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List: evms-devel
Subject: Ang: Re: [Evms-devel] RAID 5+0 support
From: johan () capvert ! se
Date: 2006-01-20 9:27:20
Message-ID: OF20C8981A.BBEF6DF1-ONC12570FC.0035243E () capvert ! ins
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Hi!
Something important you need to consider when creating RAID-50 arrays is
that you can´t crash an entire RAID5-set in the RAID50-array. If you do,
you will crash the entire array. Which leads you to some considerations
like NOT expanding the RAID50 array to more than one box(jbod), since it
will get vulnerable for cable or power loss.
Best regards from/Med vänliga hälsningar från
Johan Kragsterman
http://www.capvert.se
Steve Dobbelstein <steved@us.ibm.com>
Sänt av: evms-devel-admin@lists.sourceforge.net
2006-01-19 20:41
Till: govind raj <agovinda04@hotmail.com>
Kopia: evms-devel@lists.sourceforge.net
Ärende: Re: [Evms-devel] RAID 5+0 support
"Steinar H. Gunderson" <sgunderson@bigfoot.com> wrote on 01/19/2006
01:23:50 PM:
> On Thu, Jan 19, 2006 at 10:22:26PM +0530, govind raj wrote:
> > We find that kernel modules are available for RAID0, 1, 5, 1+0 as part
of
> > this kernel. But however, we do not find a similar module available
for
> > RAID 5+0. Can someone advise us of how we would be able to get this
support
> > added into the kernel? If this is not required as a kernel module, how
do
> > we create a RAID 5+0 using MD?
>
> Make your RAID-0 devices. Make a RAID-5 of the resulting devices.
>
> Or the other way round, I can never remember :-)
You would probably want to create your RAID 5 arrays first so that the
fault handling of RAID 5 is as close to the disks as possible. Then make
a
RAID 0 array out of the RAID 5 arrays to create the large array that you
want.
Steve D.
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<br><font size=2 face="sans-serif"> \
\
Hi! \
\
<br> <br>
Something important you need to consider when creating RAID-50 arrays is that you \
can´t crash an entire RAID5-set in the RAID50-array. If you do, you will crash \
the entire array. Which leads you to some considerations like NOT expanding the \
RAID50 array to more than one box(jbod), since it will get vulnerable for cable or \
power loss.<br> <br>
Best regards from/Med vänliga \
hälsningar från<br> <br>
\
Johan Kragsterman<br> <br>
\
http://www.capvert.se</font> <br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td>
<td><font size=1 face="sans-serif"><b>Steve Dobbelstein \
<steved@us.ibm.com></b></font> <br><font size=1 face="sans-serif">Sänt av: \
evms-devel-admin@lists.sourceforge.net</font> <p><font size=1 \
face="sans-serif">2006-01-19 20:41</font> <br>
<td><font size=1 face="Arial"> </font>
<br><font size=1 face="sans-serif"> Till: \
govind raj <agovinda04@hotmail.com></font> <br><font size=1 \
face="sans-serif"> Kopia: \
evms-devel@lists.sourceforge.net</font> <br><font size=1 \
face="sans-serif"> Ärende: Re: \
[Evms-devel] RAID 5+0 support</font></table> <br>
<br>
<br><font size=2 face="Courier New">"Steinar H. Gunderson" \
<sgunderson@bigfoot.com> wrote on 01/19/2006<br> 01:23:50 PM:<br>
<br>
> On Thu, Jan 19, 2006 at 10:22:26PM +0530, govind raj wrote:<br>
> > We find that kernel modules are available for RAID0, 1, 5, 1+0 as part<br>
of<br>
> > this kernel. But however, we do not find a similar module available for<br>
<br>
> > RAID 5+0. Can someone advise us of how we would be able to get this<br>
support<br>
> > added into the kernel? If this is not required as a kernel module, how<br>
do<br>
> > we create a RAID 5+0 using MD?<br>
><br>
> Make your RAID-0 devices. Make a RAID-5 of the resulting devices.<br>
><br>
> Or the other way round, I can never remember :-)<br>
<br>
You would probably want to create your RAID 5 arrays first so that the<br>
fault handling of RAID 5 is as close to the disks as possible. Then make a<br>
RAID 0 array out of the RAID 5 arrays to create the large array that you<br>
want.<br>
<br>
Steve D.<br>
<br>
<br>
<br>
-------------------------------------------------------<br>
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files<br>
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_______________________________________________<br>
Evms-devel mailing list<br>
Evms-devel@lists.sourceforge.net<br>
To subscribe/unsubscribe, please visit:<br>
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</font>
<br>
<br>
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