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I don't test with drbd-8.3 but with
8.0.14, 8.0.15rc and 8.0.16.
<br>
I have now tested the write throughput
with the following command:
<br>
dd if=/dev/zero
of=/dbase/test_write_drbd bs=500M count=2 conv=fsync,notrunc
<br>
successively in primary/secondary mode
and in standalone mode, with /dev/drbd0 mounted on /dbase
<br>
and then without drbd, /dev/sdb1
mounted on /dbase
<br>
<br>
for each configuration, this command
has been repeted 4 or 5 times.
<br>
<br>
Results for write throughput tests are:
<p style="margin-bottom: 0cm;" align="center"><br>
</p>
<table border="1" bordercolor="#000000" cellpadding="5" cellspacing="0"
width="100%">
<col width="85*"> <col width="85*"> <col width="85*"> <tbody>
<tr valign="top">
<td width="33%">
<p align="center">(approx.) time/throughput to write 1GB on
/dbase:</p>
</td>
<td width="33%">
<p align="center">Kernel 2.6.20</p>
</td>
<td width="33%">
<p align="center">Kernel 2.6.27</p>
</td>
</tr>
<tr valign="top">
<td width="33%">
<p align="center">Primary/Secondary</p>
</td>
<td width="33%">
<p align="center">~17s. ~60MB/s</p>
</td>
<td width="33%">
<p align="center">~90s. ~11,6 MB/s</p>
</td>
</tr>
<tr valign="top">
<td width="33%">
<p align="center">StandAlone</p>
</td>
<td width="33%">
<p align="center">~11s. ~93MB/s</p>
</td>
<td width="33%">
<p align="center">~77s. ~14MB/s</p>
</td>
</tr>
<tr valign="top">
<td width="33%">
<p align="center">Without drbd</p>
</td>
<td width="33%">
<p align="center">~9s. ~110MB/s</p>
</td>
<td width="33%">
<p align="center">~9s. ~110MB/s</p>
</td>
</tr>
</tbody>
</table>
<p style="margin-bottom: 0cm;" align="center"><br>
</p>
<br>
Read performances test don't show
significative différences between the two kernels.
<br>
<br>
We have 2 IBM x3400 with serveRAID M10
(aacraid driver), 8 processors (2xquadcores), 16Go memory, 2 x1Gb
ethernet card with one dedicated for drbd<br>
one Raid1 for the system one
Raid1 for drbd. <br>
This Raid1 for drbd is composed with 2x 140Go disks
(15trs/mn) (about 130G for partition sdb1 mounted on /dbase and 5G
for sdb2 used for the metadatas.
<br>
<br>
I join the drbd.conf . If you want I can join dmesg and lspci for the 2
kernels<br>
<br>
We have tested drbd-8.0.14 with kernel 2.6.27 on other machines, we
don't find difference with the 2.6.20 kernel. <br>
I really need some help,<br>
<br>
Bests regards<br>
<br>
<u><b>drbd.conf:</b></u><br>
<p style="margin-bottom: 0cm;"></p>
<p style="margin-bottom: 0cm; font-weight: normal;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2">global
{</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">minor-count
4;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">dialog-refresh
5; # 5 seconds</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">#
You might disable one of drbdadm's sanity check.</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">#
disable-ip-verification;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">usage-count
no;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2">}</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2">resource
drbd0 {</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> protocol
C;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> handlers
{</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> pri-on-incon-degr
"/opt/banana/bin/statusmon --alert DEGRADED;
sleep 5 ";</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> pri-lost-after-sb
"/opt/banana/bin/statusmon --alert DEGRADED;
sleep 5 ";</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> split-brain "echo 1 >
/var/lib/alinka_engine/status/split-brain";</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> }</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> startup
{</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> #
Par defaut 0 = attendre infiniment</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> wfc-timeout
3;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> #
Pareil si l'on travaille en mode degrade</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> degr-wfc-timeout
3;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> }</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> </font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> disk
{</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> on-io-error
detach;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> }</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> syncer
{</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> rate
33M;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> al-extents
127;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"><font
face="Courier New, monospace"><font size="2"> }</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">on
morinc1 {</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">device /dev/drbd0;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">disk /dev/sdb1;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">address 192.168.0.1:7788;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">meta-disk
/dev/sdb2[0];</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">}</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">on
morinc2 {</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">device /dev/drbd0;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">disk /dev/sdb1;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">address 192.168.0.2:7788;</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">meta-disk
/dev/sdb2[0];</font></font></p>
<p style="margin-bottom: 0cm;" lang="fr-FR"> <font
face="Courier New, monospace"><font size="2">}</font></font></p>
<p style="margin-bottom: 0cm;"><font face="Courier New, monospace"><font
size="2"><span lang="fr-FR">}</span></font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;">If
I add:</p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR"> <font face="Courier New, monospace"><font size="2">net {</font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR">
<font face="Courier New, monospace"><font size="2"> max-epoch-size
8192;</font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR">
<font face="Courier New, monospace"><font size="2"> max-buffers 8192;</font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR">
<font face="Courier New, monospace"><font size="2"> unplug-watermark
8192;</font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR"> <font face="Courier New, monospace"><font size="2">}<br>
of if I change rate syncer to 100</font></font><br>
</p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;"
lang="fr-FR"> <font face="Arial, sans-serif"><font size="3">this don't
change nothing....</font></font></p>
<p
style="margin-bottom: 0cm; font-weight: normal; text-decoration: none;">
<u><b>lspci (same on the 2 kernel)</b></u><br>
00:00.0 Host bridge: Intel Corporation Server Memory Controller Hub
(rev b1)<br>
00:02.0 PCI bridge: Intel Corporation Server PCI Express x8 Port 2-3
(rev b1)<br>
00:03.0 PCI bridge: Intel Corporation Server PCI Express x4 Port 3 (rev
b1)<br>
00:04.0 PCI bridge: Intel Corporation Server PCI Express x8 Port 4-5
(rev b1)<br>
00:05.0 PCI bridge: Intel Corporation Server PCI Express x4 Port 5 (rev
b1)<br>
00:06.0 PCI bridge: Intel Corporation Server PCI Express x8 Port 6-7
(rev b1)<br>
00:07.0 PCI bridge: Intel Corporation Server PCI Express x4 Port 7 (rev
b1)<br>
00:10.0 Host bridge: Intel Corporation Server Error Reporting Registers
(rev b1)<br>
00:10.1 Host bridge: Intel Corporation Server Error Reporting Registers
(rev b1)<br>
00:10.2 Host bridge: Intel Corporation Server Error Reporting Registers
(rev b1)<br>
00:11.0 Host bridge: Intel Corporation Reserved Registers (rev b1)<br>
00:13.0 Host bridge: Intel Corporation Reserved Registers (rev b1)<br>
00:15.0 Host bridge: Intel Corporation Server FBD Registers (rev b1)<br>
00:16.0 Host bridge: Intel Corporation Server FBD Registers (rev b1)<br>
00:1c.0 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express Root Port 1 (rev 09)<br>
00:1c.1 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express Root Port 2 (rev 09)<br>
00:1d.0 USB Controller: Intel Corporation Enterprise Southbridge UHCI
USB #1 (rev 09)<br>
00:1d.1 USB Controller: Intel Corporation Enterprise Southbridge UHCI
USB #2 (rev 09)<br>
00:1d.2 USB Controller: Intel Corporation Enterprise Southbridge UHCI
USB #3 (rev 09)<br>
00:1d.3 USB Controller: Intel Corporation Enterprise Southbridge UHCI
USB #4 (rev 09)<br>
00:1d.7 USB Controller: Intel Corporation Enterprise Southbridge EHCI
USB (rev 09)<br>
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)<br>
00:1f.0 ISA bridge: Intel Corporation Enterprise Southbridge LPC (rev
09)<br>
00:1f.1 IDE interface: Intel Corporation Enterprise Southbridge PATA
(rev 09)<br>
00:1f.3 SMBus: Intel Corporation Enterprise Southbridge SMBus (rev 09)<br>
01:00.0 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express Upstream Port (rev 01)<br>
01:00.3 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express to PCI-X Bridge (rev 01)<br>
02:00.0 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express Downstream Port E1 (rev 01)<br>
02:01.0 PCI bridge: Intel Corporation Enterprise Southbridge PCI
Express Downstream Port E2 (rev 01)<br>
03:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02)<br>
04:00.0 PCI bridge: Broadcom: Unknown device 0103 (rev c3)<br>
05:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5708
Gigabit Ethernet (rev 12)<br>
15:00.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068E
PCI-Express Fusion-MPT SAS (rev 02)<br>
1a:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721
Gigabit Ethernet PCI Express (rev 21)<br>
1c:04.0 VGA compatible controller: ATI Technologies Inc ES1000 (rev 02)<br>
</p>
<p style="margin-bottom: 0cm;">
</p>
<br>
Antony MARTINEAU a écrit :
<blockquote
cite="mid:OFFDA5CF0B.1CC0F196-ONC1257591.002860C6-C1257591.00290330@lippi.fr"
type="cite"><font face="sans-serif" size="2">Hello we have two
clusters whith 2 nodes
each</font>
<br>
<font face="sans-serif" size="2">One whith SLES10SP2 ( kernel
2.6.16.60-0.34-xen
+ drbd 8.3.1)</font>
<br>
<font face="sans-serif" size="2">One Whith SLES11 (kernel
2.6.27.19-5-xen
+ drbd 8.3.1).</font>
<br>
<font face="sans-serif" size="2">No problem whith performance on both</font>
<br>
<font face="sans-serif" size="2">Your test is not accurate, if you
copy
file, it is suppose there is a FS on drbd devices...</font>
<br>
<font face="sans-serif" size="2">Could you give the speed directly on
block device and after on the drbd device.</font>
<br>
<br>
<font face="sans-serif" size="2">Have you test whith the latest
version
of drbd?</font>
<br>
<table>
<tbody>
<tr>
<td><font face="Arial" size="2">Cordialement,<br>
</font></td>
</tr>
</tbody>
</table>
<br>
<table>
<tbody>
<tr>
<td colspan="2">
<div align="center"><img
src="cid:part1.06020704.08040609@prologue.fr"></div>
</td>
</tr>
<tr>
<td><font face="Arial" size="3"><b>Antony<br>
MARTINEAU</b> </font><font color="#808080" face="Arial" size="2"><br>
Service informatique </font><font color="#808080" face="Arial" size="1"><br>
Technicien Informatique <br>
LIPPI Management </font>
</td>
<td><font color="#004080" face="Arial" size="1">La Fouillouse<br>
16440 Mouthiers sur Boeme<br>
Tel.: 0545673435<br>
Fax: 0545673435<br>
Courriel: </font><a moz-do-not-send="true"
href="mailto:antony.martineau@lippi.fr"><font color="blue" face="Arial"
size="1"><u>antony.martineau@lippi.fr</u></font></a><font color="blue"
face="Arial" size="1"><u><br>
</u></font><a moz-do-not-send="true" href="http://www.lippi.fr/"><font
color="blue" face="Arial" size="1"><u>http://www.lippi.fr</u></font></a><font
color="#004080" face="Arial" size="1">
</font></td>
</tr>
</tbody>
</table>
<br>
<br>
<br>
<br>
<table width="100%">
<tbody>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">De :</font>
</td>
<td><font face="sans-serif" size="1">Lise Didillon
<a class="moz-txt-link-rfc2396E" href="mailto:ldidillon@prologue.fr"><ldidillon@prologue.fr></a></font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">A:</font>
</td>
<td><font face="sans-serif" size="1"><a class="moz-txt-link-abbreviated" href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a></font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Date:</font>
</td>
<td><font face="sans-serif" size="1">06/04/2009 18:38</font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Objet :</font>
</td>
<td><font face="sans-serif" size="1">[DRBD-user] drbd (8.0.14,
8.0.16) very
slow with kernels 2.6.27 to 2.6.29 but ok with kernel 2.6.20</font>
</td>
</tr>
<tr valign="top">
<td><font color="#5f5f5f" face="sans-serif" size="1">Envoyé
par :</font>
</td>
<td><font face="sans-serif" size="1"><a class="moz-txt-link-abbreviated" href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a></font></td>
</tr>
</tbody>
</table>
<br>
<hr noshade="noshade">
<br>
<br>
<br>
<font size="3">Hello,<br>
with drbd-8.0.14 or 8.0.16 on the same machines:<br>
My tests are "copy big files on the replicated device". This
takes for a file 8 seconds. instead of 0.2 seconds without drbd if
kernel version is 2.6.27 or 28 or 29. <br>
but with kernel 2.6.20 there is no performance problem: it
takes sensibly the same time to copy this file if drbd is running or
not.<br>
I alway use the same drbd.conf for these tests.<br>
have you some ideas about why drbd is so slow with kernels 2.6.27 to
2.6.29?<br>
regards,<br>
Lise Didillon<br>
</font>
<br>
<font size="3">-- </font>
<table>
<tbody>
<tr>
<td>
<table width="100%">
<tbody>
<tr>
<td width="61%"><font face="Verdana" size="3"><b>Lise
DIDILLON</b></font><font color="#a2a2a2" face="Verdana" size="3"><br>
Ingénieur d'études, Ligne Produit UseIT</font>
</td>
<td width="38%">
<div align="right"><a moz-do-not-send="true"
href="mailto:lise.didillon@prologue.fr"><font color="#a2a2a2"
face="Verdana" size="3">lise.didillon@prologue.fr</font></a></div>
</td>
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<td align="left"><font class="nom">Lise DIDILLON</font><br>
<font class="fonction">Ingénieur d'études, Ligne Produit
UseIT</font></td>
<td align="right" valign="bottom"><a
href="mailto:lise.didillon@prologue.fr" class="mail">lise.didillon@prologue.fr</a></td>
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<td width="150"> <a href="http://www.prologue.fr"
target="_blank"> <img src="cid:part3.03040103.00000603@prologue.fr"
alt="logo prologue" border="0" height="58" width="120"></a> </td>
<td class="adresse"> ZA de Courtaboeuf<br>
12 Avenue des Tropiques<br>
BP 73 - 91 943 Les Ulis Cedex </td>
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<td class="tel">Tél :</td>
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<td class="num">+33 1 69 29 39 39</td>
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<td class="tel">Fax :</td>
<td width="10"> </td>
<td class="num">+33 1 69 29 90 43</td>
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