Re: RAID5 won't mount after reducing disks from 8 to 6
flat view
From: Matt Tehonica <hidden>
Date: 2011-02-17 01:47:08
To be honest, I couldn't find good directions on how exactly to resize an array to be smaller so I put some bits and pieces together to do it. Guess I didn't understand everything beforehand because I didn't read anything about resizing the file system. I thought setting the "array-size" would take care of moving data before rebuilding onto the 6 disks. Since I haven't resized the XFS filesystem, any recommendations on what to do next? Think it's possible to recover any of the data? For what it's worth, I haven't done anything to the 2 disks that I was going to remove. Thanks for the help. On Feb 16, 2011, at 8:42 PM, NeilBrown wrote:
On Wed, 16 Feb 2011 19:24:41 -0500 Matt Tehonica [off-list ref] wrote:quoted
Hi all, I converted my RAID5 from 8 disks to 6 disks using "mdadm --grow /dev/md0 --array-size" and then "mdadm --grow /dev/md0 --raid-devices=6" and after rebooting, it won't mount. It has been running fine for about a year. File system is XFS. Here is some info on it........ uhmm... you did resize the filesystem to be smaller before you resized the array to be smaller ... didn't you? Because if you didn't you have probably just lost 1/3 of your data. That is the whole point of having to set the array-size first. You then make sure your data is still safe before performing the irreversible reshape. If you did reshape the XFS filesystem first, then something else must be wrong. NeilBrown -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html