Hello everyone, this is my first post on HDD guru and I'm resuming this old post as it has been useful to me and I want to add some infos that may help others.
This is about a 4big quadra RAID5 with 3 of 4 disks available and an XFS filesystem (no partition table) on it.
The missing disk on the quadra was the fourth looking from the back and starting from left.
After many tries I've found the right disk order by looking at the XFS internals:
https://cdn.app.compendium.com/uploads/ ... _final.pdfPage 8, primary AGs.
SB AGF AGI AGFL were on the first blocks of every disk so it was easy to find the right order.
I spent many time trying combinations with the missing disk as the last one but it was not.
Check the attached screenshot for details.
As you already said and it was very useful to me the stripe size is set to one sector.
Parity distribution as Left-Asymmetric.
Once configured this way UFSExplorer showed me the green (healthy) XFS partition and it was immediately able to let me browse the directory structure.
As I'm with the trial version i'm dumping an image of this to a file and I'm going to mount it on a linux machine. Four days left. In many other combinations with was able to see the XFS partition but without access to directory structure and compromised files data trying to recover with ufsexplorer.
A note about mdadm which looked almost perfect for this and I previously tried (working on copied versions of the disks i have to avoid damage to the original ones): unfortunately mdadm doesn't allow for 512bytes stripe size, so it's a no-no.
Thats all folks,
thank you for your help.