Lustre 1.6 Operations Manual

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For example, one OST per tier LUNLabel Owner Status Capacity Block Tiers Tier list (Mbytes) Size ------------------------------------------------------------------- 0 1 Ready 102400 512 1 1 1 1 Ready 102400 512 1 2 2 1 Ready 102400 512 1 3 3 1 Ready 102400 512 1 4 4 2 Ready [GHS] 102400 4096 1 5 5 2 Ready [GHS] 102400 4096 1 6 6 2 Critical 102400 512 1 7 7 2 Critical 102400 4096 1 8 10 1 Cache Locked 64 512 1 1 11 1 Ready 64 512 1 2 12 1 Cache Locked 64 512 1 3 13 1 Cache Locked 64 512 1 4 14 2 Ready [GHS] 64 512 1 5 15 2 Ready [GHS] 64 512 1 6 16 2 Ready [GHS] 64 4096 1 7 17 2 Ready [GHS] 64 4096 1 8 System verify extent: 16 Mbytes System verify delay: 30 21.6 Large-Scale Tuning for Cray XT and Equivalents This section only applies to Cray XT3 Catamount nodes, and explains parameters used with the kptllnd module. If it does not apply to your setup, ignore it. 21-10 Lustre 1.6 Operations Manual • September 2008
21.6.1 Network Tunables With a large number of clients and servers possible on these systems, tuning various request pools becomes important. We are making changes to the ptllnd module. Parameter max_nodes max_procs_per_node Description max_nodes is the maximum number of queue pairs, and, therefore, the maximum number of peers with which the LND instance can communicate. Set max_nodes to a value higher than the product of the total number of nodes and maximum processes per node. Max nodes > (Total # Nodes) * (max_procs_per_node) Setting max_nodes to a lower value than described causes Lustre to throw an error. Setting max_nodes to a higher value, causes excess memory to be consumed. max_procs_per_node is the maximum number of cores (CPUs), on a single Catamount node. Portals must know this value to properly clean up various queues. LNET is not notified directly when a Catamount process aborts. The first information LNET receives is when a new Catamount process with the same Cray portals NID starts and sends a connection request. If the number of processes with that Cray portals NID exceeds the max_procs_per_node value, then LNET removes the oldest one to make space for the new one. These two tunables combine to set the size of the ptllnd request buffer pool. The buffer pool must never drop an incoming message, so proper sizing is very important. Ntx Credits Ntx helps to size the transmit (tx) descriptor pool. A tx descriptor is used for each send and each passive RDMA. The max number of concurrent sends == 'credits'. Passive RDMA is a response to a PUT or GET of a payload that is too big to fit in a small message buffer. For servers, this only happens on large RPCs (for instance, where a long file name is included), so the MDS could be under pressure in a large cluster. For routers, this is bounded by the number of servers. If the tx pool is exhausted, a console error message appears. Credits determine how many sends are in-flight at once on ptllnd. Optimally, there are 8 requests in-flight per server. The default value is 128, which should be adequate for most applications. Chapter 21 Lustre Tuning 21-11
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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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Page 260 and 261: 19.4.3.2 Group This section lists l
Page 262 and 263: del_group NAME Removes a group from
Page 264 and 265: There are only two test types: --pi
Page 266 and 267: 19.4.3.4 Other Commands This sectio
Page 268 and 269: show_error [--session] [GROUP]|[IDs
Page 270 and 271: 20.1 /proc Entries for Lustre This
Page 272 and 273: proc/sys/lustre/fail_loc This is th
Page 274 and 275: 20.1.3.1 Configuring Adaptive Timeo
Page 276 and 277: Note - Changing adaptive timeouts s
Page 278 and 279: Credits work like a semaphore. At s
Page 280 and 281: 20.2 Lustre I/O Tunables The sectio
Page 282 and 283: 20.2.2 Watching the Client RPC Stre
Page 284 and 285: 20.2.4 Client Read-Write Extents Su
Page 286 and 287: 20.2.5 Watching the OST Block I/O S
Page 288 and 289: 20.2.7 mballoc History /proc/fs/ldi
Page 290 and 291: Number of groups scanned (grps colu
Page 292 and 293: 20.2.9 Locking /proc/fs/lustre/ldlm
Page 294 and 295: 20.3.1 RPC Information for Other OB
Page 296 and 297: Where: Parameter Cur. Count Cur. Ra
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Page 300 and 301: 21.1.0.1 OSS Service Thread Count T
Page 302 and 303: 21.3 Options to Format MDT and OST
Page 304 and 305: 21.3.3.3 Number of Inodes for OST F
Page 306 and 307: 21.5.3 Setting Write-Back Cache Per
Page 310 and 311: 21.7 Lockless I/O Tunables The lock
Page 312 and 313: 22.1.2 Lustre Logs The error messag
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Page 316 and 317: 22.3.4 OSTs Become Read-Only If the
Page 318 and 319: 22.3.6 Changing Parameters You can
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Page 322 and 323: 22.3.12 Handling/Debugging "Bind: A
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Page 326 and 327: 22.3.17 Handling/Debugging "LustreE
Page 328 and 329: 22.3.22 Number of OSTs Needed for S
Page 330 and 331: 23.1 Lustre Debug Messages Each Lus
Page 332 and 333: 23.2 Tools for Lustre Debugging The
Page 334 and 335: debug_daemon stop Completely shuts
Page 336 and 337: 4. If you already have a debug log
Page 338 and 339: 23.2.8 Adding Debugging to the Lust
Page 340 and 341: 23.3 Troubleshooting with strace Th
Page 342 and 343: 23.4.1 Determine the Lustre UUID of
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Page 347 and 348: CHAPTER 24 Free Space and Quotas Th
Page 349 and 350: 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
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Page 357 and 358: 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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29-4 Lustre 1.6 Operations Manual
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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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