Lustre 1.6 Operations Manual

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Note – If your system is upgraded from 1.4.x to 1.6.x, you can mount the Lustre client on both Lustre versions. If the file system was originallycreated using Lustre 1.6.x, then you will not be able to mount the fildsystem created using an earlier Lustre version. 13.2.3 Starting Clients You can start a new client with an old MDT by using the old format of the client mount command: client# mount -t lustre ://client You can start a new client with an upgraded MDT by using the new format and pointing it at the MGS, not the MDT (for co-located MDT/MGS, this is the same): client# mount -t lustre :/ Old clients always use the old format of the mount command, regardless of whether the MDT has been upgraded or not. 13.2.4 Upgrading a Single File system tunefs.lustre will find the old client log on an 1.4.x MDT that is being upgraded to 1.6. (If the name of the client log is not "client", use the lustre_up14.sh script, described in Step 2 and Step 3.) 1. Shut down the MDT. mdt1# lconf --failover --cleanup config.xml 2. Install the new Lustre version and run tunefs.lustre to upgrade the configuration. There are two options: ■ Rolling upgrade keeps a copy of the original configuration log, allowing immediate reintegration into a live file system, but prevents OSC parameter and failover NID changes. (The writeconf procedure can be performed later to eliminate these restrictions. For details, see Running the Writeconf Command.) ■ mdt1# tunefs.lustre --mgs --mdt --fsname=testfs /dev/sda1 i.--writeconf begins a new configuration log, allowing permanent modification of all parameters (see Changing Parameters), but requiring all other servers and clients to be stopped at this point. No clients can be started until all OSTs are upgraded. 13-4 Lustre 1.6 Operations Manual • September 2008
[root@mds1]# tunefs.lustre --mgs --writeconf --mgs --mdt -- fsname=ldiskfs /dev/hda4 checking for existing Lustre data: found CONFIGS/mountdata Reading CONFIGS/mountdata Read previous values: Target: testfs-MDT0000 Index: 0 UUID: mds-1_UUID Lustre FS: testfs Mount type: ldiskfs Flags: 0x205 (MDT MGS upgrade1.4 ) Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr Parameters: Permanent disk data: Target: ldiskfs-MDT0000 Index: 0 UUID: mds-1_UUID Lustre FS: ldiskfs Mount type: ldiskfs Flags: 0x305 (MDT MGS writeconf upgrade1.4 ) Persistent mount opts: errors=remount-ro,iopen_nopriv,user_xattr Parameters: Writing CONFIGS/mountdata Copying old logs 3. Start the upgraded MDT. mdt1# mkdir -p /mnt/test/mdt mdt1# mount -t lustre /dev/hda4 /mnt/test/mdt mdt1 # df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 10080520 4600820 4967632 49% / /dev/hda1 101086 14787 81080 16% /boot none 501000 0 501000 0% /dev/shm /dev/hda4 23339176 455236 21550144 3% /mnt/test/mdt Chapter 13 Upgrading Lustre 13-5
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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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Page 151 and 152: CHAPTER 10 RAID This chapter descri
Page 153 and 154: 10.1.3 Understanding Double Failure
Page 155 and 156: 10.2 Insights into Disk Performance
Page 157 and 158: OST Filesystem: RAID5 with 5 or 9 d
Page 159 and 160: 10.2.1 Sample Graphs The graphs in
Page 161 and 162: 10.2.1.2 Graphs for Read Performanc
Page 163 and 164: 10.3 Creating an External Journal W
Page 165 and 166: CHAPTER 11 Kerberos This chapter de
Page 167 and 168: Note - The Heimdal implementation o
Page 169 and 170: General Installation Notes ■ ■
Page 171 and 172: . Install the keytab. Note - There
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Page 175 and 176: 11.2.2 Types of Lustre-Kerberos Fla
Page 177 and 178: 11.2.2.3 Customized Flavor In most
Page 179 and 180: 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
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Page 205 and 206: CHAPTER 14 Lustre SNMP Module The L
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Page 209 and 210: CHAPTER 15 Backup and Restore This
Page 211 and 212: 15.1.3.1 Backing Up an MDS File To
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Page 223 and 224: 16.3 Isolating and Debugging Failur
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Page 227 and 228: CHAPTER 17 Benchmarking The benchma
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Page 231 and 232: 17.3 IOzone Benchmark IOZone is a f
Page 233 and 234: CHAPTER 18 Lustre Recovery This cha
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
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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
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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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