Hi! "oflag=sync" or in some cases "direct,sync" avoid any cache usage. ----- Original Message ----- > From: "Vitaliy Filippov" <vitalif@xxxxxxxxxx> > To: "Fyodor Ustinov" <ufm@xxxxxx> > Cc: "EDH - Manuel Rios Fernandez" <mriosfer@xxxxxxxxxxxxxxxx>, "ceph-users" <ceph-users@xxxxxxx> > Sent: Wednesday, 4 September, 2019 13:38:44 > Subject: Re: Re: Strange hardware behavior > Still, please don't :) > > At least drop_caches before testing. > >> Hi! >> >> In this case, using dd is quite acceptable. >> >> ----- Original Message ----- >>> From: vitalif@xxxxxxxxxx >>> To: "Fyodor Ustinov" <ufm@xxxxxx> >>> Cc: "EDH - Manuel Rios Fernandez" <mriosfer@xxxxxxxxxxxxxxxx>, >>> "ceph-users" <ceph-users@xxxxxxx> >>> Sent: Tuesday, 3 September, 2019 15:18:23 >>> Subject: Re: Re: Strange hardware behavior >> >>> Please never use dd for disk benchmarks. >>> >>> Use fio. For linear write: >>> >>> fio -ioengine=libaio -direct=1 -invalidate=1 -name=test -bs=4M >>> -iodepth=32 -rw=write -runtime=60 -filename=/dev/sdX > > > -- > With best regards, > Vitaliy Filippov _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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