Lustre 1.6 Operations Manual

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8.7 Setting Up Failover with Heartbeat V2 This section describes how to set up failover with Heartbeat V2. 8.7.1 Installing the Software 1. Install Lustre (see Installing Lustre). 2. Install RPMs required for configuring Heartbeat. The following packages are needed for Heartbeat (v2). We used the 2.0.4 version of Heartbeat. Heartbeat packages, in order: ■ heartbeat-stonith -> heartbeat-stonith-2.0.4-1.i586.rpm ■ heartbeat-pils -> heartbeat-pils-2.0.4-1.i586.rpm ■ heartbeat itself -> heartbeat-2.0.4-1.i586.rpm You can find all the RPMs at the following location: http://linux-ha.org/download/index.html#2.0.4 3. Satisfy the installation prerequisites. To install Heartbeat 2.0.4-1, you require: ■ Python ■ openssl ■ libnet-> libnet-1.1.2.1-19.i586.rpm ■ ■ ■ ■ ■ ■ ■ libpopt -> popt-1.7-274.i586.rpm librpm -> rpm-4.1.1-222.i586.rpm libtld- > libtool-ltdl-1.5.16.multilib2-3.i386.rpm lingnutls -> gnutls-1.2.10-1.i386.rpm Libzo -> lzo2-2.02-1.1.fc3.rf.i386.rpm glib -> glib-2.6.1-2.i586.rpm glib-devel -> glib-devel-2.6.1-2.i586.rpm 8-16 Lustre 1.6 Operations Manual • September 2008
8.7.2 Configuring the Hardware Heartbeat v2 runs well with an un-altered v1 configuration. This makes upgrading simple. You can test the basic function and quickly roll back if issues appear. Heartbeat v2 does not require a virtual IP address to be associated with a resource. This is good since we do not use virtual IPs. Heartbeat v2 supports multi-node clusters (of more than two nodes), though it has not been tested for a multi-node cluster. This section describes only the two-node case. The multi-node setup adds a score value to the resource configuration. This value is used to decide the proper node for a resource when failover occurs. Heartbeat v2 adds a resource manager (crm). The resource configuration is maintained as an XML file. This file is re-written by the cluster frequently. Any alterations to the configuration should be made with the HA tools or when the cluster is stopped. 8.7.2.1 Hardware Preconditions ■ ■ ■ ■ ■ ■ The basic cluster assumptions are the same as those for Heartbeat v1. For the sake of clarity, here are the preconditions: The setup must consist of a failover pair where each node of the pair has access to shared storage. If possible, the storage paths should be identical (d1_q_0:/dev/sda == d2_q_0:/dev/sda). Shared storage can be arranged in an active/passive (MDS,OSS) or active/active (OSS only) configuration. Each shared resource will have a primary (default) node. The secondary node is assumed. The two nodes must have one or more communication paths for heartbeat traffic. A communication path can be: ■ Dedicated Ethernet ■ Serial live (serial crossover cable) Failure of all heartbeat communication is not good. This condition is called “splitbrain” and the heartbeat software will resolve this situation by powering down one node. The two nodes must have a method to control each other's state. The Remote Power Control hardware is the best. There must be a script to start and stop a given node from the other node. STONITH provides soft power control methods (ssh, meatware) but these cannot be used in a production situation. Heartbeat provides a remote ping service that is used to monitor the health of the external network. If you wish to use the ipfail service, you must have a very reliable external address to use as the ping target. Chapter 8 Failover 8-17
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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
Page 79 and 80: 4.3.2.2 Liblustre The Lustre librar
Page 81 and 82: 4.4 Building a Lustre Source Tarbal
Page 83 and 84: CHAPTER 5 Configuring the Lustre Ne
Page 85 and 86: 5.1.5 Determine Appropriate Mount P
Page 87 and 88: Note - Depending on the Linux distr
Page 89 and 90: live_router_check_interval, dead_ro
Page 91 and 92: 5.2.3 Downed Routers There are two
Page 93 and 94: 5.3.2 Stopping LNET Before the LNET
Page 95 and 96: CHAPTER 6 Configuring Lustre - Exam
Page 97 and 98: 6.1.2 Lustre with Separate MGS and
Page 99 and 100: How to Create a CSV File Five diffe
Page 101 and 102: Linux LVM LV (Logical Volume) The C
Page 103 and 104: The lustre_config.csv file looks li
Page 105 and 106: Example 1: Simple Lustre configurat
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Page 109 and 110: Because megan and oscar match the f
Page 111 and 112: 7.2 Elan to TCP Routing Servers meg
Page 113 and 114: 7.3.3 Start clients For the TCP cli
Page 115 and 116: CHAPTER 8 Failover This chapter des
Page 117 and 118: For proper resource fencing, the He
Page 119 and 120: 8.1.5 Roles of Nodes in a Failover
Page 121 and 122: 8.4.3 Hardware Requirements for Fai
Page 123 and 124: 8.5.1.1 Configuring Heartbeat This
Page 125 and 126: . Monitor the syslog on both nodes.
Page 127 and 128: To get the proper syntax, run: $ st
Page 129: 8.6 Using MMP The multiple mount pr
Page 133 and 134: Use this procedure: 1. Create the b
Page 135 and 136: 8.7.3.2 Testing 1. Pull power from
Page 137 and 138: CHAPTER 9 Configuring Quotas This c
Page 139 and 140: To enable quotas automatically when
Page 141 and 142: The lfs command now includes these
Page 143 and 144: This sets a much smaller granularit
Page 145 and 146: The quota_bunit_sz parameter displa
Page 147 and 148: 9.1.5.2 Quota Limits Available quot
Page 149 and 150: Quota Event nowait_for_pending_blk_
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
Page 173 and 174: # uppercase the hex nid=$(echo $nid
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
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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
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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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Lustre 1.6 Operations Manual

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