Create Volume Group Wizard: Configure file systems

Use this page to create and configure one or more file systems that you want to include in the volume group.

Each file system that you create must have a corresponding logical volume. If you create and configure a file system, but do not create and configure a logical volume, the wizard creates a logical volume for you. The wizard sets the properties for the logical volume that best accommodate the file system configuration options that you specify.

Fields

File system type
Select the type of file system that you want to create:
Standard
Select this type to create a file system that is compatible with the AIX® Version 3 file system. If you select this type you must accept the default values for the Fragment size, Number of bytes per i-node (NBPI), and Allocation group size properties. Additionally, the file system size must remain less than 2 GB.
Compressed
Select this type to create a file system in which all data is compressed automatically. The file system uses Lempel-Ziv (LZ) compression before data is written to the disk and all data is uncompressed automatically when read from the disk.
Large file enabled
Select this type to create a file system in which the maximum file size is increased from 2 GB to 64 GB minus 124 MB.
Enhanced
start of changeSelect this type to create a file system that uses database journaling techniques to keep its structure consistent. If the system stops abnormally, these techniques help to prevent damage to the file system. The enhanced journaled file system (JFS) supports both 32-bit and 64-bit file system semantics. It supports four PB (petabyte) file systems and dynamically allocates i-nodes so that disk space is not wasted on unused i-nodes. An i-node is the internal structure that describes the individual files on AIX, UNIX, or Linux systems. An i-node contains the information about files, not file content.
Note: If you select a logical volume name for a logical volume that has a type of journaled file system 2 (JFS2), this value is the default type for the associated file system. You cannot change this default value. If you select a logical volume name for a logical volume that has a type of JFS, you cannot select this value as the file system type.
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Logical volume name
Select or specify a name for the logical volume to which to add this file system. You can select the name of any logical volume that you created on the Logical volumes page. The logical volume that you select must be compatible with the File system type property that you select.

If you specify a new name, the wizard creates a logical volume with this name for you. If you do not enter a value, the wizard also creates a logical volume for you. The wizard sets the properties for the logical volume that best accommodate the file system configuration options that you specify.

You must specify a name that is unique to the cluster. The name must consist of 1 - 32 characters. You can use alphabetic characters of A - Z and a - z, numbers of 0 - 9, and the underscore (_) character. Also, the name cannot begin with a number.
Note: If this logical volume is part of a mirroring configuration across sites with Logical Volume Manager (LVM) mirroring configuration, include the site name as part of the logical volume name. For example, use a name such as LV1site1.
Size of file system
The combined values that you specify for the following properties determine the total size of the new file system.
Number of units
The total number of units of the Unit size property that you select.
Unit size
The size for each individual unit that you want to use for the new file system. You can select a unit size of megabytes, gigabytes, or 512 bytes.
Mount point
Specify the full directory path of the mount point, which is the location from which the file system is to be available for use.
Mount options
Select one of the following security options for the mount point of the file system:
nosuid
Selecting this value prevents Set User ID Upon Execution (setuid) and Set Group ID Upon Execution (setgid) programs from being run from the file system mount point.
nodev
start of changeSelecting this value prevents open system calls of devices from being run on the file system mount point. This option also prevents a user from accessing server devices by using a device-specific file on a client.end of change
Permissions
Select the type of access permission for the file system:
Read/Write
start of changeSelect this value to allow applications to read from and write to the file system. This option is the default value.end of change
Read only
start of changeSelect this value to allow applications to read data only from the file system.end of change
Start disk accounting
start of changeSelect whether to enable disk accounting on the file system. This option is not available for the enhanced file system type.
No
Select this value to disable disk accounting for the file system. This option is the default value.
Yes
start of changeSelect this value to use disk accounting to capture usage data for the file system.end of change
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Fragment size (Bytes)
start of changeSelect the fragment size, in bytes, of the file system. This property is not available for the enhanced or large file enabled options for the File system type property. You can set the fragment size to 512, 1024, 2048, or 4096 bytes. Selecting a fragment size that is less than a full block (4096 bytes) enables the file system to store partial blocks more efficiently. As a result, the file system uses only as many fragments as are required to hold the data. For example, partial blocks might be allocated at the end of a file.

If a file system is compressed, you can select a fragment size of 512, 1024, or 2048 bytes only. The default value for compressed option for the File system type property is 512 bytes. The default value for standard option for the File system type property is 4096 bytes.

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Block size
start of changeSelect the block size, in bytes, to use for the file system. This property is available only for the enhanced option for the File system type property. You can set the block size to 512, 1024, 2048, or 4096 bytes. The default value is 4096 bytes. Selecting a smaller block size sets the file system to use less disk space for small files, but doing so can result in additional operational usage. Because disk space is allocated in smaller units for a file system that has a block size other than 4096 bytes, allocation activity can occur more often when files or directories are repeatedly extended in size. This extra allocation activity might adversely affect performance. end of change
start of changeNumber of bytes per i-nodeend of change
start of changeSelect a value to use for the file system size, in bytes. The number that you select for this property is used with the number that you select for the Allocation group size property as a ratio that determines the number of i-nodes. Increasing the number of bytes per i-node (NBPI) decreases the total number of i-nodes in a file system. The total number of i-nodes in a file system limits the total number of files and the total size of the file system. The allowable NBPI values varies according to the number you select for theAllocation group size property.

The allowable NBPI values varies according to the Allocation group size property that you select. If you select a value of 8 MB for the Allocation group size property, the allowable NBPI values are 512, 1024, 2048, 4096, 8192, and 16,384. The range of allowable NBPI values scales up as the allocation group size increases. If you select a value of 16 MB, the NBPI values are 1024, 2048, 4096, 8193, 16,384, and 32,768. If you select a value of 32 MB, the NBPI values are 2048, 4096, 8192, 16,384, 32,768, and 65,536. If you select a value of 64 MB, the NBPI values are 4096, 8192, 16,384, 32,768, 65,536, and 131,072.

The default value is 512 for the compressed option for the File system type property. The default value is 4096 for the standard and large file enabled options for the File system type property.

You cannot set this property when the value for the File system type property is enhanced.

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start of changeAllocation group size (MB)end of change
start of changeSelect the size for allocation groups for the file system. You can select a value of 8, 16, 32, or 64. You must select an allocation group size that yields allocation groups that are large enough to provide for contiguous resource allocation over time. Allocation groups are limited to a maximum of 128 groups. The minimum allocation group size is 8192 file system blocks.

The value that you select for this property determines the range of values that you can select for the Number of bytes per i-node property. The default value is 8 for the standard and compressed options for the File system types property. The default value is 64 for the large file enabled option for the File system type property.

You cannot set this property when the value for the File system type property is enhanced.

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Logical volume for log
start of changeSelect or specify the name of the logical volume to use as the logging device for the new file system. You can select the name of any logical volume that you created on the Logical volumes page. The logical volume must be compatible with the File system type that you select.

If you are creating a file system type of standard, compressed, or large file enabled, select a logical volume with a type of jfslog from the list of available logical volumes.

If you are creating a file system type of enhanced, select a logical volume with a type of jfs2log from the list. Alternatively, you can select a value of inline to have the journal log for the file system be within the file system itself.

If you specify a new name, the wizard creates a logical volume with this name for you. If you do not enter a value, the wizard also creates a logical volume for you. The wizard sets the properties for the logical volume that best accommodate the file system configuration options that you specify.

Inline log size (MB)
Specify the size, in megabytes, for the optional inline journal log. The default value is the size of the file system divided by 256. This property is available only for the enhanced option for the File system type property, and only if you select a value of Inline for the Logical volume for log property.
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Extended attributes format
Select the format version to use for storing named extended attributes in the JFS2 file system. This property is available only for the enhanced option of the File system type property. Select one of the following format versions:
Version 1
Select this value to configure the file system format to be compatible with AIX Version 4.2, or earlier. This option is the default value.
Version 2
Select this value to configure the file system to support scalable and named extended attributes and to support access control lists (ACLs) for network file system 4 (NFS4).
start of changeEnable quota managementend of change
start of changeSelect how to handle quota management for the file system. Quota management controls the use of disk space. This property is available only for the enhanced option for the File system type property.
No
Select this value to disable quota management on the file system. The file system does not collect any usage statistics or enforce usage limits. This option is the default value.
All
Select this value to enable full quota management on the file system. The file system collects and maintains file and block usage statistics and enforces usage limits for all users and all user groups.
User
Select this value to enable quota management on the file system for all individual users.
Group
Select this value to enable quota management on the file system for all user groups.
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Actions

Add Another
Click Add Another to add another set of property fields so that you can configure another file system to include in the volume group.
Remove
Click Remove to remove a configured file system from the volume group and remove all content from the property fields.