From: Wols Lists <antlists@youngman.org.uk>
To: "Boylan, Ross" <Ross.Boylan@ucsf.edu>,
"linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>
Subject: Re: sector size mismatch a problem for RAID 1?
Date: Fri, 3 Feb 2017 11:20:17 +0000 [thread overview]
Message-ID: <58946771.4030005@youngman.org.uk> (raw)
In-Reply-To: <d05e3579-38c4-40bd-8fb4-d296fc3ea9c5@EXHT02.net.ucsf.edu>
On 03/02/17 06:18, Boylan, Ross wrote:
> When I moved the new disk to an internal drive bay (after reading lvm-raid wiki's statements that RAID shouldn't be used over a USB link) the problems went away--at least so far.
>
As I understand it, the problem is that the USB interface goes to sleep.
So when you try to write to it, it may not wake up quick enough, causing
havoc ...
> I wonder if this is the source of my original problem: I was using a single disk RAID1 where the single disk had a USB connection. However, I did get a failure off that drive doing a dd off the raw device.
>
Quite likely. But I'm puzzled as to why the dd would fail, as this would
keep the USB interface active. Maybe others who know more will chime in
and explain.
>
> Ross
Cheers,
Wol
prev parent reply other threads:[~2017-02-03 11:20 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-03 0:17 sector size mismatch a problem for RAID 1? Boylan, Ross
2017-02-03 6:18 ` Boylan, Ross
2017-02-03 11:20 ` Wols Lists [this message]
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