Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
I check the Network link too, because some times the network are the real problem. Did you test the network interface?. Did you change the the protocol to A for example.. and make more test. In my experience the SSD disk has problems for broken. http://www.codinghorror.com/blog/2011/05/the-hot-crazy-solid-state-drive-scale.html What configuration are you creating? Active/active, Active/passive? What filesystem? regards! On Sun, Jan 1, 2012 at 6:04 PM, François Delpierre <francois.delpierre at pivert.org> wrote: > Hi, > > 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. > > After setting up the replication (Protocol C), I had catastrophic > performances, ( dropping to 30 IOPS after 60s of random writes ). > > 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. > > 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. > > I created 2 partitions on my SSD : > - 128MB for external meta-disk of my slow SATA partition (750GB) > - 240GB for a second DRBD resource, with internal meta-disk. > > My questions : > - Is there some recommendations on a SSD setup ? > - Why is the external meta-disk that few documented ? I spent more than 1 > hour to find the syntax of the directive : > > meta-disk > /dev/disk/by-id/scsi-SATA_MKNSSDCR240GB_MKN1146A0000032XXX-part1[0]; > > And it's not clear to my what is the [0] at the end ? > > Regards, > > François Delpierre > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user >