of corrup
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How do I determine which Lustre ser
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■ On the journal: ext3 journaling
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When mounting an MDT filesystm, the
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Glossary A ACL Administrative OST f
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F Failback Failout OST Failover FID
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LDLM lfind lfs lfsck liblustre Llit
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MGS Management Service. A software
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Portal A concept used by LNET. LNET
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W Wide striping Strategy of using m
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Index Numerics 1.6 utilities, 32-17
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file formats, quotas, 9-11 file str
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modprobe.conf, 7-1, 7-5, 7-6 module
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vib (Voltaire InfiniBand), 2-2 T ta
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