Difference between revisions of "Talk:Btrfs"

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(RAID-1 or RAID-5?: see btrfs wiki)
m (Subvolumes: remove closed discussion)
 
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== Comment about stability ==
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{{Note|The name of the file system does not seem to have an official capitalization, so the rule for the ArchWiki has been arbitrarily set to use "Btrfs" (capital "B" and the rest lower-case); "btrfs" and "BTRFS" are therefore wrong spellings in this wiki. -- [[User:Kynikos|Kynikos]] ([[User talk:Kynikos|talk]]) 09:36, 6 January 2014 (UTC)}}
Btrfs is still under heavy development; it might be useful if someone familiar with btrfs were to add a section commenting on its overall stability. [[User:Vikingurinn|Vikingurinn]] ([[User talk:Vikingurinn|talk]]) 16:52, 17 December 2012 (UTC)
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== RAID-1 or RAID-5? ==
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== Things to do ==
  
"''3 1TB disks in an md based raid1 yields a /dev/md0 with 1TB free space and the ability to safely loose 2 disks without losing data. '''3 1TB disks in a btrfs volume with data=raid1 will allow the storage of approximately 1.5TB of data before reporting full. Only 1 disk can safely be lost without losing data'''.''"
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Here are some items that seem to need addressing on this article. I am working on various parts of it at the moment.
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# Reflow headings:
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## Goals: [[Effective_Use_of_Headers#Use_of_headers_and_headings]]
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### Helpful ideas:
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#### [[Effective_Use_of_Headers#False_multi-level_structure]]
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##### Side-note
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##### Auxiliary information
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#### [[Effective_Use_of_Headers#Multi-level_structure]]
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##### Group arguments
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##### Alternative arguments
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##### Contradictory arguments
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#### [[Effective_Use_of_Headers#The_header_text]]
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#### [[Article_Naming_Guidelines]]
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##### Specificity, "Descriptivity," Brevity, "Expandibility,"
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### See [https://btrfs.wiki.kernel.org/index.php/Main_Page Btrfs Wiki] for ideas.
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### See [[Beginners' Guide]] for ideas.
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## Proposed changes
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### "Installation" -> "'''Preparation'''"
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#### New -> "'''System Requirements'''"
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#### Remove -> "Additional packages"
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##### Move -> links to "See also" or "Related".
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#### "Partitioning" -> "'''Prepare the storage drive'''"
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##### '''OR:''' "Partitioning" (as a child) -> "'''''Choose a partition scheme'''''"
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### New -> "'''Create file systems'''"
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#### "Creating a new file system" -> "'''New file systems'''"
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##### "'''Examples'''"
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###### New -> "'''Single-drive file systems'''"
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###### "Multi-device filesystem and RAID feature" -> "'''Multi-drive file systems'''"
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####### Reduce content, provide links to "Btrfs Wiki" instead.
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#### "Convert from Ext3/4" -> "'''Convert existing file system'''"
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### New -> "'''Configuring the file system'''"
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#### '''OR:''' Move -> "'''Tips and tricks'''"
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#### Move -> "'''Mount options'''"
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##### "Copy-On-Write (CoW)" -> "'''Copy-on-write'''"
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###### "Checkpoint Interval" -> '''Merge'''
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##### Move -> "'''Compression'''"
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#### New -> "'''Skinny extents'''"
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#### Move -> "'''Sub-volumes'''"
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#### New -> "'''Quotas'''"
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### New -> "'''File system management'''"
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#### Move -> "'''Balance'''"
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#### Move -> "'''Defragmentation'''"
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#### Move -> "'''Display used/free space'''"
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#### Move -> "'''Balance'''"
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#### Move -> "'''Snapshots'''"
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### Move -> "'''Tips and tricks'''"
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### New -> "'''Troubleshooting'''"
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#### Move -> "'''Encryption'''"
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#### Move -> "'''GRUB'''"
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#### Move -> "'''Swap file'''"
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#### New -> "'''Btrfsck'''"
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##### See -> https://bbs.archlinux.org/viewtopic.php?id=156100
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### Move -> "'''See also'''"
  
That sounds more like some kind of weird, inefficient RAID-5 arrangement than RAID-1. I don't know btrfs enough to say it's wrong, but I know RAID-1 enough to question it?
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Edits:
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[[User:AdamT|AdamT]] ([[User_talk:AdamT|Talk]]) 08:27, 28 November 2013 (UTC);
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[[User:AdamT|AdamT]] ([[User_talk:AdamT|Talk]]) 04:03, 29 November 2013 (UTC);
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[[User:AdamT|AdamT]] ([[User_talk:AdamT|Talk]]) 04:10, 29 November 2013 (UTC);
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[[User:AdamT|AdamT]] ([[User_talk:AdamT|Talk]]) 02:35, 4 December 2013 (UTC)
  
[[User:Fukawi2|Fukawi2]] ([[User talk:Fukawi2|talk]]) 23:52, 29 April 2013 (UTC)
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: I hope to get to this soon if there are no objections or comments. [[User:AdamT|AdamT]] ([[User_talk:AdamT|Talk]]) 20:09, 4 January 2014 (UTC)
:See [https://btrfs.wiki.kernel.org/index.php/FAQ#What_are_the_differences_among_MD-RAID_.2F_device_mapper_.2F_btrfs_raid.3F btrfs wiki]:
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:''btrfs combines all the drives into a storage pool first, and then duplicates the chunks as file data is created. RAID-1 is defined currently as "2 copies of all the data on different disks". This differs from MD-RAID and dmraid, in that those make exactly n copies for n disks. In a btrfs RAID-1 on 3 1TB drives we get 1.5TB of usable data. Because each block is only copied to 2 drives, writing a given block only requires exactly 2 drives spin up, reading requires only 1 drive to spinup.''
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: -- [[User:Karol|Karol]] ([[User talk:Karol|talk]]) 15:59, 17 June 2013 (UTC)
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== btrfs with fsck hook and fstab pass ==
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:: I believe all of his has been addressed except for quotas. -- [[User:Rdeckard|Rdeckard]] ([[User_talk:Rdeckard|talk]]) 17:27, 25 July 2016 (UTC)
  
Apparently one does not need to have a btrfs partition fscked on boot, so there should be a '0' for 'pass' in the fstab for any btrfs partion.
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== "Displaying used/free space" needs rewrite ==
I had relatively slow boot ups with a pass of '1' (btrfs was root)
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/791020/comments/27
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Section "Displaying used/free space" needs a rewrite. I will hopefully do that when I have time.
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* The example with /usr/bin/df is misleading (on simple setups it's reporting disk usage ('used' value) quite accurate).
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* "btrfs filesystem usage" should be mentioned on top
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* there should be a link to https://btrfs.wiki.kernel.org/index.php/FAQ#How_much_free_space_do_I_have.3F
  
the genfstab script puts a '1' in for 'pass' by default
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{{unsigned|03:28, 17 November 2016‎|Mearon}}

Latest revision as of 08:55, 17 November 2016

Note: The name of the file system does not seem to have an official capitalization, so the rule for the ArchWiki has been arbitrarily set to use "Btrfs" (capital "B" and the rest lower-case); "btrfs" and "BTRFS" are therefore wrong spellings in this wiki. -- Kynikos (talk) 09:36, 6 January 2014 (UTC)

Things to do

Here are some items that seem to need addressing on this article. I am working on various parts of it at the moment.

  1. Reflow headings:
    1. Goals: Effective_Use_of_Headers#Use_of_headers_and_headings
      1. Helpful ideas:
        1. Effective_Use_of_Headers#False_multi-level_structure
          1. Side-note
          2. Auxiliary information
        2. Effective_Use_of_Headers#Multi-level_structure
          1. Group arguments
          2. Alternative arguments
          3. Contradictory arguments
        3. Effective_Use_of_Headers#The_header_text
        4. Article_Naming_Guidelines
          1. Specificity, "Descriptivity," Brevity, "Expandibility,"
      2. See Btrfs Wiki for ideas.
      3. See Beginners' Guide for ideas.
    2. Proposed changes
      1. "Installation" -> "Preparation"
        1. New -> "System Requirements"
        2. Remove -> "Additional packages"
          1. Move -> links to "See also" or "Related".
        3. "Partitioning" -> "Prepare the storage drive"
          1. OR: "Partitioning" (as a child) -> "Choose a partition scheme"
      2. New -> "Create file systems"
        1. "Creating a new file system" -> "New file systems"
          1. "Examples"
            1. New -> "Single-drive file systems"
            2. "Multi-device filesystem and RAID feature" -> "Multi-drive file systems"
              1. Reduce content, provide links to "Btrfs Wiki" instead.
        2. "Convert from Ext3/4" -> "Convert existing file system"
      3. New -> "Configuring the file system"
        1. OR: Move -> "Tips and tricks"
        2. Move -> "Mount options"
          1. "Copy-On-Write (CoW)" -> "Copy-on-write"
            1. "Checkpoint Interval" -> Merge
          2. Move -> "Compression"
        3. New -> "Skinny extents"
        4. Move -> "Sub-volumes"
        5. New -> "Quotas"
      4. New -> "File system management"
        1. Move -> "Balance"
        2. Move -> "Defragmentation"
        3. Move -> "Display used/free space"
        4. Move -> "Balance"
        5. Move -> "Snapshots"
      5. Move -> "Tips and tricks"
      6. New -> "Troubleshooting"
        1. Move -> "Encryption"
        2. Move -> "GRUB"
        3. Move -> "Swap file"
        4. New -> "Btrfsck"
          1. See -> https://bbs.archlinux.org/viewtopic.php?id=156100
      7. Move -> "See also"

Edits: AdamT (Talk) 08:27, 28 November 2013 (UTC); AdamT (Talk) 04:03, 29 November 2013 (UTC); AdamT (Talk) 04:10, 29 November 2013 (UTC); AdamT (Talk) 02:35, 4 December 2013 (UTC)

I hope to get to this soon if there are no objections or comments. AdamT (Talk) 20:09, 4 January 2014 (UTC)
I believe all of his has been addressed except for quotas. -- Rdeckard (talk) 17:27, 25 July 2016 (UTC)

"Displaying used/free space" needs rewrite

Section "Displaying used/free space" needs a rewrite. I will hopefully do that when I have time.

—This unsigned comment is by Mearon (talk) 03:28, 17 November 2016‎. Please sign your posts with ~~~~!