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Old 06-10-2008, 03:15 PM   #1
Registered: Apr 2003
Location: United States
Distribution: RHEL 5.4, Snow Leopard
Posts: 87

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Raid 1 with mdadm, restarting causes full reconstruction

Hi all, I'm using mdadm to to a level 1 raid on two disks (obviously). When I take out disk A and immediately put it back in, it resyncs without a problem without a reconstruction. But if I restart with drive B at the helm, then put A back in after the restart, it does a full reconstruction on A even though nothing has changed. Any idea why this is? (My bitmap is set to internal). I know mdadm is complicated and I should be providing a lot more information, but any vague ideas?

Last edited by jeriryan; 06-10-2008 at 03:17 PM.
Old 06-12-2008, 09:56 AM   #2
Registered: Feb 2007
Posts: 122

Rep: Reputation: 22
It probably looks at the reboot - possibly a journal has changed - and decides it needs to rebuild. You can add the drive back in and tell mdadm not to resync, but that can be risky.

Are you doing this on a regular basis or just testing it out?
Old 06-12-2008, 02:28 PM   #3
Registered: Apr 2003
Location: United States
Distribution: RHEL 5.4, Snow Leopard
Posts: 87

Original Poster
Rep: Reputation: 15
Just testing.


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