Date: Fri, 18 Jan 2013 13:34:13 -0700 From: Ian Lepore <ian@FreeBSD.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: Scott Long <scott4long@yahoo.com>, "freebsd-hackers@freebsd.org" <freebsd-hackers@FreeBSD.org>, Dieter BSD <dieterbsd@gmail.com>, "scottl@FreeBSD.org" <scottl@FreeBSD.org>, "gibbs@FreeBSD.org" <gibbs@FreeBSD.org>, "mjacob@FreeBSD.org" <mjacob@FreeBSD.org> Subject: Re: IBM blade server abysmal disk write performances Message-ID: <1358541253.32417.248.camel@revolution.hippie.lan> In-Reply-To: <alpine.BSF.2.00.1301182035200.13066@wojtek.tensor.gdynia.pl> References: <CAA3ZYrCgMmGi3EHKEuXb=qWPjC2zSMYcfgZ6nh-ipqQ7dAeVdA@mail.gmail.com> <1358529778.71931.YahooMailNeo@web120304.mail.ne1.yahoo.com> <alpine.BSF.2.00.1301181909250.12638@wojtek.tensor.gdynia.pl> <1358533136.41693.YahooMailNeo@web120302.mail.ne1.yahoo.com> <alpine.BSF.2.00.1301182035200.13066@wojtek.tensor.gdynia.pl>
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On Fri, 2013-01-18 at 20:37 +0100, Wojciech Puchar wrote:
> >> disk would write data
> >>
> >
> > I suspect that I'm encountering situations right now at netflix where this advice is not true. I have drives that are seeing intermittent errors, then being forced into reset after a timeout, and then coming back up with filesystem problems. It's only a suspicion at this point, not a confirmed case.
> true. I just assumed that anywhere it matters one would use gmirror.
> As for myself - i always prefer to put different manufacturers drives for
> gmirror or at least - not manufactured at similar time.
>
That is good advice. I bought six 1TB drives at the same time a few
years ago and received drives with consequtive serial numbers. They
were all part of the same array, and they all failed ("click of death")
within a six hour timespan of each other. Luckily I noticed the
clicking right away and was able to get all the data copied to another
array within a few hours, before they all died.
-- Ian
> 2 fails at the same moment is rather unlikely. Of course - everything is
> possible so i do proper backups to remote sites. Remote means another
> city.
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