Veritas™ File System 5.0.1 Administrator's Guide

file system, use the asynchronous method to mark the Storage Checkpoint you

want to convert for a delayed conversion. In this case, the actual conversion will

continue to be delayed until the Storage Checkpoint becomes the oldest Storage

Checkpoint in the file system, or all of the older Storage Checkpoints have been

converted to nodata Storage Checkpoints.

Note: You cannot convert a nodata Storage Checkpoint to a data Storage

Checkpoint because a nodata Storage Checkpoint only keeps track of the location

of block changes and does not save the content of file data blocks.

Showing the difference between a data and a nodata Storage

Checkpoint

The following example shows the difference between data Storage Checkpoints

and nodata Storage Checkpoints.

Note: A nodata Storage Checkpoint does not contain actual file data.

See “Converting a data Storage Checkpoint to a nodata Storage Checkpoint”

on page 94.

To show the difference between Storage Checkpoints

Create a file system and mount it on /mnt0, as in the following example:

# mkfs -F vxfs /dev/vx/rdsk/dg1/test0

version 7 layout

134217728 sectors, 67108864 blocks of size 1024, log \

size 65536 blocks, largefiles supported

# mount -F /dev/vx/rdsk/dg1/test0 /mnt0

Create a small file with a known content, as in the following example:

# echo "hello, world" > /mnt0/file

Create a Storage Checkpoint and mount it on /mnt0@5_30pm, as in the following

example:

# fsckptadm create ckpt@5_30pm /mnt0

# mkdir /mnt0@5_30pm

# mount -F vxfs -o ckpt=ckpt@5_30pm \

/dev/vx/dsk/dg1/test0:ckpt@5_30pm /mnt0@5_30pm

95Storage Checkpoints

Storage Checkpoint administration