RAID broken .... /dev/sd? drive name changed

[Muhammad Yousuf Khan <sirtcp@gmail.com>]

i have got 4 drives.

/dev/sda /dev/sdb /dev/sdc and /dev/sdd

/dev/sda raid mirror with /dev/sdc

and

/dev/sdb was raid mirror with /dev/sdd

now this time i unplug the /dev/sdd for some problem diagnostics now
/dev/sdb becomes /dev/sdc and /dev/sdc becomes /dev/sdb and my whole
raid got massed. help please.

Thanks