<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hello:<div class=""><br class=""><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><span class="Apple-tab-span" style="white-space:pre"> </span>My environment like this:</div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><br class=""></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Host</div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> Multipath</div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> Iscsi dev 1. Iscsi dev. 2</div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> (A/ optimized) <span class="">(A/ optimized) (ALUA)</span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><span class=""><br class=""></span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class="">Server</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class=""> Target 1 Target 2</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class=""> （ser 1) (ser 2)</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class=""><br class=""></font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class=""> When dev 1 failed, the IO on dev 1 forward to dev2 without any operation,</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class="">So I have no chance to do something for the dev 1’s error.</font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><font color="#000000" class=""> <span class="">Before I finish the error on </span></font><span class="">dev1, I do not want any IO on dev1 forward to dev2.</span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><span class="">Is there any </span><span class="">Mechanism or method can be used? </span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"><span class=""> </span><font color="#000000" class="">Best Wishes.</font></div></div></body></html>