Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, don't have a 1Gb network??? you "need" a 1GB network at least because the 100 is veryyyyy slow... for a speed configuration... Now I have a Active-Active (what filesystem are you using? ocfs2??), If you send me the test that you make I can run in my own server... (somthink ease, please :) ). On Wed, Jan 4, 2012 at 1:18 PM, François Delpierre <francois.delpierre at pivert.org> wrote: > I noticed I did not reply to the list. So, here is the copy : > > Hi Eduardo, > > When I had these horrible performances I was not in a good situations : > - One 2GB disk SSD 7200RPM per node. > - DRBD 8.3, Protocol C, Active-Active > - 2 Network interfaces on a 100Mbits network switch. > > Now that I added the SSDs, I'll test again. I'm currently looking on how to > test. > As I'm not interested in testing my OS cache, I'll reduce the memory to 1GB > or less (with the mem=1024M kernel boot option), Install an ubuntu VM with > 512MRam and PV disk drivers, and run either bonnie++ or iozone in these 4 > conditions : > - Local SSD > - DRBD SSD in Active-Active > - Local SATA > - DRBD Sata in Active-Active (but with the meta-disk on SSD). (Where I was > getting 30IOPS with bonnie++ in my VM before I moved meta-disk to SSD) > > Regards, > > François Delpierre > > ________________________________ > De: "Eduardo Diaz - Gmail" <ediazrod at gmail.com> > À: "François Delpierre" <francois.delpierre at pivert.org> > Cc: drbd-user at lists.linbit.com > Envoyé: Mardi 3 Janvier 2012 14:19:39 > Objet: Re: [DRBD-user] drbd performance issue on SATA > > 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 >> > > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user >