On Fri, 4 Jan 2008, Changliang Chen wrote:
Hi Justin£¬
From your report£¬It looks that the p34-default's behavior is
better£¬which item make you consider that the p34-dchinner looks nice£¿
--
Best Regards
The re-write and sequential input and output is faster for dchinner.
Justin.
Peter Grandi wrote:
In particular if one uses parity-based (not a good idea in
general...) arrays, as small chunk sizes (as well as stripe
sizes) give a better chance of reducing the frequency of RMW.
Thanks for your thoughts - the above was my thinking when I posted.
Regards,
Richard
-
To u
>> Why does mdadm still use 64k for the default chunk size?
> Probably because this is the best balance for average file
> sizes, which are smaller than you seem to be testing with?
Well "average file sizes" relate less to chunk sizes than access
patterns do. Single threaded sequential reads with
Justin Piszcz wrote:
Dave's original e-mail:
# mkfs.xfs -f -l lazy-count=1,version=2,size=128m -i attr=2 -d
agcount=4
# mount -o logbsize=256k
And if you don't care about filsystem corruption on power loss:
# mount -o logbsize=256k,nobarrier
Those mkfs values (except for log size
Justin Piszcz wrote:
Why does mdadm still use 64k for the default chunk size?
Probably because this is the best balance for average file sizes, which
are smaller than you seem to be testing with?
Regards,
Richard
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
th
In message <[EMAIL PROTECTED]> you wrote:
> what is nobarrier ?
...
> > > # mount -o logbsize=256k,nobarrier
See http://oss.sgi.com/projects/xfs/faq.html
Q: How can I address the problem with the write cache?
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang De
what is nobarrier ?
On 12/31/07, Justin Piszcz <[EMAIL PROTECTED]> wrote:
> Dave's original e-mail:
>
> > # mkfs.xfs -f -l lazy-count=1,version=2,size=128m -i attr=2 -d agcount=4
> >
> > # mount -o logbsize=256k
>
> > And if you don't care about filsystem corruption on power loss:
>
> > # moun
Dave's original e-mail:
# mkfs.xfs -f -l lazy-count=1,version=2,size=128m -i attr=2 -d agcount=4
# mount -o logbsize=256k
And if you don't care about filsystem corruption on power loss:
# mount -o logbsize=256k,nobarrier
Those mkfs values (except for log size) will be hte defaults