using warm standby with drbd???

Hi All!

I have configured the warm standby using WAL FILES and DRBD. The wal files
are generated as server A. I am using DRBD to replicate these wal files
between server A and server B. The DRBD service is running as Primary on
Server A and secondary on Server B. The wal_files are written to the server
B, but there is a drawback for DRBD. The filesystme needs to be unmounted on
the server B (where DRBD is running secondary role).

So recovery is not countinuous.(file systme is unmounted). To start the
recovery, i need to change the DRBD role to primary on server B. After that
i have to mount the filesystem. Once i mount the filesystem, the recovery
process starts.

Is there any way in which i need not switch secondary/primary role for DRBD
on server B?
Is there any way in which i can have the file system mounted on server B,
running DRBD secondary role?

How else can i replicate the wal_files? ( i don't want to user common file
system ,,, NFS,,, etc.)?

Another thing which i want to ask is that if we are generating archives
every 1 minute. then what happens to the data which was written to the
server A after 35 seconds after the last wal file generation.(server A
crashes).

Since this data has not been archived (it was supposed to archive after 1
minute), do i think that this is the loss of data in a server A crash as
this 35 second data has not been written to the archived logs and neither
has been transported to server B?

A quick reply is highly appreciated!

Thanks!