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I need to copy data from a single HD, which used to be part of a Linux RAID 1. I've googled around, but can't find any clue how to mount partitions from this single HD.

Background: The HD comes from a linux based NAS box Synology DS207+. The NAS uses ext3 as filesystem. Both NAS disks are fine, but the other NAS hardware is dead and not worth repairing or replacing.

Christian Funk
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  • any idea how to do this on a Mac? I'll be needing an [Ext4 driver](http://osxdaily.com/2014/03/20/mount-ext-linux-file-system-mac/) for sure, but is there anything else that need to do to mount the formerly RAID-1 drive? – adib Nov 26 '14 at 15:50

2 Answers2

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An important step is to have mdadm scan for the disk prior to attempting to mount anything:

mdadm --detail --scan

I can't recall from memory but the --assemble flag may be necessary but try the above first then try mounting via:

mount /dev/md# /path/to/mount
RyanH
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  • How to install `mdadm` to mac os x? – skywinder Aug 31 '16 at 18:21
  • You might need to launch `mdadm --run /dev/md#` to start a partially assembled array – Saïmonn Jun 05 '17 at 12:32
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    @skywinder `mdadm` in Linux is just a tool to control the Linux kernel software RAID subsystem, so it won't be useful in a Mac unless there is also a software RAID driver with a Linux-style API added to the Mac kernel - and such a thing might not exist. – telcoM Dec 18 '19 at 05:18
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When you only have a single part of a Raid array, it is in an incomplete state and for safety reasons, you basically have to force mount it.

There are many linux distributions, for me, in Ubuntu, I used:

 mkdir /mnt/tempdisk
 sudo mount /dev/sda3 /mnt/tempdisk -o force

(replace sda3 with the hard drive)

if a *nix expert wants to down vote me, I will delete my answer as it has been a few years since I did this, and I followed a guide at the time.

William Hilsum
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    You don't have to force anything. Just mount the md device: "mount /dev/md1 /mnt/myfolder". The degraded array will run without any problem. But nothing garantee the Symbology use a standard Linux RAID. – Gregory MOUSSAT Apr 26 '12 at 17:50
  • Ext[234] has no "force" mount option, so this answer is nonsense. – psusi Apr 23 '17 at 01:54