2011/7/28 Gregory Farnum <[email protected]>:
> On Wed, Jul 27, 2011 at 9:05 AM, Gregory Farnum
> <[email protected]> wrote:
>> The doubled writes can be annoying, but it's really the only safe
>> thing to do. Perhaps we could do something with btrfs and snapshots to
>> avoid using a journal, but I'd have to look into it some more.
> Actually this already works -- you are data safe if you run btrfs
> without a journal. Apparently it's even slower, though -- you need to
> go through a lot more syncs to guarantee your data safety.
>
we use btrfs and without journal, it turns out that :
the performance of big write(10GB) is good, but the rm dir ops goes slow.
So we reset the value of "filestore max sync interval = 0.1", the rm
dirs rate increased.
Does this related to version of ceph kernel Client and kernel ? Can we
promote the DIR ops
performance on OSD end?
> So your best bet if it's a real problem is to add a fast disk to use
> as your journaling device.
>
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