m.roth at 5-cent.us wrote: > hw wrote: >> Mark Haney wrote: > <snip> >>> BTRFS isn't going to impact I/O any more significantly than, say, XFS. >> >> But mdadm does, the impact is severe. I know there are ppl saying >> otherwise, but I´ve seen the impact myself, and I definitely don´t want >> it on that particular server because it would likely interfere with >> other services. > <snip> > I haven't really been following this thread, but if your requirements are > that heavy, you're past the point that you need to spring some money and > buy hardware RAID cards, like LSI, er, Avago, I mean, who's bought them > more recently? Heavy requirements are not required for the impact of md-RAID to be noticeable. Hardware RAID is already in place, but the SSDs are "extra" and, as I said, not suited to be used with hardware RAID. It remains to be tested how the hardware RAID performs, which may be even better than the SSDs.