Red Hat Bugzilla – Bug 476755
adding RAID-1 member fails to rebuild / corrupts array
Last modified: 2009-07-14 11:53:47 EDT
Created attachment 327181 [details]
Description of problem:
There seems to be a problem when removing a RAID mirror device and re-attaching another one in its place when the replacement device gets the same device name (e.g. /dev/sdc1). The kernel doesn't always resync the replacement mirror, which leads to rapid filesystem corruption.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. stop md array (optional, --fail, --remove also shows problem) and physically remove one mirror device
2. start array (--assemble --scan --auto=md) with missing mirror; array starts with missing (not needed in --fail, --remove case)
3. attach replacement array mirror device and do: mdadm --add /dev/mdX /dev/sdY1
Array does not resync new drive. Access to the array will quickly cause corruption.
Each mirror device has a matching RAID UUID.
The drives are attached via USB.
If the device hasn't had any access, it's possible to --fail, --remove the non-syncing mirror device, then power cycle the drive. Then if it's added again, the kernel will start a resync, but not on the first attachment.
I first noticed this on Fedora 7 or 8; previous versions didn't do it.
I'll attach an annotated dmesg which should be more clear.
Oh, and there's no bitmap on this array.
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