So one of the reasons why people don't recommend raid 5 anymore is because if a 2nd drive fails during a rebuild (not unlikely to happen, apparently), then you lose your data
If you have snapraid set up with 1 parity drive, what happens to the array/your data if a second drive fails at that point? In other words, is it safe to run only 1 parity drive with snapraid or are 2 still recommended (as in the case with raid 5/6)?
When a second drive fails, you loose the data which is stored on this drive. BUT you keep the data you have on your working drives.
When a second drive fails, you loose the data which is stored on this drive. BUT you keep the data you have on your working drives.
so the second drive data is lost, but the first failed drive is still recovered correctly?
Nope. If a second Data drive failes the parity is - to my knowledge - worthless since it can't rebuild against two missing drives. Only Raid6 can do that (SnapRAID has a similiar option for 2 or more parity drives.).
Greetings
David
With 1 (one) Parity-drive, you can only restore 1 (one) Data-disk.
http://snapraid.sourceforge.net/faq.html#diffraid
from the manual:
ZitatIt's able to recover damages only from a limited number of disks. With a Backup you are able to recover from a complete failure of the whole disk array.
Sorry to get this thread alive again after some years. I'm planning to use SnapRAID plugin and I'm worried about something that other people are also afraid of.
I had a look around and Googling here and there, I went to a SourceForge page where @Solo0815 was also present. I'm worried about running the sync command daily as a cron job and having a disk failure and thus, having a corrupted-data syncing to the content and parity disk.
I'm not very friendly with coding and I read in that thread that someone had done a little script to avoid a sync command if a disk failed. After that, 'solo' appeared and told (or I understood) that the SnapRAID plugin has yet implemented this.
So since I'm not a native English, I would like to have some clarification about that.
Thanks in advance.
Guillem.
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