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mmchconfig Command and search for node quorum with tiebreaker. To enable this feature, specify the names of one or three disks. Separate the NSD names with semicolon (;) and enclose the list in quotes. The disks do not have to belong to any particular file system, but must be directly accessible from the quorum nodes. For example: tiebreakerDisks="gpfs1nsd;gpfs2nsd;gpfs3nsd" To disable this feature, use: tiebreakerDisks=no When changing the tiebreakerDisks, GPFS must be down on all nodes in the cluster. uidDomain Specifies the UID domain name for the cluster. A detailed description of the GPFS user ID remapping convention is contained in UID Mapping for GPFS in a Multi-Cluster Environment at www.ibm.com/servers/eserver/clusters/library/wp_aix_lit.html. unmountOnDiskFail Controls how the GPFS daemon will respond when a disk failure is detected. Valid values are yes or no. When unmountOnDiskFail is set to no, the daemon marks the disk as failed and continues as long as it can without using the disk. All nodes that are using this disk are notified of the disk failure. The disk can be made active again by using the mmchdisk command. This is the suggested setting when metadata and data replication are used because the replica can be used until the disk is brought online again. When unmountOnDiskFail is set to yes, any disk failure will cause only the local node to force-unmount the file system that contains that disk. Other file systems on this node and other nodes continue to function normally, if they can. The local node can try and remount the file system when the disk problem has been resolved. This is the suggested setting when using SAN-attached disks in large multinode configurations, and when replication is not being used. This setting should also be used on a node that hosts descOnly disks. See Establishing disaster recovery for your GPFS cluster in General Parallel File System: Advanced Administration Guide. worker1Threads Controls the maximum number of concurrent file operations at any one instant. If there are more requests than that, the excess will wait until a previous request has finished. The primary use is for random read or write requests that cannot be pre-fetched, random I/O requests, or small file activity. The minimum value is 1. The maximum value is 64. The default value is 48. The maximum value of prefetchThreads plus worker1Threads is: v On 32-bit kernels, 164 v On 64-bit kernels, 550 -I Specifies that the changes take effect immediately but do not persist when GPFS is restarted. This option is valid only for the dataStructureDump, dmapiEventTimeout, dmapiSessionFailureTimeout, dmapiMountTimeoout, maxMBpS, unmountOnDiskFail, and pagepool attributes. -i Specifies that the changes take effect immediately and are permanent. This option is valid only for the dataStructureDump, dmapiEventTimeout, dmapiSessionFailureTimeout, dmapiMountTimeoout, maxMBpS, unmountOnDiskFail, and pagepool attributes. Exit status 0 Successful completion. nonzero A failure has occurred. 92 GPFS: Administration and Programming Reference
Security You must have root authority to run the mmchconfig command. You may issue the mmchconfig command from any node in the GPFS cluster. When using the rcp and rsh commands for remote communication, a properly configured .rhosts file must exist in the root user’s home directory on each node in the GPFS cluster. If you have designated the use of a different remote communication program on either the mmcrcluster or the mmchcluster command, you must ensure: 1. Proper authorization is granted to all nodes in the GPFS cluster. 2. The nodes in the GPFS cluster can communicate without the use of a password, and without any extraneous messages. Examples To change the maximum file system block size allowed to 512 KB, issue this command: mmchconfig maxblocksize=512K To confirm the change, issue this command: mmlsconfig The system displays information similar to: Configuration data for cluster cluster.kgn.ibm.com: ----------------------------------------------------------- clusterName cluster.kgn.ibm.com clusterId 680681562216850737 clusterType lc multinode yes autoload no useDiskLease yes maxFeatureLevelAllowed 901 maxblocksize 512K File systems in cluster cluster.kgn.ibm.com: ---------------------------------------------------- /dev/fs1 See also “mmaddnode Command” on page 66 “mmcrcluster Command” on page 114 “mmdelnode Command” on page 159 “mmlsconfig Command” on page 200 “mmlscluster Command” on page 198 Location /usr/lpp/mmfs/bin mmchconfig Command Chapter 8. GPFS commands 93
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General Parallel File System Admini
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Note: Before using this information
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Chapter 4. Managing disks . . . . .
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mmrestripefile Command . . . . . .
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viii GPFS: Administration and Progr
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x GPFS: Administration and Programm
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Table 1. Typographic conventions (c
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- The mmmount and mmumount commands
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- The local cluster no longer needs
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xviii GPFS: Administration and Prog
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2 GPFS: Administration and Programm
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Remote shell command: /usr/bin/rsh
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v A node being deleted cannot be th
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You may be able to tune your cluste
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The system displays information sim
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If it becomes necessary to stop GPF
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ecorded in the GPFS configuration f
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Checking and repairing a file syste
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-j scatter Block allocation type -D
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Restriping offers the opportunity t
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See the “mmdf Command” on page
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2. The TSM client code must be inst
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26 GPFS: Administration and Program
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gpfs3nsd 0903C1573F2AD7B6 /dev/sdb1
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12 % complete on Fri Feb 3 16:02:39
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suspended Indicates that data is to
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v You must identify the disks by th
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36 GPFS: Administration and Program
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To disable quota management: 1. Iss
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During the normal operation of file
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Page 66 and 67: Each GPFS file or directory has an
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Page 80 and 81: Table 4. GPFS commands (continued)
Page 82 and 83: mmadddisk Command mmadddisk Command
Page 84 and 85: mmadddisk Command Note: Rebalancing
Page 86 and 87: mmaddnode Command Name mmaddnode Ad
Page 88 and 89: mmaddnode Command See also “mmchc
Page 90 and 91: mmapplypolicy Command how the mmapp
Page 92 and 93: mmapplypolicy Command MIGRATED /fs1
Page 94 and 95: mmauth Command delete Deletes a clu
Page 96 and 97: mmauth Command mmauth: Propagating
Page 98 and 99: mmbackup Command Name mmbackup - Ba
Page 100 and 101: mmbackup Command Tue Mar 18 14:03:2
Page 102 and 103: mmchattr Command -m MetadataReplica
Page 104 and 105: mmchcluster Command Name mmchcluste
Page 106 and 107: mmchcluster Command Security You mu
Page 108 and 109: mmchconfig Command Name mmchconfig
Page 110 and 111: mmchconfig Command dmapiMountTimeou
Page 114 and 115: mmchdisk Command Name mmchdisk - Ch
Page 116 and 117: mmchdisk Command resume Informs GPF
Page 118 and 119: mmcheckquota Command Name mmcheckqu
Page 120 and 121: mmcheckquota Command 55 % complete
Page 122 and 123: mmchfileset Command Examples This c
Page 124 and 125: mmchfs Command If your file system
Page 126 and 127: mmchfs Command When considering dat
Page 128 and 129: mmchmgr Command GPFS: 6027-628 Send
Page 130 and 131: mmchnsd Command Options NONE DiskNa
Page 132 and 133: mmchpolicy Command Name mmchpolicy
Page 134 and 135: mmcrcluster Command Name mmcrcluste
Page 136 and 137: mmcrcluster Command If your primary
Page 138 and 139: mmcrfileset Command Name mmcrfilese
Page 140 and 141: mmcrfs Command Name mmcrfs - Create
Page 142 and 143: mmcrfs Command Options other disk)
Page 144 and 145: mmcrfs Command -z {yes | no} Enable
Page 146 and 147: mmcrnsd Command Name mmcrnsd - Crea
Page 148 and 149: mmcrnsd Command Note: This name can
Page 150 and 151: mmcrnsd Command Location /usr/lpp/m
Page 152 and 153: mmcrsnapshot Command Options NONE I
Page 154 and 155: mmcrvsd Command Name mmcrvsd - Crea
Page 156 and 157: mmcrvsd Command Options dataOnly In
Page 158 and 159: mmcrvsd Command See also “mmcrnsd
Page 160 and 161: mmdefedquota Command -u Specifies t
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mmdefquotaoff Command mmlsquota -d
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mmdefquotaon Command Security You m
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mmdefragfs Command Name mmdefragfs
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mmdefragfs Command gpfs60nsd 50688
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mmdelacl Command “mmputacl Comman
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mmdeldisk Command -F DescFile A fil
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mmdelfileset Command Name mmdelfile
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mmdelfileset Command 88 % complete
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mmdelfs Command Examples To delete
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mmdelnode Command Exit status 0 Suc
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mmdelnsd Command Options NONE Exit
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mmdelsnapshot Command When using th
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mmdf Command Exit status 0 Successf
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mmeditacl Command Name mmeditacl -
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mmeditacl Command Exit status 0 Suc
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mmedquota Command Group Name or gro
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mmexportfs Command Name mmexportfs
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mmfsck Command Name mmfsck - Checks
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mmfsck Command -n Specifies a no re
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mmfsck Command See also “mmcheckq
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mmfsctl Command v Modifications to
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mmfsctl Command lunA2 FlashCopy tar
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mmgetacl Command Parameters Filenam
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mmgetstate Command Name The mmgetst
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mmgetstate Command See also “mmch
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mmimportfs Command Parameters Devic
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mmlinkfileset Command Name mmlinkfi
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mmlsattr Command Name mmlsattr - Qu
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mmlscluster Command Name mmlscluste
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mmlsconfig Command Name mmlsconfig
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mmlsdisk Command Name mmlsdisk - Di
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mmlsdisk Command disk driver sector
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mmlsfileset Command Name mmlsfilese
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mmlsfileset Command 3. These comman
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mmlsfs Command -o Additional mount
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mmlsmgr Command Name mmlsmgr - Disp
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mmlsmount Command Name mmlsmount -
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mmlsnsd Command Name mmlsnsd - Disp
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mmlsnsd Command gpfs1 gpfs1nsd 0972
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mmlspolicy Command mmlspolicy fs2 -
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mmlsquota Command When a quota mana
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mmlssnapshot Command Name mmlssnaps
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mmmount Command Name mmmount - Moun
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mmpmon Command Name mmpmon - Manage
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mmpmon Command Use of the -i flag i
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mmpmon Command bytes written: 13946
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mmputacl Command Options -d Specifi
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mmquotaoff Command Name mmquotaoff
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mmquotaon Command Name mmquotaon -
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mmremotecluster Command Name mmremo
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mmremotecluster Command 2. This com
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mmremotefs Command Options -A {yes
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mmrepquota Command Name mmrepquota
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mmrepquota Command *** Report for U
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mmrestorefs Command Exit status 0 S
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mmrestripefile Command Name mmrestr
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mmrestripefile Command See also “
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mmrestripefs Command Assuming that
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mmrestripefs Command See also “mm
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mmrpldisk Command The disk descript
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mmrpldisk Command See also “mmadd
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mmsanrepairfs Command Repairing hyp
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mmshutdown Command When using the r
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mmsnapdir Command nonzero A failure
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mmstartup Command Name mmstartup -
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mmumount Command Name mmumount - Un
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mmunlinkfileset Command Name mmunli
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mmunlinkfileset Command See also
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Table 9. GPFS programming interface
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gpfs_close_inodescan() Subroutine N
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gpfs_cmp_fssnapid() Subroutine Loca
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gpfs_fcntl() Subroutine Name gpfs_f
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gpfs_fcntl() Subroutine fcntlArg.po
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gpfs_fputattrs() Subroutine Name gp
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gpfs_free_fssnaphandle() Subroutine
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gpfs_fssnap_id_t Structure Name gpf
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gpfs_get_fsname_from_fssnaphandle()
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gpfs_get_fssnaphandle_by_name() Sub
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gpfs_get_fssnaphandle_by_path() Sub
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gpfs_get_fssnapid_from_fssnaphandle
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gpfs_get_snapdirname() Subroutine N
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gpfs_get_snapname_from_fssnaphandle
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gpfs_getacl() Subroutine Error stat
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gpfs_iattr_t Structure /* don’t r
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gpfs_ifile_t Structure Name gpfs_if
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gpfs_igetattrs() Subroutine GPFS_E_
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gpfs_igetfilesetname() Subroutine E
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gpfs_igetstoragepool() Subroutine E
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gpfs_iopen() Subroutine Exceptions
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gpfs_iread() Subroutine EPERM The c
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gpfs_ireaddir() Subroutine Examples
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gpfs_ireadlink() Subroutine Locatio
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gpfs_ireadx() Subroutine offset On
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gpfs_next_inode() Subroutine Name g
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gpfs_opaque_acl_t Structure Name gp
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gpfs_open_inodescan() Subroutine No
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gpfs_prealloc() Subroutine Exceptio
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gpfs_putacl() Subroutine Exceptions
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gpfs_quotactl() Subroutine Q_SETQUO
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gpfs_quotaInfo_t Structure Name gpf
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gpfs_seek_inode() Subroutine Locati
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gpfsAccessRange_t Structure Name gp
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gpfsClearFileCache_t Structure Name
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gpfsDataShipMap_t Structure partiti
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gpfsDataShipStart_t Structure flag
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gpfsDataShipStop_t Structure Name g
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gpfsFreeRange_t Structure Name gpfs
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gpfsGetReplication_t Structure Name
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gpfsGetSnapshotName_t Structure Nam
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gpfsMultipleAccessRange_t Structure
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gpfsRestripeData_t Structure Name g
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gpfsSetReplication_t Structure rese
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366 GPFS: Administration and Progra
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mmsdrbackup User exit mmsdrbackup U
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syncfsconfig User exit Name syncfsc
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GPFS exceptions and limitations to
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2455 South Road, Poughkeepsie, NY 1
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metadataOnly Indicates that the dis
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v manager | client - Indicates whet
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v For AIX nodes, see Installing the
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RPM at www.rpm.org/ The Internet En
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commands (continued) mmchfileset 10
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file systems (continued) creating 1
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mmchattr 19, 81 mmchcluster 6, 84 m
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setting access control lists 46 sna
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