Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, I am currently designing a replacement to our MailDir email storage. We have decided to go with 2 storage servers, replicated using DRBD. What I want to know is the IOPS penalty DRBD will introduce. I have measured the IOPS currently hitting our current servers, and used a std dev of this to determine the IOPS I need the new servers to be able to handle. I have calculated the read and write percentage and multiplied the write percentage by 2 (as we are using RAID 10 on the new servers). I failed to take into account DRBD with these calculations and so need to redo them. RAID 10 has a "penalty" of 2, so it was pretty easy to multiply the write percentage of IOPS by 2. Is there a similar equation for DRBD to work out how many extra IOPS my server has to process in order to meet the current workload of the current servers? Thanks in Advance