Hi,
I am looking for a solution that I can use as a realtime snapshot or maybe
it should be called realtime raid or whatever.
What I want is like this:
Say I have a VG1 and VG2. I use VG2 as a backup VG2 and some machines
will mount it as read-only( I mean LV2 on VG2) My main server (which runs
mysql and all write operations will go to LV1) will run mysql and use
/sql as its --data-dir. /sql uses /dev/VG1/LV1. But every write operations
on LV1 that resides on VG1 should go to VG2 thus to LV2 too.
I have found that nbd ord drbd does similar things. But nbd just exports a
block device (JUST ONE block device) so other machines can mount it. DRBD
is closer to what I want but I can't mount drbd on secondary (backup
machine) even as read-only
To depict what I want
rw
|SERVER1| ----> MYSQL DATA ----> | REMOTE STORAGE | VG1/LV1
|
|---> | REMOTE STORAGE | VG2/LV2 --|
rw |
|
|
ro |
/backupsql/--- |SERVER2| <--|
--
Omer Faruk Sen
http://www.faruk.net
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