вт, 2 мар. 2021 г. в 13:52, James Page :
(Disclaimer: I have never tried to run Ceph on bcache in production,
and the test cluster was destroyed before reaching its first deep
scrub)
> b) turn off the sequential cutoff
>
> sequential_cutoff = 0
>
> This means that sequential writes will also
Hi Norman
On Wed, Mar 3, 2021 at 2:47 AM Norman.Kern wrote:
> James,
>
> Can you tell me what's the hardware config of your bcache? I use the 400G
> SATA SSD as cache device and
>
> 10T HDD as the storage device. Hardware relationed?
>
It might be - all of the deployments I've seen/worked
James,
Can you tell me what's the hardware config of your bcache? I use the 400G SATA
SSD as cache device and
10T HDD as the storage device. Hardware relationed?
On 2021/3/2 下午4:49, James Page wrote:
> Hi Norman
>
> On Mon, Mar 1, 2021 at 4:38 AM Norman.Kern wrote:
>
>> Hi, guys
>>
>> I am
On Tue, Mar 02, 2021 at 05:47:29PM +0800, Norman.Kern wrote:
> Matthias,
>
> I agreed with you for tuning. I ask this question just for that my OSDs have
> problems when the
>
> cache_available_percent less than 30, the SSDs almost useless and all I/Os
> bypass to HDDs with large latency.
Hello,
we clearly understood that. But in ceph we have the concept of "OSD
Journal on very fast different disk".
I just asked what in theory should be the advantage of caching on
bcache/NVME vs. Journal/NVME. I would not expect any performance
advantage for bcache (if the Journal is reasonably
On 2021/3/2 下午4:49, James Page wrote:
> Hi Norman
>
> On Mon, Mar 1, 2021 at 4:38 AM Norman.Kern wrote:
>
>> Hi, guys
>>
>> I am testing ceph on bcache devices, I found the performance is not good
>> as expected. Does anyone have any best practices for it? Thanks.
>>
> I've used bcache quite a
On 2021/3/2 上午5:09, Andreas John wrote:
> Hallo,
>
> do you expect that to be better (faster), than having the OSD's Journal
> on a different disk (ssd, nvme) ?
No, I created the OSD storage devices using bcache devices.
>
>
> rgds,
>
> derjohn
>
>
> On 01.03.21 05:37, Norman.Kern wrote:
>> Hi,
On 2021/3/1 下午6:32, Matthias Ferdinand wrote:
> On Mon, Mar 01, 2021 at 12:37:38PM +0800, Norman.Kern wrote:
>> Hi, guys
>>
>> I am testing ceph on bcache devices, I found the performance is not
>> good as expected. Does anyone have any best practices for it? Thanks.
> Hi,
>
> sorry to say, but
Hi Norman
On Mon, Mar 1, 2021 at 4:38 AM Norman.Kern wrote:
> Hi, guys
>
> I am testing ceph on bcache devices, I found the performance is not good
> as expected. Does anyone have any best practices for it? Thanks.
>
I've used bcache quite a bit with Ceph with the following configuration
On Mon, Mar 01, 2021 at 12:37:38PM +0800, Norman.Kern wrote:
> Hi, guys
>
> I am testing ceph on bcache devices, I found the performance is not
> good as expected. Does anyone have any best practices for it? Thanks.
Hi,
sorry to say, but since use cases and workloads differ so much, there is
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