large file options is set Post: 302076927

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Operating Systems HP-UX large file options is set Post 302076927 by Perderabo on Friday 16th of June 2006 05:26:55 PM

06-16-2006

Administrator Emeritus

As of HP-UX 11i, nolargefiles is the default. When a filesystem is created, with either mkfs or newfs, a "-o largefiles" can enable the largefile capability. Or "-o nolargefiles" can be used to explicit request a limited filesystem.

After a filesystem has been created, fsadm can be used with "-o largefiles" to convert it to a largefile filesystem. In some cases, you can switch back with a "fsadm -o nolargefiles".

If you care which you have, you can use the options largefiles or nolargefiles when you mount the filesystem. This will not convert a filesystem, but the mount will fail if the filesystem does not match the flag used on mount.

If a filesystem is mounted on, say, /mountpoint, and you wonder what size files it supports, anyone (even non-root users) can do "getconf FILESIZEBITS /mountpoint". This will return 32 for "nolargefiles" filesystems and a larger integer for "largefiles" filesystems. (I am getting 42...so do not expect 64.)

All of this defines what the filesystem can handle. If your program is a 32 bit program, it may not be able to process large files. (But with special techniques, 32 bit programs can process largefiles.)

Perderabo

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xfs_freeze

xfs_freeze(8)						      System Manager's Manual						     xfs_freeze(8)

NAME

       xfs_freeze - suspend access to an XFS filesystem

SYNOPSIS

       xfs_freeze -f | -u mount-point

DESCRIPTION

       xfs_freeze suspends and resumes access to an XFS filesystem (see xfs(5)).

       xfs_freeze  halts  new access to the filesystem and creates a stable image on disk.  xfs_freeze is intended to be used with volume managers
       and hardware RAID devices that support the creation of snapshots.

       The mount-point argument is the pathname of the directory where the filesystem is mounted.  The filesystem must be  mounted  to	be  frozen
       (see mount(8)).

       The  -f flag requests the specified XFS filesystem to be frozen from new modifications.	When this is selected, all ongoing transactions in
       the filesystem are allowed to complete, new write system calls are halted, other calls which modify the	filesystem  are  halted,  and  all
       dirty data, metadata, and log information are written to disk.  Any process attempting to write to the frozen filesystem will block waiting
       for the filesystem to be unfrozen.

       Note that even after freezing, the on-disk filesystem can contain information on files that are still in the process of	unlinking.   These
       files will not be unlinked until the filesystem is unfrozen or a clean mount of the snapshot is complete.

       The  -u	flag  is used to un-freeze the filesystem and allow operations to continue.  Any filesystem modifications that were blocked by the
       freeze are unblocked and allowed to complete.

       One of -f or -u must be supplied to xfs_freeze.

NOTES

       A copy of a frozen XFS filesystem will usually have the same universally unique identifier (UUID) as the original, and  thus  may  be  pre-
       vented from being mounted.  The XFS nouuid mount option can be used to circumvent this issue.

       In  Linux  kernel version 2.6.29, the interface which XFS uses to freeze and unfreeze was elevated to the VFS, so that this tool can now be
       used on many other Linux filesystems.

SEE ALSO

       xfs(5), lvm(8), mount(8).

																     xfs_freeze(8)