On Fri, September 8, 2017 9:48 am, hw wrote: > 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. Could someone, please, elaborate on the statement that "SSDs are not suitable for hardware RAID". Thanks. Valeri > > It remains to be tested how the hardware RAID performs, which may be even > better than the SSDs. > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++