Aneesh Kumar K.V wrote:
Hi All,
I looked at the delalloc and reservation differences that Valerie was
observing.
Below is my understanding. I am not sure whether the below will result
in higher fragmentation that Eric Sandeen is observing. I guess it
should not. Even
though the reservation
Alex Tomas wrote:
sorry, I don't quite understand how do you observe this with nomballoc
thanks, Alex
Aneesh Kumar K.V wrote:
mballoc by default doesn't give the particular layout only if i force
small
size to use inode preallocation i am hitting the problem. ie to change
the
below line in
ah, got it now. I think the solution would be to discard preallocated blocks
once blocks for all dirty data are allocated and file is closed. In the previous
version of delalloc I did this passing NOPREALLOC hint. something similar should
be done in the newer one, I guess.
thanks, Alex
Aneesh Ku
Alex Tomas wrote:
Hi,
could you try the patch attached. it should fix the issue. the idea
was to align requests in order to help raid5-like setups. but somewhere
I lost one bit in mballoc: it should pre-allocate all crossed stripes,
but it didn't.
as for discard, lustre doesn't use open/close
sorry, I don't quite understand how do you observe this with nomballoc
thanks, Alex
Aneesh Kumar K.V wrote:
mballoc by default doesn't give the particular layout only if i force small
size to use inode preallocation i am hitting the problem. ie to change the
below line in ext4_mb_group_or_file
r data, so discard-on-close
makes zero sense in our case. I'm not very positive whether we need to
drop preallocation on file close in case of delayed allocation as writeback
can be started while file is open and finish after close(2).
thanks, Alex
Aneesh Kumar K.V wrote:
Hi All,
I looked at t
I guess the list dropped this mail. Sending again.
-aneesh
--- Begin Message ---
Aneesh Kumar K.V wrote:
Hi All,
I looked at the delalloc and reservation differences that Valerie was
observing.
Below is my understanding. I am not sure whether the below will result
in higher fragmentation
Hi All,
I looked at the delalloc and reservation differences that Valerie was observing.
Below is my understanding. I am not sure whether the below will result in
higher fragmentation that Eric Sandeen is observing. I guess it should not. Even
though the reservation gets discarded during the
