Mixture of Toshiba drivers here all enterprise rated, cache 128 - 256MB I have tried turning the write cache on and off a few times across the cluster using hdparm, ever time can see a huge change from on (40ms average) to off (1-3ms average)
Vitaliy what drives are you using? Maybe a particular brand / firmware? On Sun, Nov 11, 2018 at 8:54 PM Marc Roos <m.r...@f1-outsourcing.eu> wrote: > > WD Red here > > > > > > > -----Original Message----- > From: Ashley Merrick [mailto:singap...@amerrick.co.uk] > Sent: zondag 11 november 2018 13:47 > To: Vitaliy Filippov > Cc: Marc Roos; ceph-users > Subject: Re: [ceph-users] Disabling write cache on SATA HDDs reduces > write latency 7 times > > Either more weird then, what drives is in the other cluster? > > On Sun, 11 Nov 2018 at 7:19 PM, Vitaliy Filippov <vita...@yourcmc.ru> > wrote: > > > It seems no, I've just tested it on another small cluster with > HDDs > only - > no change > > > Does it make sense to test disabling this on hdd cluster only? > > -- > With best regards, > Vitaliy Filippov > > > >
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