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<DIV align=left><SPAN class=234593113-01082008><FONT face=Arial color=#0000ff size=2>Most hard drives ship with write-cache
enabled.</FONT></SPAN></DIV>
<DIV align=left><SPAN class=234593113-01082008><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV align=left><SPAN class=234593113-01082008><FONT face=Arial color=#0000ff size=2>When using decent raid controllers its best to turn off the
write(back) cache on hard drives. In our testing it makes no difference anyway
with a good card.</FONT></SPAN></DIV>
<DIV align=left><SPAN class=234593113-01082008><FONT face=Arial color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV align=left><SPAN class=234593113-01082008><FONT face=Arial color=#0000ff size=2>Its possible your lost data was in hard drive
cache.</FONT></SPAN></DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> drbd-user-bounces@lists.linbit.com
[mailto:drbd-user-bounces@lists.linbit.com] <B>On Behalf Of </B>Mark
Eisenblaetter<BR><B>Sent:</B> 01 August 2008 14:22<BR><B>To:</B>
drbd-user@lists.linbit.com<BR><B>Subject:</B> [DRBD-user] Mysql on DRBD: Cache
Problem?<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Hi List,<BR><BR>I'm trying to run a DRBDMySQL Cluster (Active/Passive)
with Replication for easier backup.<BR><BR>My problem ist that after a
hardkill from the master(Powerkill) the slave misses binlog
positions.<BR><BR>After disable the Arraycontroller Write cache its reduced
from 100k to 16k Position but that not enough.<BR><BR>I run DRBD with Protocal
C and the minimal max-buffer of 32k.<BR><BR>Is there any cache i miss? Or
somthing else?<BR><BR>Mark<BR><BR><BR>setup: 2x HP DL360G5 whit raid 10 and
Gigabit network for drbdsync only. <BR><BR>-- <BR>Mark
Eisenblätter<BR>Geissendoerfer & Leschinsky GmbH<BR><A href="http://www.gl-sytemhaus.de">www.gl-sytemhaus.de</A><BR></DIV></BLOCKQUOTE></BODY><!--[object_id=#titaninternet.co.uk#]--><FONT face=Tahoma size=2><FONT color=#0000ff>
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