A sample file system creation

To create a file system called gpfs2 with the following properties:

• The disks for the file system that are listed in the file /tmp/gpfs2dsk
• Automatically mount the file system when the GPFS daemon starts (-A yes)
• Use a block size of 256 KB (-B 256K)
• Expect to mount it on 32 nodes (-n 32)
• Set both the default metadata replication and the maximum metadata replication to two (-m 2 -M 2)
• Set the default data replication to one and the maximum data replication to two (-r 1 -R 2)
• Use a default mount point of /gpfs2 (-T /gpfs2)

Enter:

mmcrfs /dev/gpfs2 -F /tmp/gpfs2dsk -A yes -B 256K -n 32 -m 2 -M 2 -r 1 -R 2 -T /gpfs2

The system displays information similar to:

The following disks of gpfs2 will be formatted on node k194p03.tes.nnn.com:
    hd25n09: size 17796014 KB
    hd24n09: size 17796014 KB
    hd23n09: size 17796014 KB
Formatting file system ...
Disks up to size 59 GB can be added to storage pool system.
Creating Inode File
  56 % complete on Mon Mar  3 15:10:08 2014
 100 % complete on Mon Mar  3 15:10:11 2014
Creating Allocation Maps
Clearing Inode Allocation Map
Clearing Block Allocation Map
  44 % complete on Mon Mar  3 15:11:32 2014
  90 % complete on Mon Mar  3 15:11:37 2014
 100 % complete on Mon Mar  3 15:11:38 2014
Completed creation of file system /dev/gpfs2.
mmcrfs: Propagating the cluster configuration data to all
  affected nodes.  This is an asynchronous process.

To confirm the file system configuration, issue the command:

mmlsfs gpfs2

The system displays information similar to:

flag                value                    description
------------------- ------------------------ -----------------------------------
 -f                 262144                   Minimum fragment (subblock) size in bytes
 -i                 512                      Inode size in bytes
 -I                 32768                    Indirect block size in bytes
 -m                 2                        Default number of metadata replicas
 -M                 2                        Maximum number of metadata replicas
 -r                 1                        Default number of data replicas
 -R                 2                        Maximum number of data replicas
 -j                 scatter                  Block allocation type
 -D                 nfs4                     File locking semantics in effect
 -k                 all                      ACL semantics in effect
 -n                 32                       Estimated number of nodes that will mount file system
 -B                 262144                   Block size
 -Q                 none                     Quotas accounting enabled
                    none                     Quotas enforced
                    none                     Default quotas enabled
 --perfileset-quota yes                      Per-fileset quota enforcement
 --filesetdf        yes                      Fileset df enabled?
 -V                 15.01 (4.2.0.0)          File system version
 --create-time      Wed Jan 18 17:22:25 2017 File system creation time
 -z                 no                       Is DMAPI enabled?
 -L                 262144                   Logfile size
 -E                 yes                      Exact mtime mount option
 -S                 yes                      Suppress atime mount option
 -K                 whenpossible             Strict replica allocation option
 --fastea           yes                      Fast external attributes enabled?
 --encryption       no                       Encryption enabled?
 --inode-limit      2015232                  Maximum number of inodes
 --log-replicas     0                        Number of log replicas (max 2)
 --is4KAligned      yes                      is4KAligned?
 --rapid-repair     yes                      rapidRepair enabled?
 --write-cache-threshold 65536               HAWC Threshold (max 65536)
 -P                 system                   Disk storage pools in file system
 -d                 gpfs1001nsd;gpfs1002nsd  Disks in file system
 -A                 yes                      Automatic mount option
 -o                 none                     Additional mount options
 -T                 /gpfs2                   Default mount point
 --mount-priority   0                        Mount priority