Hi all, I have a pair of new servers, each with 6x300GB 15K SAS drives configured as a 1.1TB (usable) RAID5 array. The servers will be a heartbeat+DRBD active/active cluster, with one server primary for MySQL and the other server primary for FTP. My old servers have about 60GB of MySQL data and 140GB of FTP files. On the new servers, DRBD will ride on top of LVM. I want to allocate 200GB for MySQL data as LV01 and 400GB for FTP data as LV02, leaving about 500GB unallocated and available for future needs. Here are my questions: 1. If I start LV01 at 200GB and LV02 at 400GB, and then later I grow LV01 by another 200GB, would it be fair to expect performance issues due to the separation of LV01's PVs on the disk platters? Would it be better to allocate the maximum expected size up front? 2. Does DRBD care if, when, or how its backing devices are grown? Can I issue an lvextend command on an LVM that is being used by DRBD without expecting any problems?
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