Linux RAID 1 losing synchronization
 

Hi.

If there is a more appropriate forum for this question, thn please forward me.

I am using the Linux MD raid system to mirror the data on a Linux appliance. I have seen an issue on several systems where the members of the the MD devices appear to lose synchronization. In some cases the driver seems to automatically start a resync copy, but in other cases a member of the devices is failed and we have to use a script we have written that calls mdadm to remove and re-add partitions to the devices.

Can anyone help me understand why I am seeing this problem. the disks are healthy and the rebuilds complete without any problems.

This system is based on Debain 2.6.26-1 kernel.

thanks in advance for any assistance.

Simon.

Have you checked the logfiles around the time the sync fails?
Apart from that, try a fsck ? Note that by default for ext3 it only checks the metadata, so it may report 'clean', but not actually be ok.
You'll have to umount and use fsck -f to force it.
Are the disks same make/model/size?