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From: John Rowe <rowe@excc.ex.ac.uk>
To: linux-raid@vger.kernel.org
Subject: Two-disk RAID5?
Date: Wed, 26 Apr 2006 17:41:47 +0100	[thread overview]
Message-ID: <1146069707.10253.50.camel@kenny> (raw)

I'm about to create a RAID1 file system and a strange thought occurs to
me: if I create a two-disk RAID5 array then I can grow it later by the
simple expedient of adding a third disk and hence doubling its size.

Is there any real down-side to this, such as performance? Alternatively
is it likely that mdadm will soon be able to convert a RAID1 pair to
RAID5 any time soon? (Just how different are they anyway? Isn't the
RAID4/5 checksum just an OR?)

Thanks

John



             reply	other threads:[~2006-04-26 16:41 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-04-26 16:41 John Rowe [this message]
2006-04-26 17:18 ` Two-disk RAID5? Jon Lewis
2006-04-26 18:46   ` Tuomas Leikola
2006-05-05  1:22 ` Bill Davidsen
  -- strict thread matches above, loose matches on Subject: below --
2006-04-26 18:58 Jansen, Frank
2006-04-26 19:22 ` Jon Lewis
2006-04-26 22:53   ` Neil Brown
2006-04-27  4:15     ` Al Boldi
2006-05-01 17:11   ` Erik Mouw
2006-05-05  1:18     ` Bill Davidsen
2006-05-05  9:31       ` John Rowe
2006-05-05 10:03         ` Neil Brown
2006-05-05 10:24       ` Erik Mouw

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