Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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