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From: David Waite <david@alkaline-solutions.com>
To: Phil Turmel <philip@turmel.org>
Cc: linux-raid@vger.kernel.org
Subject: Re: Unable to (un)-grow raid6
Date: Sun, 6 Dec 2015 14:13:22 -0700	[thread overview]
Message-ID: <9F08EE4D-B926-4F8F-9F9D-F9C7234959B4@alkaline-solutions.com> (raw)
In-Reply-To: <56649C04.9000601@turmel.org>


> On Dec 6, 2015, at 1:35 PM, Phil Turmel <philip@turmel.org> wrote:
> 
> On 12/05/2015 10:04 PM, David Waite wrote:
>> I’m having difficulty shrinking down a RAID6 array (md2) on a Sinology NAS. I wish to go from 13 drives to 11, and believe I need to go to 12 first to maintain operation and redundancy through the resizing process.
> 
> No, you can go straight to 11 if you've set array-size properly.  --grow
> operations maintain redundancy throughout.

I thought —grow maintains redundancy for power loss but not disk failure.

Would I do this by simply marking the other drive I want to remove as failed?

I’ll try —array-size again. How is the array-size suggestion by mdadm calculated - the drives are not of uniform size.

-DW--
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  reply	other threads:[~2015-12-06 21:13 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <4E26C335-DEDB-489E-B54E-A285273569A1@alkaline-solutions.com>
2015-12-06  3:04 ` Unable to (un)-grow raid6 David Waite
2015-12-06 20:35   ` Phil Turmel
2015-12-06 21:13     ` David Waite [this message]
2015-12-06 21:21       ` Phil Turmel
     [not found]         ` <BACF203A-3817-4F24-88B0-38713D9459D9@alkaline-solutions.com>
     [not found]           ` <5664D042.9080401@turmel.org>
     [not found]             ` <10980501-F73B-4A63-AF7D-D7100C9C6B72@alkaline-solutions.com>
2015-12-09  3:12               ` Phil Turmel

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