MESSAGE
| DATE | 2015-05-06 |
| FROM | Ruben
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| SUBJECT | Subject: [LIU Comp Sci] Fwd: Re: [opensuse] Re: no space left on the device
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From owner-learn-outgoing-at-mrbrklyn.com Wed May 6 07:45:21 2015
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Message-ID: <5549FEB6.2000507-at-my.liu.edu>
Date: Wed, 06 May 2015 07:44:54 -0400
From: Ruben
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To: learn-at-nylxs.com, Mohammed Ghriga ,
"Jose A. Rodriguez"
Subject: [LIU Comp Sci] Fwd: Re: [opensuse] Re: no space left on the device
References: <5549FBFE.90500-at-antonaylward.com>
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the stuff I learned this semester is showing up everywhere. All this
stuff I didn't understand before, I now can be in the conversation and
even ask intelligent questions.
Thank you...
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To: opensuse-at-opensuse.org
Subject: Re: [opensuse] Re: no space left on the device
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On 05/05/2015 04:48 PM, John Andersen wrote:
> If BTRFS better balanced its trees
Good point but not the best way of putting it.
Having written error correcting disk drivers I know that you can't spend
much time in the kernel doing 'disk work'. A thread that balances the
kernel as reading and writing proceeds is just that and will impact the
user-perceived performance.
Perhaps, since other B-tree based file systems seem to manage this,
there is a fundamental design problem . There are external balance
utilities just as there are FSCK programs for other file systems or
de-fragmentation on MS-DOS file systems that need it (and certain
archaic and rarely used early UNIX file systems).
I'm not saying that BtrFS is "broken by design", but rather that a
design decision is a limitation. I consider the fixed number of inodes
allocated in the ext[234] file systems, something inherited from the
1970s origins of UNIX and only rectified in ReiserFS and XFS and
similar, to be a similar design decision that I see as being a
limitation. It doesn't affect day to day performance until the systems
stops dead, though.
The thing is that you can't really report 'design decision' as bugs,
certain not this late in the game.
I've tried complaining about fixed inodes in ext4 after running into
inode exhaustion, and I was told to "over provision". Now isn't that
what is being said about BtrFS? "Disks is cheap, make the file system
larger, over 100G..."
--
A: Yes.
> Q: Are you sure?
>> A: Because it reverses the logical flow of conversation.
>>> Q: Why is top posting frowned upon?
--
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