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<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'> Thank you for the reply; we are
deleting MYISAM tables not the INNODB tables.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'>And while dropping table I am able to
copy files in DRBD drive.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=blue face=Calibri><span style='font-size:
12.0pt;font-family:Calibri;color:blue'>BalReddy. <o:p></o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
pascal.charest@gmail.com [mailto:pascal.charest@gmail.com] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Pascal Charest<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, July 29, 2011 1:07
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Balreddy Medipally<br>
<b><span style='font-weight:bold'>Cc:</span></b> Matt Graham;
drbd-user@lists.linbit.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [DRBD-user] Deleting
directories/files from drbd drive getting hung for some time.</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Trebuchet MS"><span style='font-size:
12.0pt;font-family:"Trebuchet MS"'>Hi, <br clear=all>
</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face=sans-serif><span style='font-size:12.0pt;
font-family:sans-serif'>Wild guess here: Would you be using INNODB engine for
your >50gb tables, with --innodb-file-per-tables option set to 'true' in
/etc/my.cnf, and some high value for your buffers ? There are some creepy
bugs in MySQL that has no link with DRBD that would create such lockdown.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face=sans-serif><span style='font-size:12.0pt;
font-family:sans-serif'>As a tangent question: are you able to copy a
file to the file system while you drop that table in MySQL ? </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<div>
<p class=MsoNormal><font size=3 face=sans-serif><span style='font-size:12.0pt;
font-family:sans-serif'>P.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal><font size=3 face=sans-serif><span style='font-size:12.0pt;
font-family:sans-serif'> </span></font><o:p></o:p></p>
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<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3 face=sans-serif><span
style='font-size:12.0pt;font-family:sans-serif'>--<br>
Pascal Charest, <br>
Cutting-edge technology consultant @ Les Laboratoires Phoenix<br>
<a href="http://www.labsphoenix.com" target="_blank">http://www.labsphoenix.com</a>
</span></font><br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>On Wed, Jul 27, 2011 at 12:07 AM, Balreddy Medipally <<a
href="mailto:balreddy.m@imimobile.com">balreddy.m@imimobile.com</a>> wrote:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Hi Matt,<br>
<br>
I couldn't found anything like "sda:
Uncorrectable error" in<br>
dmesg and I am sure that there is no faulty HDD in our servers.<br>
Actually we are using DRBD for MySQL high availability, so when dropping<br>
some big table like 50GB or bigger than that applications are not able<br>
to access MySQL DB time particular time.<br>
<br>
Below is my drbd.conf file.<br>
<br>
# please have a a look at the example configuration file in<br>
# /usr/share/doc/drbd/drbd.conf<br>
#<br>
resource drbd0 {<br>
protocol C;<br>
startup {<br>
become-primary-on both;<br>
}<br>
net {<br>
timeout 60;<br>
max-epoch-size 8000;<br>
max-buffers 8000;<br>
unplug-watermark 128;<br>
connect-int 10;<br>
ping-int 10;<br>
sndbuf-size 1024k;<br>
ko-count 180;<br>
ping-timeout 5;<br>
allow-two-primaries;<br>
cram-hmac-alg sha256;<br>
shared-secret DRBDpassw0rd;<br>
after-sb-0pri discard-least-changes;<br>
after-sb-1pri violently-as0p;<br>
after-sb-2pri violently-as0p;<br>
rr-conflict violently;<br>
}<br>
syncer {<br>
rate 200M;<br>
al-extents 3389;<br>
}<br>
disk {<br>
no-disk-barrier;<br>
no-disk-flushes;<br>
no-md-flushes;<br>
on-io-error detach;<br>
}<br>
<br>
on DB-01 {<br>
device /dev/drbd0;<br>
disk
/dev/cciss/c0d0p2;<br>
address ipv4 <a
href="http://192.168.169.3:7768" target="_blank">192.168.169.3:7768</a>;<br>
meta-disk internal;<br>
}<br>
on DB-02 {<br>
device
/dev/drbd0;<br>
disk
/dev/cciss/c0d0p9;<br>
address ipv4 <a
href="http://192.168.169.4:7768" target="_blank">192.168.169.4:7768</a>;<br>
meta-disk internal;<br>
}<br>
}<br>
<br>
<br>
Thanks,<br>
Balreddy.<br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a><br>
[mailto:<a href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a>]
On Behalf Of Matt Graham<br>
Sent: Tuesday, July 26, 2011 10:01 PM<br>
To: <a href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a><br>
Subject: Re: [DRBD-user] Deleting directories/files from drbd drive<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>getting hung for some
time.<o:p></o:p></span></font></p>
</div>
<div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>From: "Balreddy Medipally" <<a
href="mailto:balreddy.m@imimobile.com">balreddy.m@imimobile.com</a>><br>
> We are using Protocol C in our drbd.conf file. [When we are]<br>
> deleting directories/files from drbd drive, [it's hanging up] for<br>
> some time. In this period of time it is not allowing us to do any<br>
> operations on [the] drbd drive.<br>
<br>
The first thing to do is to check the output from dmesg on both nodes<br>
and make<br>
sure you don't see anything like "sda: Uncorrectable error writing<br>
sector<br>
12345678". If you see this, it means one of your disks is dying<br>
horribly.<br>
This can cause delays while writing, since the kernel and disk will try<br>
to<br>
write to that sector several times.<br>
<br>
> Please let us know if there is any tuning to be done in drbd level.<br>
<br>
It's impossible to tell, since we can't see your drbd.conf. Put that<br>
file on<br>
your webspace somewhere, and follow up with a link.<br>
<br>
--<br>
Matt G / Dances With Crows<br>
The Crow202 Blog: <a href="http://crow202.org/wordpress/" target="_blank">http://crow202.org/wordpress/</a><br>
There is no Darkness in Eternity/But only Light too dim for us to see<br>
<br>
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