For data sets from 2 to 4 disks -> 1 parity disk may be enough
that is what i have..... 4 disk....
but as you say... MAY be enough
For data sets from 2 to 4 disks -> 1 parity disk may be enough
that is what i have..... 4 disk....
but as you say... MAY be enough
but yes that table is not for simple minded people like me
i read it as with 1 parity drive i can recover at least 2 failing disk
Q... it says in config:
# This file is auto-generated by openmediavault (https://www.openmediavault.org)
# WARNING: Do not edit this file, your changes will get lost.
so if i cant edit the file directly how do i change the excludes ?
In the plugin, use the Rules section.
that is what i have..... 4 disk....
but as you say... MAY be enough
That just means that one parity disk for a group of 8 disks is insufficient. That will not work.
but yes that table is not for simple minded people like me
That's not the point, I think you just need to understand it. I don't know if you're offended but it's certainly not my intention. I'm just trying to get you out of your mistake.
i read it as with 1 parity drive i can recover at least 2 failing disk
If you've read this somewhere it's misspelled. Show me where, please.
In any raid on any file system (snapraid, mdadm, btrfs, zfs...), one parity is used to save a disk. Two parities allow you to save two disks.
a group of 8 disks is insufficient.
i have 4 not 8
if you're offended
i'm not, just very confused on that table
. Show me where, please.
https://www.snapraid.it/faq#howmanypar
"As a rule of thumb you can stay with one parity disk (RAID5) with up to four data disks"
of course the "rule of thumb" is what i did not catch... but then again we all think different
I don't see where it says you can recover from the failure of two drives in an array with one parity drive.
However, on that same website I see this here https://www.snapraid.it/manual
Zitat4 Getting Started
To use SnapRAID you need to first select one disk of your disk array
to dedicate at the "parity" information. With one disk for parity you
will be able to recover from a single disk failure, like RAID5.If you want to be able to recover from more disk failures, like RAID6, you must reserve additional disks for parity. Any additional parity disk allow to recover from one more disk failure.
I haven't used snapraid in a long time, but the concepts are still the same.
I don't see where it says you can recover from the failure of two drives in an array with one parity drive.
what i'm saying is it depends on how you understand the table and what knowledge you have
i now got more wise and know it will be 1 disk needed for each failing
i now got more wise and know it will be 1 disk needed for each failing
Ok, I'm sorry that I was the devil that told you this. I just hope that before starting this restore exercise you had a backup, I haven't read the entire thread.
Good luck!
hehe... i did a sync and scrub...
then pulled 2 drives and created 2 blank drives with same uuid's etc to simulate that i inserted new drives
giving them the same uuid's etc takes a few extra steps but it make it easy in that i dont need to change anything
once i put back one of the org drives the restore works.... it takes a lot of time but so far no unrecoverables
I'm sorry that I was the devil that told you this.
hehehe.... no worries, better be told now than spending weeks thinking i did something wrong
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