Re: [PATCH -mm 0/4] raid5: stripe_queue (+20% to +90% write performance)

2007-10-09 Thread Neil Brown
On Saturday October 6, [EMAIL PROTECTED] wrote: Neil, Here is the latest spin of the 'stripe_queue' implementation. Thanks to raid6+bitmap testing done by Mr. James W. Laferriere there have been several cleanups and fixes since the last release. Also, the changes are now spread over 4

Re: very degraded RAID5, or increasing capacity by adding discs

2007-10-09 Thread Michael Tokarev
Neil Brown wrote: On Tuesday October 9, [EMAIL PROTECTED] wrote: [] o During this reshape time, errors may be fatal to the whole array - while mdadm do have a sense of critical section, but the whole procedure isn't as much tested as the rest of raid code, I for one will not rely on it,

[no subject]

2007-10-09 Thread Frédéric Mantegazza
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Raid5 growing problem

2007-10-09 Thread nagilum
Hi, I had a power failure during a RAID5 reshape. I added two drives to an existing RAID5 of three drives. After the machine came back up (on a rescue disk) I thought I'd simply have to go through the process again. So I use add add the new disk again. Although that worked, I am now unable to

Re: very degraded RAID5, or increasing capacity by adding discs

2007-10-09 Thread Janek Kozicki
Michael Tokarev said: (by the date of Tue, 09 Oct 2007 02:52:06 +0400) Janek Kozicki wrote: Hello, Recently I started to use mdadm and I'm very impressed by its capabilities. I have raid0 (250+250 GB) on my workstation. And I want to have raid5 (4*500 = 1500 GB) on my backup

Re: very degraded RAID5, or increasing capacity by adding discs

2007-10-09 Thread Janek Kozicki
Neil Brown said: (by the date of Tue, 9 Oct 2007 13:32:09 +1000) On Tuesday October 9, [EMAIL PROTECTED] wrote: Problems at step 4.: 'man mdadm' doesn't tell if it's possible to grow an array to a degraded array (non existant disc). Is it possible? Why not experiment with loop

Re: very degraded RAID5, or increasing capacity by adding discs

2007-10-09 Thread Mr. James W. Laferriere
Hello Neil , On Tue, 9 Oct 2007, Neil Brown wrote: On Tuesday October 9, [EMAIL PROTECTED] wrote: Problems at step 4.: 'man mdadm' doesn't tell if it's possible to grow an array to a degraded array (non existant disc). Is it possible? Why not experiment with loop devices on files

Help RAID5 reshape Oops / backup-file

2007-10-09 Thread Nagilum
Hi, During the process of reshaping a Raid5 from 3 (/dev/sd[a-c]) to 5 devices (/dev/sd[a-e]) the system was accidentally shut down. I know I was stupid I should have used a --backup-file but stupid me didn't. Thanks for not rubbing it any further. :( Ok, here is what I have: nas:~# uname -a

Re: very degraded RAID5, or increasing capacity by adding discs

2007-10-09 Thread Neil Brown
On Tuesday October 9, [EMAIL PROTECTED] wrote: Hello Neil , On Tue, 9 Oct 2007, Neil Brown wrote: On Tuesday October 9, [EMAIL PROTECTED] wrote: Problems at step 4.: 'man mdadm' doesn't tell if it's possible to grow an array to a degraded array (non existant disc). Is it

Re: [PATCH -mm 0/4] raid5: stripe_queue (+20% to +90% write performance)

2007-10-09 Thread Dan Williams
On Mon, 2007-10-08 at 23:21 -0700, Neil Brown wrote: On Saturday October 6, [EMAIL PROTECTED] wrote: Neil, Here is the latest spin of the 'stripe_queue' implementation. Thanks to raid6+bitmap testing done by Mr. James W. Laferriere there have been several cleanups and fixes since the