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From: "Lincoln Dale \(ltd\)" <ltd@cisco.com>
To: "Michael Tokarev" <mjt@tls.msk.ru>, "NeilBrown" <neilb@suse.de>
Cc: <linux-raid@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	"Steinar H. Gunderson" <sgunderson@bigfoot.com>
Subject: RE: [PATCH 000 of 5] md: Introduction
Date: Wed, 18 Jan 2006 05:38:12 +0800	[thread overview]
Message-ID: <26A66BC731DAB741837AF6B2E29C1017D47EA0@xmb-hkg-413.apac.cisco.com> (raw)

> Neil, is this online resizing/reshaping really needed?  I understand
> all those words means alot for marketing persons - zero downtime,
> online resizing etc, but it is much safer and easier to do that stuff
> 'offline', on an inactive array, like raidreconf does - safer, easier,
> faster, and one have more possibilities for more complex changes.  It
> isn't like you want to add/remove drives to/from your arrays every
day...
> Alot of good hw raid cards are unable to perform such reshaping too.

RAID resize/restripe may not be so common with cheap / PC-based RAID
systems, but it is common with midrange and enterprise storage
subsystems from vendors such as EMC, HDS, IBM & HP.
in fact, I'd say it's the exception to the rule _if_ an
midrange/enterprise storage subsystem doesn't have an _online_ resize
capability..

personally, I think this this useful functionality, but my personal
preference is that this would be in DM/LVM2 rather than MD.  but given
Neil is the MD author/maintainer, I can see why he'd prefer to do it in
MD. :)


cheers,

lincoln.

             reply	other threads:[~2006-01-17 21:38 UTC|newest]

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-01-17 21:38 Lincoln Dale (ltd) [this message]
2006-01-18 13:27 ` [PATCH 000 of 5] md: Introduction Jan Engelhardt
2006-01-18 23:19   ` Neil Brown
2006-01-19 15:33     ` Mark Hahn
2006-01-19 20:12     ` Jan Engelhardt
2006-01-19 21:22       ` Lars Marowsky-Bree
2006-01-19 22:17     ` Phillip Susi
2006-01-19 22:32       ` Neil Brown
2006-01-19 23:26         ` Phillip Susi
2006-01-19 23:43           ` Neil Brown
2006-01-20  2:17             ` Phillip Susi
2006-01-20 10:53               ` Lars Marowsky-Bree
2006-01-20 12:06                 ` Jens Axboe
2006-01-20 18:38                 ` Heinz Mauelshagen
2006-01-20 22:09                   ` Lars Marowsky-Bree
2006-01-21  0:06                     ` Heinz Mauelshagen
2006-01-20 18:41               ` Heinz Mauelshagen
2006-01-20 17:29             ` Ross Vandegrift
2006-01-20 18:36             ` Heinz Mauelshagen
2006-01-20 22:57               ` Lars Marowsky-Bree
2006-01-21  0:01                 ` Heinz Mauelshagen
2006-01-21  0:03                   ` Lars Marowsky-Bree
2006-01-21  0:08                     ` Heinz Mauelshagen
2006-01-21  0:13                       ` Lars Marowsky-Bree
2006-01-23  9:44                         ` Heinz Mauelshagen
2006-01-23 10:26                           ` Lars Marowsky-Bree
2006-01-23 10:38                             ` Heinz Mauelshagen
2006-01-23 10:45                               ` Lars Marowsky-Bree
2006-01-23 11:00                                 ` Heinz Mauelshagen
2006-01-23 12:54                           ` Ville Herva
2006-01-23 13:00                             ` Steinar H. Gunderson
2006-01-23 13:54                             ` Heinz Mauelshagen
2006-01-23 17:33                               ` Ville Herva
2006-01-24  2:02                             ` Phillip Susi
2006-01-24  7:26                               ` Error message for invalid initramfs cpio format? Ville Herva
  -- strict thread matches above, loose matches on Subject: below --
2006-01-20 18:05 [PATCH 000 of 5] md: Introduction Hubert Tonneau
2006-01-20 17:01 Hubert Tonneau
2006-01-20 16:15 ` Christoph Hellwig
2006-01-22  6:45   ` Herbert Poetzl
2006-01-20 16:48 Hubert Tonneau
2006-01-17  6:56 NeilBrown
2006-01-17  8:17 ` Michael Tokarev
2006-01-17  9:50   ` Sander
2006-01-17 11:26     ` Michael Tokarev
2006-01-17 14:03       ` Kyle Moffett
2006-01-19  0:28         ` Neil Brown
2006-01-17 16:08       ` Ross Vandegrift
2006-01-17 18:12         ` Michael Tokarev
2006-01-18  8:14           ` Sander
2006-01-18  9:03             ` Alan Cox
2006-01-19  0:22           ` Neil Brown
2006-01-19  9:01             ` Jakob Oestergaard
2006-01-17 22:38       ` Phillip Susi
2006-01-17 22:57         ` Neil Brown
2006-01-17 14:10   ` Steinar H. Gunderson
2006-01-22  4:42 ` Adam Kropelin
2006-01-22 22:52   ` Neil Brown
2006-01-23 23:02     ` Adam Kropelin
2006-01-23  1:08 ` John Hendrikx
2006-01-23  1:25   ` Neil Brown
2006-01-23  1:54     ` Kyle Moffett

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