Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[arek1]

Hi All,

When I bought my DNS-323 I put in it two identical 500 GB HD. I setup it for RAID and have 500 GB instead 1 TB. I made it because I thought it is much safer - if one disc will fail all data will be safe on other, just need to replace failed disc and all will be OK but now I am not sure is it correct.
Can any body explain me is it true?

Best wishes
ArekS

[dosborne]

Raid 1, mirroring, does just that. The contents (files) on both disks are identical and are "seen" as a single drive to most systems. If one drive has a hardware failure, your data is still available on the other drive.

It is NOT a backup and if you delete a file it gets removed from both.

It can be part of a backup strategy and does prevent against data loss due to hardware failure.

[arek1]

Thank you, now I am filling much better.

ArekS

[redant2u]

Jip - spot on - mirror is best in the scenario but there is nothing that is 100% fail proof from human error... 

[fordem]

RAID1 is neither for speed nor safety - it's for availability.

The purpose of RAID1 is to reduce the potential downtime that would occur in the event of a disk failure - it should NEVER be considered part of a backup strategy, unless, your RAID1 array happens to be on a backup device separate from your primary data store.

Unless you need constant, uninterrupted availablity of your data, then RAID is not the solution you're looking for.