From: Peter Rabbitson <rabbit@rabbit.us>
To: linux-raid@vger.kernel.org
Subject: Re: XFS sunit/swidth for raid10
Date: Fri, 23 Mar 2007 09:20:32 +0100 [thread overview]
Message-ID: <46038DD0.1060803@rabbit.us> (raw)
In-Reply-To: <Pine.LNX.4.64.0703222347450.9269@twinlark.arctic.org>
dean gaudet wrote:
> On Thu, 22 Mar 2007, Peter Rabbitson wrote:
>
>> dean gaudet wrote:
>>> On Thu, 22 Mar 2007, Peter Rabbitson wrote:
>>>
>>>> Hi,
>>>> How does one determine the XFS sunit and swidth sizes for a software
>>>> raid10
>>>> with 3 copies?
>>> mkfs.xfs uses the GET_ARRAY_INFO ioctl to get the data it needs from
>>> software raid and select an appropriate sunit/swidth...
>>>
>>> although i'm not sure i agree entirely with its choice for raid10:
>> So do I, especially as it makes no checks for the amount of copies (3 in my
>> case, not 2).
>>
>>> it probably doesn't matter.
>> This was essentially my question. For an array -pf3 -c1024 I get swidth = 4 *
>> sunit = 4MiB. Is it about right and does it matter at all?
>
> how many drives?
>
Sorry. 4 drives, 3 far copies (so any 2 drives can fail), 1M chunk.
next prev parent reply other threads:[~2007-03-23 8:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-21 23:23 XFS sunit/swidth for raid10 Peter Rabbitson
2007-03-22 8:23 ` dean gaudet
2007-03-22 12:05 ` Peter Rabbitson
2007-03-23 6:48 ` dean gaudet
2007-03-23 8:20 ` Peter Rabbitson [this message]
2007-03-25 19:16 ` dean gaudet
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