Hylton Conacher(ZR1HPC) wrote:
Per Jessen wrote:
Ken Gramm wrote:
Well I can tell you from first hand experience, if all of the drive were purchased at the same time, have all been running in the same machine for the same amount of time, and have all been accessed around the same amount of times, your chances of a second drive failing during a rebuild is very high. Especially if you are getting close to the hard drives MTBF.
My thoughts exactly. Which is why I'm concerned.
I've been watching this thread for a while and it definitely seems to me that you are looking for an immediate backup to prevent data loss.
RAID is not a backup method, it is a method of storing data. You are going to have a drive failure and recovering from it as quick as possible is the key.
From what I saw he was aiming to set up a raid as robust as possible. The goal was rather to do as much as possible to keep the raid (and thus the services using the raid) up and avoid downtime and data loss. If you need the backup you lose the data that changed after the backup until the time of the crash. You also have a downtime for your services. I naturally assume that the data will be backup up, but that will only be the last resort. So the focus of the discussion is rather how to setup a raid as robust as possible with the available hardware. Sandy -- List replies only please! Please address PMs to: news-reply2 (@) japantest (.) homelinux (.) com