[DRBD-user] drbd performance issue on SATA

Eduardo Diaz - Gmail ediazrod at gmail.com
Tue Jan 3 14:19:39 CET 2012

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
>
>
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