Lustre 1.6 Operations Manual

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28.5 Handling Timeouts Timeouts are the most common cause of hung applications. After a timeout involving an MDS or failover OST, applications attempting to access the disconnected resource wait until the connection gets established. When a client performs any remote operation, it gives the server a reasonable amount of time to respond. If a server does not reply either due to a down network, hung server, or any other reason, a timeout occurs which requires a recovery. If a timeout occurs, a message (similar to this one), appears on the console of the client, and in /var/log/messages: LustreError: 26597:(client.c:810:ptlrpc_expire_one_request()) @@@ timeout req@a2d45200 x5886/t0 o38->mds_svc_UUID@NID_mds_UUID:12 lens 168/64 ref 1 fl RPC:/0/0 rc 0 28-22 Lustre 1.6 Operations Manual • September 2008
CHAPTER 29 Lustre Programming Interfaces (man2) This chapter describes public programming interfaces to control various aspects of Lustre from userspace. These interfaces are generally not guaranteed to remain unchanged over time, although we will make an effort to notify the user community well in advance of major changes. This chapter includes the following section: ■ User/Group Cache Upcall 29.1 User/Group Cache Upcall This section describes user and group upcall. 29.1.1 Name Use /proc/fs/lustre/mds/mds-service/group_upcall to look up a given user’s group membership. 29-1
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Lustre 1.6 Operations Manual Sun M
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Please Recycle
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2. Understanding Lustre Networking
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6. Configuring Lustre - Examples 6-
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9. Configuring Quotas 9-1 9.1 Worki
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15. Backup and Restore 15-1 15.1 Lu
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20. LustreProc 20-1 20.1 /proc Entr
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22. Lustre Troubleshooting Tips 22-
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Part IV Lustre for Users 24. Free S
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29. Lustre Programming Interfaces (
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33. System Limits 33-1 33.1 Maximum
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Shell Prompts Shell C shell C shell
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xxiv Lustre 1.6 Operations Manual
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PART I Lustre Architecture Lustre i
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1.1 Lustre File System Lustre is a
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1.2.4 OSTs An OSTs provide back-end
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1.3 Files in the Lustre File System
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1.3.1 Lustre File System and Stripi
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1.3.3 Lustre System Capacity Lustre
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1.5 Lustre Networking In clusters w
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Note - Lustre does not provide redu
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Key features of LNET include: ■
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CHAPTER 3 Prerequisites This chapte
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3.2 Using a Pre-Packaged Lustre Rel
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Another option is to: 1. Install db
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3.3.4 Choosing a Proper Kernel I/O
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3.4 Memory Requirements This sectio
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CHAPTER 4 Lustre Installation This
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4.1.1 MountConf MountConf is shorth
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Note - For detailed information on
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Mounting Lustre on a client node $
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We are mounting by disk label here
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4.2.2.2 Mount with Inactive OSTs Mo
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Client mount for foo: mount -t lust
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$ mount -t lustre -L testfs-MDT0000
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$ cd /tmp/kernels/linux-2.6.9 $ rm
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Use standard RPM commands to instal
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4.3.2.2 Liblustre The Lustre librar
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4.4 Building a Lustre Source Tarbal
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CHAPTER 5 Configuring the Lustre Ne
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5.1.5 Determine Appropriate Mount P
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Note - Depending on the Linux distr
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live_router_check_interval, dead_ro
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5.2.3 Downed Routers There are two
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5.3.2 Stopping LNET Before the LNET
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CHAPTER 6 Configuring Lustre - Exam
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6.1.2 Lustre with Separate MGS and
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How to Create a CSV File Five diffe
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Linux LVM LV (Logical Volume) The C
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The lustre_config.csv file looks li
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Example 1: Simple Lustre configurat
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CHAPTER 7 More Complicated Configur
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Because megan and oscar match the f
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7.2 Elan to TCP Routing Servers meg
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7.3.3 Start clients For the TCP cli
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CHAPTER 8 Failover This chapter des
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For proper resource fencing, the He
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8.1.5 Roles of Nodes in a Failover
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8.4.3 Hardware Requirements for Fai
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8.5.1.1 Configuring Heartbeat This
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. Monitor the syslog on both nodes.
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To get the proper syntax, run: $ st
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8.6 Using MMP The multiple mount pr
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8.7.2 Configuring the Hardware Hear
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Use this procedure: 1. Create the b
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8.7.3.2 Testing 1. Pull power from
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CHAPTER 9 Configuring Quotas This c
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To enable quotas automatically when
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The lfs command now includes these
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This sets a much smaller granularit
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The quota_bunit_sz parameter displa
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9.1.5.2 Quota Limits Available quot
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Quota Event nowait_for_pending_blk_
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CHAPTER 10 RAID This chapter descri
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10.1.3 Understanding Double Failure
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10.2 Insights into Disk Performance
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OST Filesystem: RAID5 with 5 or 9 d
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10.2.1 Sample Graphs The graphs in
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10.2.1.2 Graphs for Read Performanc
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10.3 Creating an External Journal W
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CHAPTER 11 Kerberos This chapter de
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Note - The Heimdal implementation o
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General Installation Notes ■ ■
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. Install the keytab. Note - There
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# uppercase the hex nid=$(echo $nid
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11.2.2 Types of Lustre-Kerberos Fla
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11.2.2.3 Customized Flavor In most
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11.2.2.6 Rules, Syntax and Examples
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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
Page 351 and 352: CHAPTER 25 Striping and I/O Options
Page 353 and 354: 25.1.2 Disadvantages of Striping Th
Page 355 and 356: You can also use ls -l /proc//fd/ t
Page 357 and 358: 25.3.1 Changing Striping for a Subd
Page 359 and 360: 25.4.1 Round-Robin Allocator When O
Page 361 and 362: 25.6 Other I/O Options This section
Page 363 and 364: if (close(fd) < 0) { fprintf(stderr
Page 365 and 366: } /* Ping all OSTs that belong to t
Page 367 and 368: CHAPTER 26 Lustre Security This cha
Page 369 and 370: Lustre ACL support is a system-wide
Page 371 and 372: The root squash UID and GID can be
Page 373 and 374: CHAPTER 27 Lustre Operating Tips Th
Page 375 and 376: 27.2 A Simple Data Migration Script
Page 377 and 378: 27.4 Failures Running a Client and
Page 379: PART V Reference This part includes
Page 382 and 383: 28.1 lfs The lfs utility can be use
Page 384 and 385: Options The various lfs options are
Page 386 and 387: Option Description setstripe Create
Page 388 and 389: Option Description help Provides br
Page 390 and 391: $ lfs quotacheck -ug /mnt/lustre Ch
Page 392 and 393: Options The options and description
Page 394 and 395: Example e2fsck -n -v --mdsdb /tmp/m
Page 396 and 397: lustre-OST0000: ******* WARNING: Fi
Page 398 and 399: To fix dangling inodes, lfsck creat
Page 400 and 401: Options The options and description
Page 404 and 405: 29.1.2 Description The group upcall
Page 406 and 407: 29-4 Lustre 1.6 Operations Manual
Page 408 and 409: Description The llapi_file_create()
Page 410 and 411: 30.1.2 llapi_file_get_stripe Use ll
Page 412 and 413: 30.1.4 llapi_quotactl Use llapi_quo
Page 414 and 415: Return Values llapi_quotactl() retu
Page 416 and 417: Important: All old (pre v.1.4.6) Lu
Page 418 and 419: ip2nets ("") is a string that lists
Page 420 and 421: The expansion is a list enclosed in
Page 422 and 423: 31.2.2 SOCKLND Kernel TCP/IP LND Th
Page 424 and 425: 31.2.3 QSW LND The QSW LND (qswlnd)
Page 426 and 427: 31.2.5 VIB LND The VIB LND is conne
Page 428 and 429: 31.2.6 OpenIB LND The OpenIB LND is
Page 430 and 431: ME/MD Queue Length The ptllnd uses
Page 432 and 433: 31.2.8 Portals LND (Catamount) The
Page 434 and 435: 31.2.9 MX LND MXLND supports a numb
Page 436 and 437: 31-22 Lustre 1.6 Operations Manual
Page 438 and 439: 32.1 mkfs.lustre The mkfs.lustre ut
Page 440 and 441: Option Description --stripe-count-h
Page 442 and 443: Option Description --index=index Fo
Page 444 and 445: 32.3 lctl The lctl utility is used
Page 446 and 447: Device Operations Option Descriptio
Page 448 and 449: Options Use the following options t
Page 450 and 451: 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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