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.Roos@xxxxxxxxxxxxxxxxx> wrote:
WD Red here
-----Original Message-----
From: Ashley Merrick [mailto:singapore@xxxxxxxxxxxxxx]
Sent: zondag 11 november 2018 13:47
To: Vitaliy Filippov
Cc: Marc Roos; ceph-users
Subject: Re: 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 <vitalif@xxxxxxxxxx>
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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