<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'>Hi,<br><br>I'm building a very low cost virtualization server for a Non Profit organization using 2 HP workstations (500€ each) (8GB Ram, 1.5TB, QuadCore AMD), Software Proxmox and DRBD for the data replication with dedicated gigabit & cross cable for the replication.<br><br>After setting up the replication (Protocol C), I had catastrophic performances, ( dropping to 30 IOPS after 60s of random writes ).<br><br>I also found a lot of reading, not fully explaining my terrific 30 IOPS on 7200RPM drives, but clearly pointing the necessity to have a battery backed up cache controller to sustain random writes generated by the meta-disk.<br><br>As the hardware makrket did change quite a lot recently, especially towards SSD, I immediately realized that 240GB SSD are half price than a small raid controller, a battery for the cache, and 2 small disks with reasonable performances (10rpm). So, I choose SSD.<br><br>I created 2 partitions on my SSD :<br>- 128MB for external meta-disk of my slow SATA partition (750GB)<br>- 240GB for a second DRBD resource, with internal meta-disk.<br><br>My questions :<br>- Is there some recommendations on a SSD setup ?<br>- Why is the external meta-disk that few documented ? I spent more than 1 hour to find the syntax of the directive :<br><br>meta-disk /dev/disk/by-id/scsi-SATA_MKNSSDCR240GB_MKN1146A0000032XXX-part1[0];<br><br>And it's not clear to my what is the [0] at the end ?<br><br>Regards,<br><span><br><span name="x"></span>François Delpierre<span name="x"></span><br></span><br></div></body></html>