Lustre 1.6 Operations Manual

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4.2.2.5 Failout Designate an OST as a "failout", so clients receive errors after a timeout instead of waiting for recovery: $ mkfs.lustre --fsname=testfs --ost --mgsnode=uml1 \ -- param="failover.mode=failout" /dev/sdb 4.2.2.6 Running Multiple Lustre Filesystems The default filesystem name created by mkfs.lustre is lustre. For a different filesystem name, specify mkfs.lustre --fsname=foo. The MDT, OSTs and clients that comprise a single filesystem must share the same name. For example: foo-MDT0000 foo-OST0000 foo-OST0001 client mount command: mount -t lustre mgsnode:/foo /mnt/mountpoint The maximum length of the filesystem name is 8 characters. The MGS is universal; there is only one MGS per installation, not per filesystem. Note – There is only one filesystem per MDT. Therefore, specify --mdt --mgs on one, and --mdt --mgsnode= on the others. An installation with two filesystems could look like this: mgsnode# mkfs.lustre --mgs /dev/sda mdtfoonode# mkfs.lustre --fsname=foo --mdt --mgsnode=mgsnode@tcp0 /dev/sda ossfoonode# mkfs.lustre --fsname=foo --ost --mgsnode=mgsnode@tcp0 /dev/sda ossfoonode# mkfs.lustre --fsname=foo --ost --mgsnode=mgsnode@tcp0 /dev/sdb mdtbarnode# mkfs.lustre --fsname=bar --mdt --mgsnode=mgsnode@tcp0 /dev/sda ossbarnode# mkfs.lustre --fsname=bar --ost --mgsnode=mgsnode@tcp0 /dev/sda ossbarnode# mkfs.lustre --fsname=bar --ost --mgsnode=mgsnode@tcp0 /dev/sdb 4-12 Lustre 1.6 Operations Manual • September 2008
Client mount for foo: mount -t lustre mgsnode@tcp0:/foo /mnt/work Client mount for bar: mount -t lustre mgsnode@tcp0:/bar /mnt/scratch 4.2.3 Other Configuration Tasks This section describes other Lustre configuration tasks. 4.2.3.1 Removing an OST In Lustre 1.6, an OST can be permanently removed from a filesystem. Any files that have stripes on the removed OST will, in the future, return EIO. $ mgs> lctl --device conf_param testfs-OST0001.osc.active=0 This tells any clients of the OST that it should not be contacted; the OSTs current state is irrelevant. To remove an OST: 1. Deactivate the OST (make it read-only) on the MDS so no new objects are allocated to it. Use lctl --device to deactivate on the MDS and clients to deactivate an OST temporarily. 2 2. Use lfs find to discover all files that have objects residing on the deactivated OST. 3. Copy these files to a new location and then move them back to their original location to force their object re-creation on the active OSTs and the object deletion on the OST to be removed. To restore the OST: 1. Make sure the OST is running. 2. Run this command: $ mgs> lctl --device conf_param testfs-OST0001.osc.active=1 2. Do not use lctl conf_param to deactivate the OST. It permanently sets a parameter in the filesystem configuration. Chapter 4 Lustre Installation 4-13
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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
Page 20 and 21: 29. Lustre Programming Interfaces (
Page 22 and 23: 33. System Limits 33-1 33.1 Maximum
Page 24 and 25: Shell Prompts Shell C shell C shell
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Page 29: PART I Lustre Architecture Lustre i
Page 32 and 33: 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
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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 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
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
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8.4.3 Hardware Requirements for Fai
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8.5.1.1 Configuring Heartbeat This
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. Monitor the syslog on both nodes.
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To get the proper syntax, run: $ st
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8.6 Using MMP The multiple mount pr
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8.7.2 Configuring the Hardware Hear
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Use this procedure: 1. Create the b
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8.7.3.2 Testing 1. Pull power from
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CHAPTER 9 Configuring Quotas This c
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To enable quotas automatically when
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The lfs command now includes these
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This sets a much smaller granularit
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The quota_bunit_sz parameter displa
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9.1.5.2 Quota Limits Available quot
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Quota Event nowait_for_pending_blk_
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CHAPTER 10 RAID This chapter descri
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10.1.3 Understanding Double Failure
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10.2 Insights into Disk Performance
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OST Filesystem: RAID5 with 5 or 9 d
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10.2.1 Sample Graphs The graphs in
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10.2.1.2 Graphs for Read Performanc
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10.3 Creating an External Journal W
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CHAPTER 11 Kerberos This chapter de
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Note - The Heimdal implementation o
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General Installation Notes ■ ■
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. Install the keytab. Note - There
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# uppercase the hex nid=$(echo $nid
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11.2.2 Types of Lustre-Kerberos Fla
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11.2.2.3 Customized Flavor In most
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11.2.2.6 Rules, Syntax and Examples
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CHAPTER 12 Bonding This chapter des
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# ethtool eth1 Settings for eth1: S
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12.4 Bonding Module Parameters Bond
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The examples below are from RedHat
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12.5.1 Examples This is an example
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12.6 Configuring Lustre with Bondin
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CHAPTER 13 Upgrading Lustre The cha
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13.2.2 Supported Upgrade Paths The
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[root@mds1]# tunefs.lustre --mgs --
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13.2.5 Upgrading Multiple File Syst
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13.3 Upgrading Lustre from 1.6.3 to
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13.4 Downgrading Lustre from 1.6.4
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CHAPTER 14 Lustre SNMP Module The L
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14.3 Using the Lustre SNMP Module O
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CHAPTER 15 Backup and Restore This
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15.1.3.1 Backing Up an MDS File To
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3. Mount the filesystem. ■ For 2.
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2. Format LVM volumes as Lustre tar
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15.3.4 Restoring From Old Snapshot
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CHAPTER 16 POSIX This chapter descr
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7. When the system displays this pr
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16.3 Isolating and Debugging Failur
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If this single test is causing prob
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CHAPTER 17 Benchmarking The benchma
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Version 1.03 --Sequential Output--
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17.3 IOzone Benchmark IOZone is a f
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CHAPTER 18 Lustre Recovery This cha
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18.2.2 MDS Failure (and Failover) R
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PART III Lustre Tuning, Monitoring
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19.1.1 Downloading an I/O Kit You c
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The sgpdd_survey script must be cus
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3. Determine the obdfilter instance
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19.2.2.3 Output of the sbdfilter_su
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19.3 PIOS Test Tool The PIOS test t
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19.3.2 PIOS I/O Modes There are sev
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Offset(o): Distance between two suc
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19.3.4 PIOS Examples To create a 1
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19.4.1.2 Utilities LNET self-test h
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Note - This script can be easily ad
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19.4.3.2 Group This section lists l
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del_group NAME Removes a group from
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There are only two test types: --pi
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19.4.3.4 Other Commands This sectio
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show_error [--session] [GROUP]|[IDs
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20.1 /proc Entries for Lustre This
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proc/sys/lustre/fail_loc This is th
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20.1.3.1 Configuring Adaptive Timeo
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Note - Changing adaptive timeouts s
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Credits work like a semaphore. At s
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20.2 Lustre I/O Tunables The sectio
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20.2.2 Watching the Client RPC Stre
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20.2.4 Client Read-Write Extents Su
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20.2.5 Watching the OST Block I/O S
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20.2.7 mballoc History /proc/fs/ldi
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Number of groups scanned (grps colu
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20.2.9 Locking /proc/fs/lustre/ldlm
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20.3.1 RPC Information for Other OB
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Where: Parameter Cur. Count Cur. Ra
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20-30 Lustre 1.6 Operations Manual
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21.1.0.1 OSS Service Thread Count T
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21.3 Options to Format MDT and OST
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21.3.3.3 Number of Inodes for OST F
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21.5.3 Setting Write-Back Cache Per
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For example, one OST per tier LUNLa
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21.7 Lockless I/O Tunables The lock
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22.1.2 Lustre Logs The error messag
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22.3 Lustre Performance Tips This s
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22.3.4 OSTs Become Read-Only If the
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22.3.6 Changing Parameters You can
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22.3.8 Default Striping These are t
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22.3.12 Handling/Debugging "Bind: A
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You may also receive this error if
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22.3.17 Handling/Debugging "LustreE
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22.3.22 Number of OSTs Needed for S
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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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