LinuxQuestions.org

LinuxQuestions.org (/questions/)
-   Linux - Server (http://www.linuxquestions.org/questions/linux-server-73/)
-   -   Software RAID-5 expandability (http://www.linuxquestions.org/questions/linux-server-73/software-raid-5-expandability-904082/)

lucazorzi 09-20-2011 04:02 PM

Software RAID-5 expandability
 
Hi guys,
I am currently running my homeserver with 2 TB disks in RAID-0. I am running out of space and I will soon migrate it to a RAID-5, throwing in an additional 2 TB drive (all the data on the current drives will be transferred somewhere else, so basically I'll be creating a RAID-5 array from scratch).

Eventually I will run out of space once again, and I'll have to expand the array.
I have found this guide that explains a simple way to expand a RAID-5 array, but I have a question about that: if I add another drive in such way, will I lose redundancy? If I understand correctly, RAID-5 calculates parity data that will allow it to run even if one of the 3 drives is broken, but what happens if you have more than 3 drives?

I experimented a little in a VM and it seems that it works fine, even disconnecting one (virtual) drive from the VM.

Thanks in advance for your help.

zer0signal 09-20-2011 06:25 PM

it does not matter how many drives you have in a raid 5, you can only lose 1 with the ability to recover and use that array in a degraded state... anything else and you done for...


All times are GMT -5. The time now is 03:33 AM.