GPFS: Administration and Programming Reference - IRA Home

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The system displays information similar to: mmchconfig: Command successfully completed mmchconfig: 6027-1371 Propagating the changes to all affected nodes. This is an asynchronous process. See the “mmchconfig Command” on page 88 for complete usage information. Node quorum considerations For a discussion on node quorum, see General Parallel File System: Concepts, Planning, and Installation Guide and search on node quorum Node quorum with tiebreaker considerations For a discussion on node quorum with tiebreaker, see General Parallel File System: Concepts, Planning, and Installation Guide and search on node quorum with tiebreaker. When using node quorum with tiebreaker, define between one and three disks to be used as tiebreaker disks when any quorum node is down. Issue this command: mmchconfig tiebreakerDisks="nsdName;nsdName;nsdName" Consider these points: v You are not permitted to change a GPFS cluster configuration to use node quorum with tiebreaker if there are more than eight existing quorum nodes. v You may have a maximum of three tiebreaker disks. v The disks must have one of these types of attachments to the quorum nodes: – fibre-channel SAN – virtual shared disks v The GPFS daemons must be down on all nodes in the cluster when running mmchconfig tiebreakerDisks. If you are using node quorum with tiebreaker and want to change to using node quorum, issue this command: mmchconfig tiebreakerDisks=DEFAULT Displaying and changing the file system manager node In general, GPFS performs the same functions on all nodes. There are also cases where one node provides a more global function affecting the operation of multiple nodes. For example, each file system is assigned a node that functions as a file system manager. For a more detailed discussion on the role of the file system manager node, see General Parallel File System: Concepts, Planning, and Installation Guide and search on Special management functions. The node that is the file system manager can also be used for applications. In some cases involving very large clusters or applications that place a high stress on metadata operations, it may be useful to specify which nodes are used as file system managers. Applications that place a high stress on metadata operations are usually those which involve large numbers of very small files, or that do very fine grain parallel write sharing among multiple nodes. You can display the file system manager node by issuing the mmlsmgr command. You can display the information for an individual file system, a list of file systems, or for all of the file systems in the cluster. For example, to display the file system manager for the file system fs1, enter: mmlsmgr fs1 10 GPFS: Administration and Programming Reference
The output shows the device name of the file system and the file system manager’s node number and name. file system manager node [from 19.134.68.69 (k164n05)] ---------------- ------------------ fs1 19.134.68.70 (k164n06) See the “mmlsmgr Command” on page 212 for complete usage information. You can change the file system manager node for an individual file system by issuing the mmchmgr command. For example, to change the file system manager node for the file system fs1 to k145n32, enter: mmchmgr fs1 k145n32 The output shows the file system manager’s node number and name, in parenthesis, as recorded in the GPFS cluster data: GPFS: 6027-628 Sending migrate request to current manager node 19.134.68.69 (k145n30). GPFS: 6027-629 Node 19.134.68.69 (k145n30) resigned as manager for fs1. GPFS: 6027-630 Node 19.134.68.70 (k145n32) appointed as manager for fs1. See the “mmchmgr Command” on page 107 for complete usage information. Starting and stopping GPFS For new GPFS clusters, see Steps to establishing and starting your GPFS cluster in: General Parallel File System: Concepts, Planning, and Installation Guide. For existing GPFS clusters, before starting GPFS, ensure that you have: 1. Verified the installation of all prerequisite software. 2. Compiled the GPL layer, if Linux is being used. 3. Properly configured and tuned your system for use by GPFS. This should be done prior to starting GPFS. For details see the General Parallel File System: Concepts, Planning, and Installation Guide. Start the daemons on all of the nodes in the cluster by issuing the mmstartup -a command: mmstartup -a The output is similar to this: Tue Aug 24 15:54:56 edt 2004: 6027-1642 mmstartup: Starting GPFS ... Check the messages recorded in /var/adm/ras/mmfs.log.latest on one node for verification. Look for messages similar to this: mmfsd initializing ... GPFS: 6027-300 mmfsd ready This indicates that quorum has been formed and this node has successfully joined the cluster, and is now ready to mount file systems. If GPFS does not start, see the General Parallel File System: Concepts, Planning, and Installation Guide and search for the GPFS daemon will not come up. See the “mmstartup Command” on page 270 for complete usage information. Chapter 2. Managing your GPFS cluster 11
Page 1: General Parallel File System Admini
Page 4 and 5: Note: Before using this information
Page 6 and 7: Chapter 4. Managing disks . . . . .
Page 8 and 9: mmrestripefile Command . . . . . .
Page 10 and 11: viii GPFS: Administration and Progr
Page 12 and 13: x GPFS: Administration and Programm
Page 14 and 15: Table 1. Typographic conventions (c
Page 16 and 17: - The mmmount and mmumount commands
Page 18 and 19: - The local cluster no longer needs
Page 20 and 21: xviii GPFS: Administration and Prog
Page 22 and 23: 2 GPFS: Administration and Programm
Page 24 and 25: Remote shell command: /usr/bin/rsh
Page 26 and 27: v A node being deleted cannot be th
Page 28 and 29: You may be able to tune your cluste
Page 32 and 33: If it becomes necessary to stop GPF
Page 34 and 35: ecorded in the GPFS configuration f
Page 36 and 37: Checking and repairing a file syste
Page 38 and 39: -j scatter Block allocation type -D
Page 40 and 41: Restriping offers the opportunity t
Page 42 and 43: See the “mmdf Command” on page
Page 44 and 45: 2. The TSM client code must be inst
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Page 48 and 49: gpfs3nsd 0903C1573F2AD7B6 /dev/sdb1
Page 50 and 51: 12 % complete on Fri Feb 3 16:02:39
Page 52 and 53: suspended Indicates that data is to
Page 54 and 55: v You must identify the disks by th
Page 58 and 59: To disable quota management: 1. Iss
Page 60 and 61: During the normal operation of file
Page 62 and 63: The system displays output similar
Page 66 and 67: Each GPFS file or directory has an
Page 68 and 69: group::rwx- #effective:rw-- other::
Page 70 and 71: 2. A Directory ACL is similar to th
Page 72 and 73: This ACL shows four ACL entries (an
Page 74 and 75: general suggestion is for the compu
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Table 4. GPFS commands (continued)
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mmadddisk Command mmadddisk Command
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mmadddisk Command Note: Rebalancing
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mmaddnode Command Name mmaddnode Ad
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mmaddnode Command See also “mmchc
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mmapplypolicy Command how the mmapp
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mmapplypolicy Command MIGRATED /fs1
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mmauth Command delete Deletes a clu
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mmauth Command mmauth: Propagating
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mmbackup Command Name mmbackup - Ba
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mmbackup Command Tue Mar 18 14:03:2
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mmchattr Command -m MetadataReplica
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mmchcluster Command Name mmchcluste
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mmchcluster Command Security You mu
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mmchconfig Command Name mmchconfig
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mmchconfig Command dmapiMountTimeou
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mmchconfig Command and search for n
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mmchdisk Command Name mmchdisk - Ch
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mmchdisk Command resume Informs GPF
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mmcheckquota Command Name mmcheckqu
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mmcheckquota Command 55 % complete
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mmchfileset Command Examples This c
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mmchfs Command If your file system
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mmchfs Command When considering dat
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mmchmgr Command GPFS: 6027-628 Send
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mmchnsd Command Options NONE DiskNa
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mmchpolicy Command Name mmchpolicy
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mmcrcluster Command Name mmcrcluste
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mmcrcluster Command If your primary
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mmcrfileset Command Name mmcrfilese
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mmcrfs Command Name mmcrfs - Create
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mmcrfs Command Options other disk)
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mmcrfs Command -z {yes | no} Enable
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mmcrnsd Command Name mmcrnsd - Crea
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mmcrnsd Command Note: This name can
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mmcrnsd Command Location /usr/lpp/m
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mmcrsnapshot Command Options NONE I
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mmcrvsd Command Name mmcrvsd - Crea
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mmcrvsd Command Options dataOnly In
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mmcrvsd Command See also “mmcrnsd
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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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