That's a great example of what I worry about. On my first server I bought 4 identical drives when I built it and then when I needed more space I again bought 4 identical larger drives. Since this was all on RAID5 the risk was actually pretty high. On my second server I bought two of each manufacturer and used RAID6 so now I can survive a whole batch going wrong at the same time. Next time I need to build one from scratch I may even go for 4 different drives (mixing red/green/etc).
What I am doing now as soon as I get unrecoverable errors from the drives is to replace them one at a time with whatever is the best cost/TB drive. Whenever all the drives have been upgraded I can resize the array to the new minimum drive size.
What I am doing now as soon as I get unrecoverable errors from the drives is to replace them one at a time with whatever is the best cost/TB drive. Whenever all the drives have been upgraded I can resize the array to the new minimum drive size.