Hi! "oflag=sync" or in some cases "direct,sync" avoid any cache usage. ----- Original Message -----
From: "Vitaliy Filippov" <vitalif@yourcmc.ru> To: "Fyodor Ustinov" <ufm@ufm.su> Cc: "EDH - Manuel Rios Fernandez" <mriosfer@easydatahost.com>, "ceph-users" <ceph-users@ceph.io> Sent: Wednesday, 4 September, 2019 13:38:44 Subject: Re: [ceph-users] 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@yourcmc.ru To: "Fyodor Ustinov" <ufm@ufm.su> Cc: "EDH - Manuel Rios Fernandez" <mriosfer@easydatahost.com>, "ceph-users" <ceph-users@ceph.io> Sent: Tuesday, 3 September, 2019 15:18:23 Subject: Re: [ceph-users] 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