linux-kernel - RE: Software raid0 will crash the file-system, when each disk is 5TB

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Message-ID: <Pine.LNX.4.61.0705171724500.3231@yvahk01.tjqt.qr>
Date:	Thu, 17 May 2007 17:30:26 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Neil Brown <neilb@...e.de>
cc:	Jeff Zheng <Jeff.Zheng@...ace.com>, david@...g.hm,
	Andreas Dilger <adilger@...sterfs.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: RE: Software raid0 will crash the file-system, when each disk is
 5TB


On May 17 2007 21:11, Neil Brown wrote:
>On Thursday May 17, jengelh@...ux01.gwdg.de wrote:
>> XOR it (0^0=1), and hence fills up the host disk.
>
>Uhmm... you need to check your maths.
>
>$ perl -e 'printf "%d\n", 0^0;'
>0
>
>:-)

(ouch)
You know just as I that ^ is the power operator!
I just... wrongly named it XOR :p

$ echo '0^0' | bc -l
1


Well, right, setting up a blank raid5 array inside vmware will not make
the host file significantly larger, making it easy to build megatera
arrays with gigabyte range host disks.


	Jan
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