（原创）RHCS + GNBD实现基于multipath上的GFS文件系统

gl00ad

I finished reading part I, excellent! exactly what I am looking for.

There is something wrong here:

开发者特意在官方文档中提到了gnbd的multipath功能，而没有提到iscsi也能实现multipath

Changes to GFS 6.1 for RHEL4 U2

   This release supports iSCSI and multipath iSCSI. That is, device mapper
   multipath (dm-multipath) can use iSCSI.
   
   This release prevents the activation of snapshots in a clustered volume
   group.
   
   
Important Notes
   
   Multipath GNBD is not available with this and previous releases of  
   Red Hat GFS 6.1. That is, device mapper multipath (dm-multipath)
   cannot use GNBD. GNBD without multipath *is* available.

[ 本帖最后由 gl00ad 于 2008-10-25 06:52 编辑 ]

gl00ad

如果我有硬件光纤存储设备去实现multipath，有真实服务器，你认为我会用vmware和iscsi去模拟环境吗？
Do not worry, you will have them eventually, just keep going.

gl00ad

[root@gnbdclient1 ~]# cat /etc/multipath.conf
blacklist {
         devnode "sda"
}

[root@rh4cluster1 ~]# multipath -v2
create: SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1
[size=33 GB][features="0"][hwhandler="0"]
Chapter 3. Setting Up DM-Multipath
12
\_ round-robin 0
\_ 0:0:0:0 sda 8:0 [---------

/etc/multipath.conf

blacklist {
wwid SIBM-ESXSST336732LC____F3ET0EP0Q000072428BX1
}

from redhat DM-Multipath -- best practice

Although you could
blacklist the sda device using a devnode type, that would not be safe procedure since
/dev/sda is not guaranteed to be the same on reboot. To blacklist individual devices, you
can blacklist using the WWID of that device

.

[ 本帖最后由 gl00ad 于 2008-10-29 09:48 编辑 ]

gl00ad

I know LVS use pulse as heartbeat to monitor status of active LVS node, what does RHCS CMAN use as heartbeat?

I read all the document I have, I cannot seem able to find it, so there is no separate heartbeat package? is it just a hello message from CMAN?


I did see you mentioned it on the graph but none at texts. there are so many people here asking for how to install heartbeat, keepalive etc, it really confuse me.

Thanks

[ 本帖最后由 gl00ad 于 2008-10-30 05:08 编辑 ]