Date: Tue, 21 May 2019 11:54:09 -0300 From: =?UTF-8?Q?Josias_L=2E_Gon=C3=A7alves?= <josiaslg@bsd.com.br> To: freebsd-stable@freebsd.org Subject: mdconfig and the [no]async option Message-ID: <CANgqCK-2=Twb1OrOinpEHAy3CosAUrS%2BZ6hGGyq6AvSvbt=KGw@mail.gmail.com>
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Hi.
I'm testing md devices with zfs and i see a slow performance on md0 and md1
(md1 by network).
Reading in man, i have the noasync option to up performance but the warning:
For vnode backed devices: avoid IO_SYNC for increased
performance but at the risk of deadlocking the entire
kernel.
So, can the operating system freeze if some write or read block fail ?.
Best Regards.
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