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Btrfs uses below equation to calculate ra_pages:
fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
4 * 1024 * 1024 / PAGE_CACHE_SIZE);
is the max() a typo of min()? This makes the readahead size is 4M by default,
which is too big.
I have a system with 16 CPU, 6G mem
If the amount of free space left in a device is less than what we think should
be the minimum size, just ignore the minimum size and use the amount we have. I
ran into this running tests on a 600mb volume, the chunk allocator wouldn't let
me allocate the last 52mb of the disk for data because we w
On Wednesday 17 March 2010 16:33:41 Leszek Ciesielski wrote:
> On Wed, Mar 17, 2010 at 4:25 PM, Hubert Kario wrote:
> > On Wednesday 17 March 2010 09:48:18 Heinz-Josef Claes wrote:
> >> Hi,
> >>
> >> just want to add one correction to your thoughts:
> >>
> >> Storage is not cheap if you think abou
Chris,
Something that probably should be fixed is how
merging extent maps with block_len == -1 produces
illegal lengths, as in 8191.
I saw it with holes in directIO and it is not the
cause of my current problems so I'll hope someone
else decides to fix.
jim
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On Wed, Mar 17, 2010 at 4:25 PM, Hubert Kario wrote:
> On Wednesday 17 March 2010 09:48:18 Heinz-Josef Claes wrote:
>> Hi,
>>
>> just want to add one correction to your thoughts:
>>
>> Storage is not cheap if you think about enterprise storage on a SAN,
>> replicated to another data centre. Using
On Wednesday 17 March 2010 09:48:18 Heinz-Josef Claes wrote:
> Hi,
>
> just want to add one correction to your thoughts:
>
> Storage is not cheap if you think about enterprise storage on a SAN,
> replicated to another data centre. Using dedup on the storage boxes leads
> to performance issues an
On Wed, Mar 17, 2010 at 05:20:53PM +1100, Nick Piggin wrote:
> btrfs: use add_to_page_cache_lru, use __page_cache_alloc
>
> Pagecache pages should be allocated with __page_cache_alloc, so they
> obey pagecache memory policies.
>
> add_to_page_cache_lru is exported, so it should be used. Benefits
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Hi,
just want to add one correction to your thoughts:
Storage is not cheap if you think about enterprise storage on a SAN,
replicated to another data centre. Using dedup on the storage boxes leads to
performance issues and other problems - only NetApp is offering this at the
moment and it's no
On 17/03/2010 01:45, Hubert Kario wrote:
On Tuesday 16 March 2010 10:21:43 David Brown wrote:
Hi,
I was wondering if there has been any thought or progress in
content-based storage for btrfs beyond the suggestion in the "Project
ideas" wiki page?
The basic idea, as I understand it, is that a l
On 16/03/2010 23:45, Fabio wrote:
Some years ago I was searching for that kind of functionality and found
an experimental ext3 patch to allow the so-called COW-links:
http://lwn.net/Articles/76616/
I'd read about the COW patches for ext3 before. While there is
certainly some similarity here,
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