Lustre 1.6 Operations Manual

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3. Run the IOZone software (per the ReadMe file accompanied with the IOZone software). Sample Output Iozone: Performance Test of File I/O Version $Revision: 3.263 $ Compiled for 32 bit mode. Build: linux Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins, Al Slater, Scott Rhine, Mike Wisner, Ken Goss, Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Jean-Marc Zucconi, Jeff Blomberg, Erik Habbinga, Kris Strecker, Walter Wong. Run began: Fri Sep 29 15:37:07 2006 Network distribution mode enabled. Command line used: ./iozone -+m test.txt Output is in Kbytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 Kbytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 512 4 194309 406651 728276 792701 715002 498592 638351 700365 587235 190554 378448 686267 765201 iozone test complete. 17-6 Lustre 1.6 Operations Manual • September 2008
CHAPTER 18 Lustre Recovery This chapter describes how to recover Lustre, and includes the following sections: ■ ■ Recovering Lustre Types of Failure Lustre offers substantial recovery support to deal with node or network failure, and returns the cluster to a reliable, functional state. When Lustre is in recovery mode, it means that the servers (MDS/OSS), judge there is a stop of filesystem in an unclean state. In other words, unsaved data may be in the client cache. To save this data, the filesystem re-starts in recovery mode and makes the clients write the data to disk. 18.1 Recovering Lustre In Lustre recovery mode, the servers attempt to contact all clients and request they replay their transactions. If all clients are contacted and they are recoverable (they have not rebooted), then recovery proceeds and the filesystem comes back with the cached client-side data safely saved to disk. If one or more clients are not able to reconnect (due to hardware failures or client reboots), then the recovery process times out, which causes all clients to be expelled. In this case, if there is any unsaved data in the client cache, it is not saved to disk and is lost. This is an unfortunate side effect of allowing Lustre to keep data consistent on disk. 18-1
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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
Page 181 and 182: CHAPTER 12 Bonding This chapter des
Page 183 and 184: # ethtool eth1 Settings for eth1: S
Page 185 and 186: 12.4 Bonding Module Parameters Bond
Page 187 and 188: The examples below are from RedHat
Page 189 and 190: 12.5.1 Examples This is an example
Page 191 and 192: 12.6 Configuring Lustre with Bondin
Page 193 and 194: CHAPTER 13 Upgrading Lustre The cha
Page 195 and 196: 13.2.2 Supported Upgrade Paths The
Page 197 and 198: [root@mds1]# tunefs.lustre --mgs --
Page 199 and 200: 13.2.5 Upgrading Multiple File Syst
Page 201 and 202: 13.3 Upgrading Lustre from 1.6.3 to
Page 203 and 204: 13.4 Downgrading Lustre from 1.6.4
Page 205 and 206: CHAPTER 14 Lustre SNMP Module The L
Page 207 and 208: 14.3 Using the Lustre SNMP Module O
Page 209 and 210: CHAPTER 15 Backup and Restore This
Page 211 and 212: 15.1.3.1 Backing Up an MDS File To
Page 213 and 214: 3. Mount the filesystem. ■ For 2.
Page 215 and 216: 2. Format LVM volumes as Lustre tar
Page 217 and 218: 15.3.4 Restoring From Old Snapshot
Page 219 and 220: CHAPTER 16 POSIX This chapter descr
Page 221 and 222: 7. When the system displays this pr
Page 223 and 224: 16.3 Isolating and Debugging Failur
Page 225 and 226: If this single test is causing prob
Page 227 and 228: CHAPTER 17 Benchmarking The benchma
Page 229 and 230: Version 1.03 --Sequential Output--
Page 231: 17.3 IOzone Benchmark IOZone is a f
Page 235 and 236: 18.2.2 MDS Failure (and Failover) R
Page 237: PART III Lustre Tuning, Monitoring
Page 240 and 241: 19.1.1 Downloading an I/O Kit You c
Page 242 and 243: The sgpdd_survey script must be cus
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
Page 252 and 253: Offset(o): Distance between two suc
Page 254 and 255: 19.3.4 PIOS Examples To create a 1
Page 256 and 257: 19.4.1.2 Utilities LNET self-test h
Page 258 and 259: Note - This script can be easily ad
Page 260 and 261: 19.4.3.2 Group This section lists l
Page 262 and 263: del_group NAME Removes a group from
Page 264 and 265: There are only two test types: --pi
Page 266 and 267: 19.4.3.4 Other Commands This sectio
Page 268 and 269: show_error [--session] [GROUP]|[IDs
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
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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
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23.1 Lustre Debug Messages Each Lus
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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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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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