I've been on a mission to recover files from one of my 2 perfectly working, non-corrupted, non-encrypted NAS drives that used to be in RAID 1. The NAS was Patriot Javelin S4, which (as I found from my research) uses Promise Fasttrack fake raid controller.
Information is very scarce on this, so for googlers in the same situation here are some facts about this NAS:
- RAID controller: Promise FastTrack (FakeRaid)
- Volume system: LVM2
- Filesystem: XFS with 64kb block size (65536 bytes)
- Arch: 800MHz AMCC PowerPC processor, 256MB RAM (thanks to Matthew's research)
I only had Windows 10 and MacOS computer when doing this, and I found no software capable of mounting XFS in LVM2 volume (with 1 exception, more on this below). I had to take out my old netbook Acer Aspire One, and install puppy linux on it (specifically lxpup flavor).
On puppy linux I managed to mount this file system using a tool called
dmraid. This tool has a way of mounting a pdc volume, which is its id for Promise FastTrack. Once I managed to jump through some hoops mounting it, I gained access to the actual XFS filesystem, and to my dismay, it turned out to be 64kb block size.
This is where I started googling things like "read xfs 64kb block size" and getting nowhere. Only a few answers that say: "linux can't read block sizes bigger than 4kb, unless you patch the kernel". I have no idea how to patch the kernel, and I'm baffled that there isn't any kind of emulation to allow this.
I mentioned 1 exception among apps that can't read this partition on Win/Mac. That exception was ufsexplorer. It's a $100 app, it was able to seamlessly show me the files. I copied a few files proving that it works, but the trial version only allows copying tiny files.
I refuse to believe that there isn't a free open source tool out there of any level of complexity that can't help me read 64kb xfs.
My question is: does anybody know of any such tool? Any specific instructions on how to get the data using one or more tools, or kernel patching, or something else (free) are greatly appreciated.
One more point: I would highly prefer to not have to create local images of these drives (unless that's the only way). After all, it's 2TB of data, I may not have this much space.
P.S. If there's a known linux I can install on my Acer that can read 64kb xfs, that's a viable solution too.
Update 1: I just learned about https://www.cgsecurity.org/wiki/TestDisk. Might be worth a shot. Will report back once I had time to try it.
Update 2: TestDisk seems to be recognizing the presence of XFS partition, but I'm not sure how to proceed form there. I don't see a way to extract a file, so I just abandoned it for now, and trying the qemu approach in Matthew's answer.