On Tue, Aug 8, 2017 at 9:16 AM, Fabrice Bacchella < fabrice.bacche...@orange.fr> wrote:
> > > Le 8 août 2017 à 04:08, FERNANDO FREDIANI <fernando.fredi...@upx.com> a > écrit : > > > Even if you have a Hardware RAID Controller with Writeback cache you > will have a significant performance penalty and may not fully use all the > resources you mentioned you have. > > > > Nope again,from my experience with HP Smart Array and write back cache, > write, that goes in the cache, are even faster that read that must goes to > the disks. of course if the write are too fast and to big, they will over > overflow the cache. But on todays controller they are multi-gigabyte cache, > you must write a lot to fill them. And if you can afford 40Gb card, you can > afford decent controller. > The last sentence raises an excellent point: balance your resources. Don't spend a fortune on one component while another will end up being your bottleneck. Storage is usually the slowest link in the chain. I personally believe that spending the money on NVMe drives makes more sense than 40Gb (except [1], which is suspiciously cheap!) Y. [1] http://a.co/4hsCTqG > > > _______________________________________________ > Users mailing list > Users@ovirt.org > http://lists.ovirt.org/mailman/listinfo/users >
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