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From: Goffredo Baroncelli <kreijack@libero.it>
To: Steven Davies <btrfs-list@steev.me.uk>,
	Zygo Blaxell <ce3g8jdj@umail.furryterror.org>,
	John Petrini <john.d.petrini@gmail.com>
Cc: John Petrini <me@johnpetrini.com>, linux-btrfs@vger.kernel.org
Subject: Re: Filesystem Went Read Only During Raid-10 to Raid-6 Data Conversion
Date: Mon, 20 Jul 2020 19:57:49 +0200	[thread overview]
Message-ID: <507b649c-ac60-0b5c-222f-192943c50f16@libero.it> (raw)
In-Reply-To: <de9a3d52-0147-255c-4c39-09bf734e1435@steev.me.uk>

On 7/18/20 12:36 PM, Steven Davies wrote:
> On 17/07/2020 06:57, Zygo Blaxell wrote:
>> On Thu, Jul 16, 2020 at 09:11:17PM -0400, John Petrini wrote:
> 
> --snip--
> 
>>> /dev/sdf, ID: 12
>>>     Device size:             9.10TiB
>>>     Device slack:              0.00B
>>>     Data,RAID10:           784.31GiB
>>>     Data,RAID10:             4.01TiB
>>>     Data,RAID10:             3.34TiB
>>>     Data,RAID6:            458.56GiB
>>>     Data,RAID6:            144.07GiB
>>>     Data,RAID6:            293.03GiB
>>>     Metadata,RAID10:         4.47GiB
>>>     Metadata,RAID10:       352.00MiB
>>>     Metadata,RAID10:         6.00GiB
>>>     Metadata,RAID1C3:        5.00GiB
>>>     System,RAID1C3:         32.00MiB
>>>     Unallocated:            85.79GiB
>>
[...]
> 
> RFE: improve 'dev usage' to show these details.
> 
> As a user I'd look at this output and assume a bug in btrfs-tools because of the repeated conflicting information.

What would be the expected output ?
What about the example below ?

  /dev/sdf, ID: 12
      Device size:             9.10TiB
      Device slack:              0.00B
      Data,RAID10:           784.31GiB
      Data,RAID10:             4.01TiB
      Data,RAID10:             3.34TiB
      Data,RAID6[3]:         458.56GiB
      Data,RAID6[5]:         144.07GiB
      Data,RAID6[7]:         293.03GiB
      Metadata,RAID10:         4.47GiB
      Metadata,RAID10:       352.00MiB
      Metadata,RAID10:         6.00GiB
      Metadata,RAID1C3:        5.00GiB
      System,RAID1C3:         32.00MiB
      Unallocated:            85.79GiB


Another possibility (but the output will change drastically, I am thinking to another command)

Filesystem '/'
	Data,RAID1:		123.45GiB
		/dev/sda	 12.34GiB
		/dev/sdb	 12.34GiB
	Data,RAID1:		123.45GiB
		/dev/sde	 12.34GiB
		/dev/sdf	 12.34GiB
	Data,RAID6:		123.45GiB
		/dev/sda	 12.34GiB
		/dev/sdb	 12.34GiB
		/dev/sdc	 12.34GiB
	Data,RAID6:		123.45GiB
		/dev/sdb	 12.34GiB
		/dev/sdc	 12.34GiB
		/dev/sdd	 12.34GiB
		/dev/sde	 12.34GiB
		/dev/sdf	 12.34GiB


The number are the chunks sizes (invented). Note: for RAID5/RAID6 a chunk will uses near all disks; however for (e.g.) RAID1  there is the possibility that CHUNKS use different disks pairs (see the two RAID1 instances).


BR
G.Baroncelli


-- 
gpg @keyserver.linux.it: Goffredo Baroncelli <kreijackATinwind.it>
Key fingerprint BBF5 1610 0B64 DAC6 5F7D  17B2 0EDA 9B37 8B82 E0B5

  reply	other threads:[~2020-07-20 17:57 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 16:13 Filesystem Went Read Only During Raid-10 to Raid-6 Data Conversion John Petrini
2020-07-15  1:18 ` Zygo Blaxell
     [not found]   ` <CADvYWxcq+-Fg0W9dmc-shwszF-7sX+GDVig0GncpvwKUDPfT7g@mail.gmail.com>
     [not found]     ` <20200716042739.GB8346@hungrycats.org>
2020-07-16 13:37       ` John Petrini
     [not found]         ` <CAJix6J9kmQjfFJJ1GwWXsX7WW6QKxPqpKx86g7hgA4PfbH5Rpg@mail.gmail.com>
2020-07-16 22:57           ` Zygo Blaxell
2020-07-17  1:11             ` John Petrini
2020-07-17  5:57               ` Zygo Blaxell
2020-07-17 22:54                 ` John Petrini
2020-07-18 10:36                 ` Steven Davies
2020-07-20 17:57                   ` Goffredo Baroncelli [this message]
2020-07-21 10:15                     ` Steven Davies
2020-07-21 20:48                       ` Goffredo Baroncelli
2020-07-23  8:57                         ` Steven Davies
2020-07-23 19:29                           ` Zygo Blaxell

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