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syncfsconfig User exit Name syncfsconfig – Keeps file system configuration data in replicated clusters synchronized. Description The /var/mmfs/etc/syncfsconfig user exit, when properly installed, will be synchronously invoked after each command that may change the configuration of a file system. Examples of such commands are: mmadddisk, mmdeldisk, mmchfs, and so forth. The syncfsconfig user exit can be used to keep the file system configuration data in replicated GPFS clusters automatically synchronized. Read the sample file /usr/lpp/mmfs/samplessyncfsconfig.sample for a detailed description on how to code and install this user exit. Parameters None. Exit status The syncfsconfig user exit should always returns a value of zero. Location /var/mmfs/etc 370 GPFS: Administration and Programming Reference
Appendix A. Considerations for GPFS applications Application design should take into consideration: v “Exceptions to Open Group technical standards” v “Determining if a file system is controlled by GPFS” v “GPFS exceptions and limitations to NFS V4 ACLs” on page 372 Exceptions to Open Group technical standards GPFS is designed so that most applications written to The Open Group technical standard for file system calls can access GPFS data with no modification, however, there are some exceptions. Applications that depend on exact reporting of changes to the following fields returned by the stat() call may not work as expected: 1. exact mtime 2. mtime 3. ctime 4. atime Providing exact support for these fields would require significant performance degradation to all applications executing on the system. These fields are guaranteed accurate when the file is closed. These values will be accurate on a node right after it accesses or modifies a file, but may not be accurate for a short while when a file is accessed or modified on some other node. If ’exact mtime’ is specified for a file system (using the mmcrfs or mmchfs commands with the -E yes flag), the mtime and ctime values are always correct by the time the stat() call gives its answer. If ’exact mtime’ is not specified, these values will be accurate after a couple of minutes, to allow the synchronization daemons to propagate the values to all nodes. Regardless of whether ’exact mtime’ is specified, the atime value will be accurate after a couple of minutes, to allow for all the synchronization daemons to propagate changes. Alternatively, you may use the GPFS calls, gpfs_stat() and gpfs_fstat() to return exact mtime and atime values. The delayed update of the information returned by the stat() call also impacts system commands which display disk usage, such as du or df. The data reported by such commands may not reflect changes that have occurred since the last sync of the file system. For a parallel file system, a sync does not occur until all nodes have individually synchronized their data. On a system with no activity, the correct values will be displayed after the sync daemon has run on all nodes. Determining if a file system is controlled by GPFS A file system is controlled by GPFS if the f_type field in the statfs structure returned from a statfs() or fstatfs() call has the value 0x47504653, which is the ASCII characters ’GPFS’. This constant is in the gpfs.h file, with the name GPFS_SUPER_MAGIC. If an application includes gpfs.h, it can compare f_type to GPFS_SUPER_MAGIC to determine if the file system is controlled by GPFS. © Copyright IBM Corp. 1998, 2006 371
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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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To disable quota management: 1. Iss
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During the normal operation of file
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The system displays output similar
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Each GPFS file or directory has an
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group::rwx- #effective:rw-- other::
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2. A Directory ACL is similar to th
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This ACL shows four ACL entries (an
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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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Page 342 and 343: gpfs_ireaddir() Subroutine Examples
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Page 348 and 349: gpfs_next_inode() Subroutine Name g
Page 350 and 351: gpfs_opaque_acl_t Structure Name gp
Page 352 and 353: gpfs_open_inodescan() Subroutine No
Page 354 and 355: gpfs_prealloc() Subroutine Exceptio
Page 356 and 357: gpfs_putacl() Subroutine Exceptions
Page 358 and 359: gpfs_quotactl() Subroutine Q_SETQUO
Page 360 and 361: gpfs_quotaInfo_t Structure Name gpf
Page 362 and 363: gpfs_seek_inode() Subroutine Locati
Page 364 and 365: gpfsAccessRange_t Structure Name gp
Page 366 and 367: gpfsClearFileCache_t Structure Name
Page 368 and 369: gpfsDataShipMap_t Structure partiti
Page 370 and 371: gpfsDataShipStart_t Structure flag
Page 372 and 373: gpfsDataShipStop_t Structure Name g
Page 374 and 375: gpfsFreeRange_t Structure Name gpfs
Page 376 and 377: gpfsGetReplication_t Structure Name
Page 378 and 379: gpfsGetSnapshotName_t Structure Nam
Page 380 and 381: gpfsMultipleAccessRange_t Structure
Page 382 and 383: gpfsRestripeData_t Structure Name g
Page 384 and 385: gpfsSetReplication_t Structure rese
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Page 388 and 389: mmsdrbackup User exit mmsdrbackup U
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Page 396 and 397: 2455 South Road, Poughkeepsie, NY 1
Page 400 and 401: metadataOnly Indicates that the dis
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Page 406 and 407: v For AIX nodes, see Installing the
Page 408 and 409: RPM at www.rpm.org/ The Internet En
Page 410 and 411: commands (continued) mmchfileset 10
Page 412 and 413: file systems (continued) creating 1
Page 414 and 415: mmchattr 19, 81 mmchcluster 6, 84 m
Page 416 and 417: setting access control lists 46 sna
Page 420: Readers’ Comments — We’d Like
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