<div dir="ltr"><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">Hi Roland KammererBelow </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">This is our version information：</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">DRBDADM_API_VERSION=1</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">DRBD_KERNEL_VERSION_CODE=0x080405</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">DRBDADM_VERSION_CODE=0x080906</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">DRBDADM_VERSION=8.9.6</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><br></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">The arbitration service I am talking about means that you can decide </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">to have only one device to provide services before the brain split occurs.</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><br></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">We know that the drbd configuration file can set the data recovery policy</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">script that is executed after the brain split, but these strategies may </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">cause partial data loss.</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><br></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">like ：</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">net {</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"> after-sb-0pri discard-younger-primary;</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">}</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><br></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">Therefore, in order to prevent data loss or IO tear, a stricter arbitration </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">strategy is needed to ensure that all IOs can only select one controller </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">to provide services after brain splitting.</div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><br></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">Moreover, it is necessary to ensure that the IO data in the pending state </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">after the synchronization network port is broken is returned in an error </div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap">manner, <span style="letter-spacing:0.2px">and then the data is retransmitted to the controller providing </span></div><div style="color:rgb(32,33,36);font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:0.2px;white-space:nowrap"><span style="letter-spacing:0.2px">the service selected by the arbitration mechanism. </span></div></div><br><div class="gmail_quote"><div dir="ltr">Roland Kammerer <<a href="mailto:roland.kammerer@linbit.com">roland.kammerer@linbit.com</a>> 于2018年12月10日周一 下午3:14写道：<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Su Hua,<br>
<br>
I'm afraid I don't understand what you are talking about.<br>
<br>
On Mon, Dec 10, 2018 at 09:28:09AM +0800, Su Hua wrote:<br>
> Excuse me, the latest drbd driver<br>
<br>
Latest 8.4, or latest 9.0?<br>
<br>
> can provide the arbitration service<br>
<br>
What is the "arbitration service" for DRBD?<br>
<br>
> instead of using the script <br>
<br>
Which script?<br>
<br>
> that is fixed afterwards,<br>
<br>
Who fixed which script in which way and why?<br>
<br>
> which may cause partial data loss under the GFS2 cluster file system.<br>
<br>
About what concrete scenario are you talking?<br>
<br>
Regards, rck<br>
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</blockquote></div>