Lustre 1.6 Operations Manual

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5.1.3 Identify Network Interfaces to Include/Exclude from LNET By default, LNET uses all interfaces for a given network type. If there are interfaces it should not use, (such as administrative networks, IP over IB, and so on), then the included interfaces should be explicitly listed. 5.1.4 Determine Cluster-wide Module Configuration The LNET configuration is managed via module options, typically specified in /etc/modprobe.conf or /etc/modprobe.conf.local (depending on the distribution). To help ease the maintenance of large clusters, it is possible to configure the networking setup for all nodes through a single, unified set of options in the modprobe.conf file on each node. For more information, see the ip2nets option in Modprobe.conf. Users of liblustre should set the accept=all parameter. For details, see Module Parameters. 5-2 Lustre 1.7 Operations Manual • September 2008
5.1.5 Determine Appropriate Mount Parameters for Clients In their mount commands, clients use the NID of the MDS host to retrieve their configuration information. Since an MDS may have more than one NID, a client should use the appropriate NID for its local network. If you are unsure which NID to use, there is a lctl command that can help. MDS On the MDS, run: lctl list_nids This displays the server's NIDs. Client On a client, run: lctl which_nid This displays the closest NID for the client. Client with SSH Access From a client with SSH access to the MDS, run: mds_nids=`ssh the_mds lctl list_nids` lctl which_nid $mds_nids This displays, generally, the correct NID to use for the MDS in the mount command. Chapter 5 Configuring the Lustre Network 5-3
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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
Page 34 and 35: 1.2.4 OSTs An OSTs provide back-end
Page 36 and 37: 1.3 Files in the Lustre File System
Page 38 and 39: 1.3.1 Lustre File System and Stripi
Page 40 and 41: 1.3.3 Lustre System Capacity Lustre
Page 42 and 43: 1.5 Lustre Networking In clusters w
Page 44 and 45: Note - Lustre does not provide redu
Page 46 and 47: Key features of LNET include: ■
Page 49 and 50: CHAPTER 3 Prerequisites This chapte
Page 51 and 52: 3.2 Using a Pre-Packaged Lustre Rel
Page 53 and 54: Another option is to: 1. Install db
Page 55 and 56: 3.3.4 Choosing a Proper Kernel I/O
Page 57 and 58: 3.4 Memory Requirements This sectio
Page 59 and 60: CHAPTER 4 Lustre Installation This
Page 61 and 62: 4.1.1 MountConf MountConf is shorth
Page 63 and 64: Note - For detailed information on
Page 65 and 66: Mounting Lustre on a client node $
Page 67 and 68: We are mounting by disk label here
Page 69 and 70: 4.2.2.2 Mount with Inactive OSTs Mo
Page 71 and 72: Client mount for foo: mount -t lust
Page 73 and 74: $ mount -t lustre -L testfs-MDT0000
Page 75 and 76: $ cd /tmp/kernels/linux-2.6.9 $ rm
Page 77 and 78: 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: CHAPTER 5 Configuring the Lustre Ne
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
Page 107 and 108: CHAPTER 7 More Complicated Configur
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 and 130: 8.6 Using MMP The multiple mount pr
Page 131 and 132: 8.7.2 Configuring the Hardware Hear
Page 133 and 134: 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
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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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