I've deployed DRBD on HP DL360's and DL380's. I've used internal meta w/o any noticeable loss of performance. The typical setup is usually (4) 72GB 15K SFF SAS drives in a RAID-10 or RAID-5 for DRBD. Array -> LVM -> DRBD -> file system. In all cases, there is at least 256MB of cache on the controller and the BBWC is installed and write-cache enabled. Drive-level cache is disabled of course. Sequential write throughput is better than 150MBps native so the bottleneck becomes the 1Gbps xover link between the boxes -- which is fine for these environments.<br>
<br>- Chris<br>