Feature

Ask the Expert:RAID rebuilds

Ezine

This article can also be found in the Premium Editorial Download "Storage magazine: Multiprotocol arrays provide NAS and SAN in a single box."

Download it now to read this article plus other related content.

Q: I run four 400GB SATA drives configured with RAID 5. I want to replace them with four 750GB drives. Can I rebuild and then swap individual drives?


A: RAID rebuilds take quite a long time and are a resource-intensive operation, so expect your application to suffocate while this is happening. Rebuilds are a protection mechanism and aren't designed for data migration. Assuming your 750GB drives are sup-ported with your RAID adapter, the RAID group will only utilize the first 400GB of storage on each 750GB drive, leaving the remainder inaccessible.

The usual way to migrate data with internal server-based storage is to copy the data to a separate set of drives or temporary storage, install the new drives and then copy everything back, remembering to preserve all file attributes. A tool like Robocopy can do this.

--Ashley D'Costa, enterprise solutions architect, Mainland Information Systems Inc.

Requires Free Membership to View

This was first published in March 2008

There are Comments. Add yours.

 
TIP: Want to include a code block in your comment? Use <pre> or <code> tags around the desired text. Ex: <code>insert code</code>

REGISTER or login:

Forgot Password?
By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy
Sort by: OldestNewest

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: