Veritas™ File System 5.0.1 Administrator's Guide

vol1

/dev/vx/dsk/fsvol/ /fsvol_may_23 vxfs ckpt=may_23 0 0

vol1:may_23

■ To mount a Storage Checkpoint of a cluster file system, you must also use the

-o cluster option:

# mount -F vxfs -o cluster,ckpt=may_23 \

/dev/vx/dsk/fsvol/vol1:may_23 /fsvol_may_23

You can only mount a Storage Checkpoint cluster-wide if the file system that

the Storage Checkpoint belongs to is also mounted cluster-wide. Similarly,

you can only mount a Storage Checkpoint locally if the file system that the

Storage Checkpoint belongs to is mounted locally.

You can unmount Storage Checkpoints using the umount command.

# umount /fsvol_may_23

# umount /dev/vx/dsk/fsvol/vol1:may_23

Note: You do not need to run the fsck utility on Storage Checkpoint pseudo devices

because pseudo devices are part of the actual file system.

Converting a data Storage Checkpoint to a nodata Storage Checkpoint

A nodata Storage Checkpoint does not contain actual file data. Instead, this type

of Storage Checkpoint contains a collection of markers indicating the location of

all the changed blocks since the Storage Checkpoint was created.

See “Types of Storage Checkpoints” on page 88.

You can use either the synchronous or asynchronous method to convert a data

Storage Checkpoint to a nodata Storage Checkpoint; the asynchronous method

is the default method. In a synchronous conversion, fsckptadm waits for all files

to undergo the conversion process to “nodata” status before completing the

operation. In an asynchronous conversion, fsckptadm returns immediately and

marks the Storage Checkpoint as a nodata Storage Checkpoint even though the

Storage Checkpoint's data blocks are not immediately returned to the pool of free

blocks in the file system. The Storage Checkpoint deallocates all of its file data

blocks in the background and eventually returns them to the pool of free blocks

in the file system.

If all of the older Storage Checkpoints in a file system are nodata Storage

Checkpoints, use the synchronous method to convert a data Storage Checkpoint

to a nodata Storage Checkpoint. If an older data Storage Checkpoint exists in the

Storage Checkpoints

Storage Checkpoint administration