I have a few questions concerning LVM mirror implementation, and I couldn't find any suitable design doc
I need to setup a dual site ( a few miles between the 2 sites, around 1 ms RTD) mirror based cluster system.
- what is the default behaviour of the mirroring, writing in parallel to both mirror legs or serialized ? what about read requests ?
- for write requests, is the ack returned to the application (thru VFS) when the 2 legs are updated or only when the first is updated ?
- Is there a way to control it ?
- what happens if the log device is lost ?
I saw a post about LVM mirror vs mdadm where it is about the location of the mirror log (https://www.redhat.com/archives/linux-lvm/2009-July/msg00012.html) someone gave the answer that when creating the LV's with --alloc anywhere it will auto locate the log on any of the PV's.
According to what I could read, the --alloc doesn't intend for that, am I right ?
Brem ,
_______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
