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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi all,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We are seeing a problem <span class=GramE>where <span
style='mso-spacerun:yes'> </span><span class=SpellE>resyncing</span></span>
multiple <span class=SpellE>drbd</span> volumes<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>say</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> r0,r1,r2 reports
the wrong sync speed stats.<span style='mso-spacerun:yes'> </span>It
seems to get worst<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>and</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> worst.<span
style='mso-spacerun:yes'> </span>So r0 would report 30meg/S, r1 19Meg/sec
and r2 9Meg/sec.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>These rates are not the true rates except for the first one.
In reality,<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>all</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> the volumes
took the same time to <span class=SpellE>resync</span> and they have the same
size.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The problem I think is that while one volume is Syncing the
next volume in <o:p></o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>PauseSyncX</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> get some
activity and ends up calling __<span class=SpellE>drbd_set_in_<span
class=GramE>sync</span></span><span class=GramE>()</span> <o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>from</span></font></span><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> the <span
class=SpellE>asender</span> thread.<span style='mso-spacerun:yes'>
</span>When this happens <span class=SpellE>rs_mark_time</span> gets reset as
well<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>as</span></font></span><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <span
class=SpellE>rs_mark_left</span>. <span
style='mso-spacerun:yes'> </span>To illustrate <span class=GramE>this the</span>
change below would force the problem<o:p></o:p></span></font></p>
<p class=MsoNormal><span class=GramE><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>to</span></font></span><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> go away.<span
style='mso-spacerun:yes'> </span>I am not sure this is the correct patch
though:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Tahoma><span style='font-size:
9.0pt;font-family:Tahoma;color:black'>Index: <span class=SpellE>drbd/drbd_actlog.c</span><br>
===================================================================<br>
--- <span class=SpellE>drbd/drbd_actlog.c</span><span class=GramE> (</span>revision
11975)<br>
+++ <span class=SpellE>drbd/drbd_actlog.c</span><span class=GramE> (</span>working
copy)<br>
@@ -960<span class=GramE>,10</span> +960,12 @@<br>
// we need the lock for
<span class=SpellE>drbd_try_clear_on_disk_bm</span><br>
<span class=GramE>if(</span>jiffies
- <span class=SpellE>mdev</span>-><span class=SpellE>rs_mark_time</span>
> HZ*10) {<br>
/* should be <span class=SpellE>roling</span> marks, but we estimate
only anyways. */<br>
- <span
class=GramE>if(</span> <span class=SpellE>mdev</span>-><span class=SpellE>rs_mark_left</span>
!= <span class=SpellE>drbd_bm_total_weight</span>(<span class=SpellE>mdev</span>))
{<br>
-
<span class=SpellE><span class=GramE>mdev</span></span>-><span
class=SpellE>rs_mark_time</span> =jiffies;<br>
-
<span class=SpellE><span class=GramE>mdev</span></span>-><span
class=SpellE>rs_mark_left</span> =<span class=SpellE>drbd_bm_total_weight</span>(<span
class=SpellE>mdev</span>);<br>
- }<br>
+ <span
class=GramE>if(</span> (<span class=SpellE>mdev</span>-><span class=SpellE>rs_mark_left</span>
!= <span class=SpellE>drbd_bm_total_weight</span>(<span class=SpellE>mdev</span>))
&&<br>
+ <span class=SpellE><span
class=GramE>mdev</span></span>-><span class=SpellE>state.conn</span> != <span
class=SpellE>PausedSyncT</span> &&<br>
+ <span class=SpellE>mdev</span>-><span
class=SpellE><span class=GramE>state.conn</span></span><span class=GramE> !</span>=
<span class=SpellE>PausedSyncS</span> ) {<br>
+ <span class=SpellE><span
class=GramE>mdev</span></span>-><span class=SpellE>rs_mark_time</span>
=jiffies;<br>
+ <span class=SpellE><span
class=GramE>mdev</span></span>-><span class=SpellE>rs_mark_left</span> =<span
class=SpellE>drbd_bm_total_weight</span>(<span class=SpellE>mdev</span>);<br>
+ }<br>
}<br>
<span class=GramE>if(</span>
<span class=SpellE>inc_local_if_state</span>(<span class=SpellE>mdev,Attaching</span>)
) {<br>
<span class=SpellE>drbd_try_clear_on_disk_<span class=GramE>bm</span></span><span
class=GramE>(</span><span class=SpellE>mdev,sector,count,TRUE</span>);<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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