Date: Fri, 20 Feb 2015 11:38:48 +0000 From: Tom Evans <tevans.uk@googlemail.com> To: Dr Josef Karthauser <joe@tao.org.uk> Cc: FreeBSD Stable <stable@freebsd.org> Subject: Re: ada drives keep timing out! Message-ID: <CAFHbX1JY1xysM8vUo8_asS_DroEMx4UDwm%2BkmNBHuZGJ1yLRBQ@mail.gmail.com> In-Reply-To: <1BFD18FF-D3A7-4230-9425-CEDC7DC94181@tao.org.uk> References: <064CF905-DF19-40A7-8CE8-D9FFE17913EE@tao.org.uk> <938BC03E-2C47-4381-9D21-5849E9E6E126@gid.co.uk> <1BFD18FF-D3A7-4230-9425-CEDC7DC94181@tao.org.uk>
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On Fri, Feb 20, 2015 at 11:21 AM, Dr Josef Karthauser <joe@tao.org.uk> wrot= e: > In this case other report no such issues on the same hardware running Lin= ux, so it seems to me to be an internal timeout issue within FreeBSD, or ma= ybe Linux retries more than FreeBSD and so doesn=E2=80=99t experience the i= ssue that we do. It=E2=80=99s clear that FreeBSD is proactively disconnecti= ng the drive when the timeout occurs. So, maybe there=E2=80=99s something t= hat can be done there. Linux has more automatic quirks for troublesome hardware, it may also have a longer default timeout. FreeBSD's WD green drives are green, they spin down frequently if idle. If you then try and use them, they can take considerably longer than the timeout to spin back up and be ready, and the kernel gives up. You can make the WD green drives less green by using a dos tool, wdidle3.exe. Google will tell you more (and show that WD green drives cause people problems on all OS when they use them in RAID). The continual parking/unparking considerably reduces the life of disk. You can tell BSD to wait longer with a higher "kern.cam.ada.default_timeout= ". Cheers Tom
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