Infrant Technologies ReadyNAS Duo, Руководство пользователя

Страница: 39 / 98

You can also specify how long a snapshot should last. If you will be using snapshots for backups,
you can schedule the snapshot to last slightly longer than the expected duration of the backup.
Having an active snapshot can affect the write performance to the ReadyNAS, so deactivating it
when not needed may be advantageous in write-intensive environments.
When a snapshot is taken, snapshots of shares appear in your browse list alongside the original
shares, except the snapshot share names have
–snap appended to the original share names. For
example, a snapshot taken of share backup will be available as backup-snap .
You can traverse a snapshot share just as you would a normal share except that the snapshot share is
read-only. If you wish, you can select a detailed listing to show the snapshot time in the description
field.
Do note that snapshots can expire when the snapshot reserved space is filled. The snapshot
mechanism keeps track of data that has been changed from the original volume starting at the point
when the snapshot is taken. All these changes are kept in the snapshot reserved space on the
volume. If you look at the
Disk space utilization information just below the Volume tab, you will
see how much space has been reserved for snapshots.
From the point when the snapshot is taken, if changes on the volume exceed this reserved space, the
snapshot is invalidated and can no longer be used.
39
Page 39