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<DIV dir=ltr align=left><SPAN class=264384106-20112009><FONT face=Arial
color=#0000ff>Using protocol B is not appropriate for data
consistency. There should be something done by DRBD while
sending/receiving NegAck.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=264384106-20112009><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=264384106-20112009><FONT face=Arial
color=#0000ff>Regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=264384106-20112009><FONT face=Arial
color=#0000ff>Kapil</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma><B>From:</B> drbd-user-bounces@lists.linbit.com
[mailto:drbd-user-bounces@lists.linbit.com] <B>On Behalf Of </B>guohuai
li<BR><B>Sent:</B> Friday, November 20, 2009 11:31 AM<BR><B>To:</B>
lars.ellenberg@linbit.com; drbd user;
guohuailee0927@gmail.com<BR><B>Subject:</B> Re: [DRBD-user] kernel: drbd0: Got
NegAck packet. Peeris in troubles?<BR></FONT><BR></DIV>
<DIV></DIV>Hi, dear all,<BR> <BR>Now "protocol B" is used, no such
issue.<BR> <BR>regards,<BR>Edward<BR> <BR>
<HR id=stopSpelling>
From: guohuai_li@hotmail.com<BR>To: lars.ellenberg@linbit.com;
drbd-user@lists.linbit.com; guohuai_li@hotmail.com;
guohuailee0927@gmail.com<BR>Subject: RE: [DRBD-user] kernel: drbd0: Got NegAck
packet. Peer is in troubles?<BR>Date: Mon, 16 Nov 2009 19:34:12 +0800<BR><BR>
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Dear lars,<BR> <BR>In this case:<BR>now DRBD runs well both on primay node
and secondary node. <BR>(Suse linux OS.)<BR>(DRBD-8.3.0, use
Protocol C. )<BR> <BR>On primary node, one process use linux app
"msync"(sync mode) to sync the content to disk.<BR>(And this disk is the block
device which DRBD protected.)<BR> <BR>Now on the secondary node, the disk
has some problem (for example, the disk is pull out from the
machine...).<BR>At this very point, the thread will block while
calling "msync" api; but, api "fsync" will not be blocked.<BR>( I reproduced
this issue in lab, "UpToDate -> Diskless " in /var/log/messages happened
at the same time with the time <BR> when "msync" calling is
blocked. )<BR> <BR>About 3 minutes later, another process is invoked by me,
and it will call "msync" api also, but now, it will not be
blocked.<BR> <BR>So, i think "msync" (sync mode)calling is waiting the OS
to tell it that the data is flushed to disk. <BR>But the local disk will
not mark the data is flushed to local disk until the remote disk is
flushed. (Because DRBD used "Protocol C".)<BR>But at this very point, the
remote disk has some problem, (for example, the disk has problem; I reproduded
this issue by pulling the disk out ...)<BR>So, "msync" calling is block.<BR>But
when DRBD found remore disk is "Diskless", "msync" api will not be blocked.
<BR>Because DRBD has the intelligence that remote disk is "Diskless", so it will
not check the remore disk to flush data.<BR>And when local disk is flushed, it
will mark the data is flushed. So, at this time, "msync" calling will not be
blocked.<BR> <BR>Would you help to explain it ? <BR>How could I solve
this problem ?<BR> <BR>Best
regards,<BR>Edward<BR> <BR>+++++++++++++++++++++++++++++++ in
/var/log/messages of primary node ++++++++++++++++++++++++++++++ <BR>Nov
16 17:19:27 linux-17 kernel: drbd0: Got NegAck packet. Peer is in
troubles?<BR>Nov 16 17:19:27 linux-17 kernel: drbd0: pdsk( UpToDate ->
Diskless )<BR>Nov 16 17:19:27 linux-17 kernel: drbd0: Creating new current
UUID<BR> <BR>+++++++++++++++++++++++++++++++ below is on primary node
++++++++++++++++++++++++++++++++++++++++++++++<BR>linux-17:~ # cat
/proc/drbd <BR>version: 8.3.0 (api:88/proto:86-89)<BR>GIT-hash:
9ba8b93e24d842f0dd3fb1f9b90e8348ddb95829 build by <A
href="mailto:root@linux-17">root@linux-17</A>, 2009-02-21 11:09:33<BR> 0:
cs:Connected ro:Primary/Secondary ds:UpToDate/Diskless C
r---<BR> ns:1243340 nr:168424 dw:1554336 dr:70703 al:28 bm:63
lo:0 pe:2 ua:0 ap:1 ep:1 wo:b oos:28<BR> 1: cs:Connected
ro:Primary/Secondary ds:UpToDate/UpToDate C r---<BR> ns:0
nr:53248 dw:6283648 dr:1833 al:3 bm:16 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b
oos:0<BR> 2: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C
r---<BR> ns:0 nr:8 dw:11 dr:96 al:1 bm:3 lo:0 pe:0 ua:0 ap:0
ep:1 wo:b
oos:0<BR>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++<BR><BR> <BR>>
Date: Mon, 16 Nov 2009 09:42:25 +0100<BR>> From:
lars.ellenberg@linbit.com<BR>> To: drbd-user@lists.linbit.com<BR>>
Subject: Re: [DRBD-user] kernel: drbd0: Got NegAck packet. Peer is in
troubles?<BR>> <BR>> On Sat, Nov 14, 2009 at 09:27:12AM +0800, guohuai li
wrote:<BR>> > <BR>> > i use drbd8.3.0<BR>> <BR>> we have 8.3.5
respective 8.3.6 now.<BR>> <BR>> > i also met such problem.<BR>>
> <BR>> > I used msync linux api (sync mode) to write on primary
node.<BR>> > <BR>> > And also it blocks at this case.<BR>>
<BR>> In _which_ case does _what_ block,<BR>> and what exactly do you mean
by "block"?<BR>> <BR>> when "it" "blocks",<BR>> I'd like to know what
happened up to that point,<BR>> have the kernel logs,<BR>> cat
/proc/drbd<BR>> and<BR>> ps -eo pid,state,wchan:30,cmd<BR>> <BR>>
Thanks.<BR>> <BR>> <BR>> -- <BR>> : Lars Ellenberg<BR>> : LINBIT
| Your Way to High Availability<BR>> : DRBD/HA support and consulting
http://www.linbit.com<BR>> <BR>> DRBD® and LINBIT® are registered
trademarks of LINBIT, Austria.<BR>> __<BR>> please don't Cc me, but send
to list -- I'm subscribed<BR>>
_______________________________________________<BR>> drbd-user mailing
list<BR>> drbd-user@lists.linbit.com<BR>>
http://lists.linbit.com/mailman/listinfo/drbd-user<BR><BR>
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