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Backup in a snap: A guide to snapshot technologies
This article is part of the Storage magazine issue of Vol. 8 Num. 7 October 2009
Snapshot technologies are commonly used to enhance data backup systems and dramatically shorten RTOs and RPOs. But you need to know how snapshot implementations can vary, and what those differences could mean to your environment. A snapshot is commonly defined as a copy of a set of files, directories and/or volumes as they were at a particular point in time. As its name suggests, a snapshot is very much like a photograph because it captures an image of a certain set of data at a specific moment or point in time. Snapshot technology was originally architected to solve several data backup problems, including: Backing up data that's too large to complete in the allocated time Failing to back up data because it has moved from a directory that hasn't been backed up to one that already has Corruption of backed up data that can occur when it's being written to while it's being backed up The affect on application performance while a backup is in process All of these backup problems can be resolved with snapshots. But snapshots shouldn't...
Features in this issue
Our latest Storage Purchasing Intentions survey suggests that there may be a glimmer of hope for the economy based on storage managers purchase plans.
Snapshots are used to enhance backup systems and shorten RTOs and RPOs. But you need to know how snapshots can vary, and what those differences could mean to your environment.
More and more shops are archiving their email, which is good thing considering ever-escalating message traffic and stringent compliance regulations.
If you thought you knew cloud storage, think again. With scores of vendors touting internal storage clouds, we'll give you the lowdown on what makes a storage cloud "internal."
Columns in this issue
With the parallel file system pNFS now part of the NFS 4.1 protocol, NAS storage will shift into a higher gear.
There's a lot to like about cloud storage, and its benefits in terms of cost savings and convenience are attractive. But there are some residual effects you should consider.