Hello,
I am wondering about an optimal DRBD configuration. Currently I have got
two identical servers containing two HDDs each for data. Two HDDs are in
RAID 1 (md127). These two md127 are mirrored using drbd. it works
perfectly but I am wondering about its performance. Since RAID 1
decreseses write performence having two RAID1 (mdadm and drbd) must
decrese write performance even more. Say It makes around aprox 20 IOPS
from 4x 75IOPS SATA 7200rpm HDDs? Am I right? If that is true is there a
way out of there?
I was wondering if it is viable to use only one RAID1. I would use DRBD
for RAID 1 between two servers, hence from these 4 HDDs I would make
RAID 10 where RAID 1 is created using DRBD and RAID 0 using mdadm..
However there is a thing I am not sure about. What happens I one disk
failes? Is it same for drbd as for mdadm? I just replace HDD and
everything runs smoothly forward? What if I need to reboot system meanwhile?
Thanks for answers,
Milos
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