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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-indent:36.0pt'>Many thanks for your time, I try to run DRBD on embedded system, spi flash(32MB) with mtdblock device node, but got some issues.<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>Kernel version: 3.2.61, <span style='font-size:10.5pt'>DRBD version is 8.4.4( the same situations on 8.3.11), </span>the flash has two partition( mtdblock6 is 16MB, mtdblock7 is 16MB), mtdblock6 is mount on /.data .<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>1. Reboot system, the /.data would be lost after DRBD sync. After I turn off DRBD, the phenomenon has been improved, but not solved;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>2. I just set mtdblock7 in configuration file, but /.data(mtdblock6) would sync at the same time when sync, all of them are in one flash;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>3. The sync rate is too slow, only 150+k/s, I tried to modify the configuration file, but it is Invalid.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-indent:36.0pt'>Running the same version of DRBD on Ubuntu with the same configuration(not MTD), the results are normal, the situation didn’t happen like before. <o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>I try to find out the reason, but there is no direct evidence showing that is caused by mtdblock, and DRBD document not mentioned that either, could you give me some help or suggestions?<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>Thanks extremely for your help~ <span style='font-family:"Segoe UI Symbol",sans-serif'>☺</span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal>Yaozhi.zhao<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-indent:36.0pt'>The configuration file:<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>resource res0 {<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> protocol C;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> device /dev/drbd0;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> disk /dev/mtdblock7;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> meta-disk internal;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> on nod1 {<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> address 192.168.1.1:7789;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> }<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> on nod2 {<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> address 192.168.1.2:7789;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> }<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> syncer {<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> al-extents 3389;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> rate 50M;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> }<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> disk {<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> on-io-error detach;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> no-disk-flushes;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> no-md-flushes;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> no-disk-barrier;<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'> }<o:p></o:p></p><p class=MsoNormal style='text-indent:36.0pt'>}<o:p></o:p></p></div></body></html>