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v You must identify the disks by the NSD names that were given to them by the mmcrnsd command. v You must explicitly specify values for both the primary and backup NSD server nodes even if you are only changing one of them. v The file system that contains the NSD being changed must be unmounted prior to issuing the mmchnsd command. v The NSD must be properly connected to the new nodes prior to issuing the mmchnsd command. v This command cannot be used to change the DiskUsage or FailureGroup for an NSD. You must issue the mmchdisk command to change these. v You cannot change the name of the NSD. For example, to assign node k145n07 as a backup NSD server for disk gpfs47nsd: 1. Since you must always specify the primary, first issue the mmlsnsd command to ensure you are not inadvertently changing the primary server. mmlsnsd -d "gpfs47nsd" The system displays information similar to: File system Disk name Primary node Backup node --------------------------------------------------------------- fs1 gpfs47nsd k145n06 2. Unmount the file system on all nodes and ensure that the disk is connected to the new node k145n07. 3. Next issue the mmchnsd command: mmchnsd "gpfs47nsd:k145n06:k145n07" 4. Verify the changes by issuing the mmlsnsd command: mmlsnsd -d "gpfs47nsd" The system displays information similar to: File system Disk name Primary node Backup node --------------------------------------------------------------- fs1 gpfs47nsd k145n06 k145n07 Changing NSD server usage and failback GPFS determines if a node has physical or virtual connectivity to an underlying NSD disk through a sequence of commands invoked from the GPFS daemon. This determination is called disk discovery and occurs at both initial GPFS startup as well as whenever a file system is mounted. The default order of access used in disk discovery: 1. Local /dev block device interfaces for virtual shared disk, SAN, SCSI or IDE disks 2. NSD servers The useNSDserver file system mount option can be used to set the order of access used in disk discovery, and limit or eliminate switching from local access to NSD server access, or the other way around. This option is specified using the -o flag of the mmmount, mount, mmchfs, and mmremotefs commands, and has one of these values: always Always access the disk using the NSD server. asfound Access the disk as found (the first time the disk was accessed). No change of disk access from local to NSD server, or the other way around, is performed by GPFS. asneeded Access the disk any way possible. This is the default. never Always use local disk access. For example, to always use the NSD server when mounting file system fs1, issue this command: 34 GPFS: Administration and Programming Reference
mmmount fs1 -o useNSDserver=always To change the disk discovery of a file system that is already mounted: cleanly unmount it, wait for the unmount to complete, and then mount the file system using the desired -o useNSDserver option. Chapter 4. Managing disks 35
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 30 and 31: The system displays information sim
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
Page 46 and 47: 26 GPFS: Administration and Program
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 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
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
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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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