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Full Discussion: Mount
Special Forums Hardware Filesystems, Disks and Memory Mount Post 18147 by AtleRamsli on Monday 25th of March 2002 04:56:03 AM
Old 03-25-2002
Some thoughts about new and exciting filesystems
------------------------------------------------
... the eternal optimist strikes again Smilie
------------------------------------------------
Please be careful to check the comments that follow each filesystem module!
Some filesystems are experimental, and should only be used by hackers who are working to find bugs and provide patches.
The filesystem 'translates' raw data to information, both ways:

[disk_blocks]
v ^ v
| | |
/ | | raw data
........ / .... | .| .................
/ | | semantcis
/ | |
| | |
v ^ v
[filesystemA] [filesystemB]
v ^ v
.... | ........ | .| ..................
| | | presentation
v ^ v
[files,directories]


Imagine what happens if there is a bug in the filesystem when storing your latest report!

This is how it is possible to mount a file as a filesystem, and that is a good way to test if a filesystem is 100% error free, mount a test file and check!
The only real way to protect your data is with backups.

In general the rule is:

---------------------------------------------
Do NOT backup the stuff that you WANT to lose
---------------------------------------------

If you are Ok with doing one week's work all over again from scratch, back up every week.
Otherwise, back up every time you have produced something you do not want to lose.

Atle
 

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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)
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