Re: First raid1 sector gets zeroed at first reboot
flat view
From: Asdo <hidden>
Date: 2011-08-17 16:45:26
On 08/17/11 16:34, John Robinson wrote:
On 17/08/2011 15:00, Asdo wrote:quoted
No you are confusing it with metadata 1.1 . Metadata 1.0 has the data at the end like 0.9 .No I'm afraid it's you that's confused. Metadata 1.0 has the *metadata* at the end, like 0.9, so it has the data i.e. filesystem area at the beginning. Take a look with mdadm -D, the data offset is zero. This is why partitions with 0.9 or 1.0 metadata in RAID-1 can be used individually to boot from because the partitions look identical to ones that just have filesystems on them.
That's correct, the same thing I meant. Then I had misinterpreted you:
The first sector of a md RAID with metadata 1.0 is in its data area, so there's no way md is writing to this area itself, it's almost certainly the filesystem that's writing it. This is an interesting observation then. ("no way" is a bit extreme though) You are right in the sense that it might have been the filesystem that is doing something at the first remount, and not MD. I can't be sure it's MD anymore. Still, this is wrong, why should the filesystem wipe its own boot sector?It's ext3 btw. If no one pops up with an explanation here on linux-raid I will also ask there. I still stand that what I am doing is correct. I am using the partition boot sector properly http://en.wikipedia.org/wiki/Volume_boot_record Thank you