Hello
I am having very similar issue.
Scenario 1 )When I mount a rbd volume directly using rbd map command to
a linux kernel. I am getting good performance.
when I do dd on the above volume, I am getting 380 - 430 MB's. -- I am good
with this.
Scenario 2 ) I am using iscsi-gateway.
Thank you for your opinion of max_sectors_kb, Ulrich.
It provided me some inspiration for understanding the whole thing.
Thank you for your advice, Mike.
I will tune some parameters as you have mentioned below.
I will share if I could make achievements in performance tuning.
在 2018年9月21日星期五
On 09/12/2018 09:26 PM, 3kboy2...@gmail.com wrote:
> Thank you for your reply, Mike.
> Now my iscsi disk performance can be around 300MB/s in 4M sequence
> write(TCMU+LIO)
> It increase from 20MB/s to 300MB/s, after I can change max_data_area_mb
> from 8 to 256 && hw_max_sectors from 128 to 8192.
Hi!
I'm somewhat surprised: Maybe it's all about latency, because with FC-SAN we
typically see a performance _decrease_ if large sequential requests are being
transmitted. So actually we did limit the default amount of max_sectors_kb.
Most "intelligent" SAN systems break down large requests to
Thank you for your reply, Mike.
Now my iscsi disk performance can be around 300MB/s in 4M sequence
write(TCMU+LIO)
It increase from 20MB/s to 300MB/s, after I can change max_data_area_mb
from 8 to 256 && hw_max_sectors from 128 to 8192.
To my cluster, after a lot of tests I found that I should
On 09/11/2018 11:30 AM, Mike Christie wrote:
> Hey,
>
> Cc mchri...@redhat.com, or I will not see these messages until I check
> the list maybe once a week.
>
> On 09/05/2018 10:36 PM, 3kboy2...@gmail.com wrote:
>> What lio fabric driver are you using? iSCSI? What kernel version
>>
Hey,
Cc mchri...@redhat.com, or I will not see these messages until I check
the list maybe once a week.
On 09/05/2018 10:36 PM, 3kboy2...@gmail.com wrote:
> What lio fabric driver are you using? iSCSI? What kernel version
> and
> what version of tcmu-runner?
>
> io
Sorry ,the capture for targetcli seems can not display correctly.Paste it
again.
o- /
.
[...]
o- backstores
On 09/03/2018 02:31 AM, 3kboy2...@gmail.com wrote:
> Hello Mike,
>
> I am very appreciate for your instruction.
> Now I can set hw_max_sectors through targcli when i create the device.
> I set it to 8192 same as raw rbd device.
> The performance improve a little, 4M seq write increase from
Hello Mike,
I am very appreciate for your instruction.
Now I can set hw_max_sectors through targcli when i create the device. I
set it to 8192 same as raw rbd device.
The performance improve a little, 4M seq write increase from 24MB/s to
40MB/s.(hw_max_sectors 64->8192, it is a
Hello Mike,
I am very appreciate for your instruction.
Now I can set hw_max_sectors through targcli when i create the device. I
set it to 8192 same as raw rbd device.
The performance improve a little, 4M seq write increase from 24MB/s to
40MB/s.(hw_max_sectors 64->8192, it is a
Hello Mike,
Thank you for your informative response.
在 2018年8月28日星期二 UTC+8上午8:49:46，Mike Christie写道：
>
> On 08/21/2018 08:52 PM, 3kbo...@gmail.com wrote:
> > Hi folks,
> >
> > I am newbie to open-iscsi.
> > My case is I export ceph rbd by open-iscsi.
> >
> > I found the max_sectors_kb is
On 08/21/2018 08:52 PM, 3kboy2...@gmail.com wrote:
> Hi folks,
>
> I am newbie to open-iscsi.
> My case is I export ceph rbd by open-iscsi.
>
> I found the max_sectors_kb is 64, the value is so small, and 4M sequence
> write is only about 10MB/s.
> I can not increase max_sectors_kb, if I do it
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