Fast CAS facts

This article can also be found in the Premium Editorial Download: Storage magazine: New rules change data retention game:

Content-addressed storage (CAS) systems locate items by unique identifiers based on the content itself rather than...

its location in storage. This is different from data deduplication, which scans block-level data for duplicate blocks and replaces duplicates with pointers to the original copy of the block.

When an object is stored in a CAS system, its content is scanned and an identifier, such as a hash value, is generated and then used to retrieve the object as needed. Because each object's identifier is based on its content, it's easy to verify that the retrieved object hasn't been changed since it was stored, which makes CAS a good fit for compliance-related storage. But that also means any change to an object stored in a CAS system creates a new object that's stored separately, so CAS is best suited to data that won't change once it's saved.

When you're considering CAS, remember that storing an object in a CAS system requires more time and computing power than storing it in a conventional file system.

--Rick Cook


For the full feature go to http://searchstorage.techtarget.com/tips

 

This was first published in September 2007

Dig Deeper on Storage Resources

PRO+

Content

Find more PRO+ content and other member only offers, here.

0 comments

Oldest 

Forgot Password?

No problem! Submit your e-mail address below. We'll send you an email containing your password.

Your password has been sent to:

-ADS BY GOOGLE

SearchSolidStateStorage

  • Flash technologies remain hot in 2016, experts predict

    Experts predict solid-state technology will remain hot in 2016, leading to the demise of high-speed hard disk drives, as ...

  • Tintri VMstore T5000

    Like all of its VM-aware storage systems, Tintri’s first all-flash array -- the Tintri VMstore T5000 -- allows admins to bypass ...

  • SolidFire SF9605

    The high-capacity SolidFire SF9605 uses SolidFire’s Element OS 8 (Oxygen) to deliver new enterprise features such as synchronous ...

SearchVirtualStorage

SearchCloudStorage

SearchDisasterRecovery

SearchDataBackup

Close