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<DIV><FONT face=Arial size=2>Hi ,</FONT></DIV>
<DIV><FONT face=Arial size=2>Im trying to figure out what is the best way to
recover a failed OST , basicly we have 10 OST's</FONT></DIV>
<DIV><FONT face=Arial size=2>each has DRBD + HA on top of raid 6 so its kind of
redundent and suppose to be solid</FONT></DIV>
<DIV><FONT face=Arial size=2>just want to notice for the other post that asked
of that configuration that its working ok and the</FONT></DIV>
<DIV><FONT face=Arial size=2>performance is fairly ok considering that
redundency is more important then full speed of the cluster at list in
this case .</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regarding the backup strategy , we make a client
backups to tapes of all the important stuff</FONT></DIV>
<DIV><FONT face=Arial size=2>and also a seperate backup of the OST files only to
a USB HD (daily on each OST)</FONT></DIV>
<DIV><FONT face=Arial size=2>that backup is made possible by mounting the OST
with -t ldiskfs insted of lustre the by running rsync to the USB HD</FONT></DIV>
<DIV><FONT face=Arial size=2>so the main thing i dont understand is if an OST
failed as in hardware problem then </FONT></DIV>
<DIV><FONT face=Arial size=2>to avoid full file system recovery from tapes there
is a need to restore the OST only data from the USB drive or tapes</FONT></DIV>
<DIV><FONT face=Arial size=2>to the new OST , then the lustre procedure
e.g</FONT></DIV>
<DIV><FONT face=Arial size=2>e2fsck -n -v --mdsdb /tmp/ostdb
/dev/{ostdev}</FONT></DIV>
<DIV><FONT face=Arial size=2>on all OST's then</FONT></DIV>
<DIV><FONT face=Arial size=2>lfsck -n -v ............. /mnt/mainfs</FONT></DIV>
<DIV><FONT face=Arial size=2>the only things i see possibly is to write zero
holes on files that were changed for example seens the last backup </FONT></DIV>
<DIV><FONT face=Arial size=2>of the OST file system itslef with rsync to the USB
drive or tapes</FONT></DIV>
<DIV><FONT face=Arial size=2>so baicly what will happen to a mysql table file
that has inconcitency on its tripes</FONT></DIV>
<DIV><FONT face=Arial size=2>how is possible to restore it the best way possible
, i realize that it must suffer some kind of data lose</FONT></DIV>
<DIV><FONT face=Arial size=2>but its better then loading the entire lustre file
system backup wich will take days is some cases .</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks for any help .</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
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