Doubts about RAC infraestructure with one disk array

Hello everybody,
I'm writing to you because we have a doubt about the correct infrastructure to implement RAC.
Please, let me first explain the current design we are using for Oracle DB storage. Currently we are running several standalone instances in several servers, all of them connected to a SAN disk storage array. As we know this is a single point of failure we have redundant controlfiles, archiveds and redos both in the array and in the internal disk of each server, so in case array completely fails we “just” need to recover nightly cold backup, apply archs and redos and everything it's ok. This can be done because we have standalone instances and we can assume this 1 hour downtime.
Now we want to use these servers and this array to implement a RAC solution and we know this array is our single point of failure and wonder if it's possible to have a multinode RAC solution (not RAC One Node) with redundant controlfiles/archs/redos in internal disks. Is it possible to have each node writing full RAC controlfiles/archs/redos in internal disks and apply these files consistently when the ASM filesystem used for RAC is restores (i.e. with a softlink in an internal disk and using just one node)? Or maybe the recommended solution is to have a second array to avoid this single point of failure?
Thanks a lot!

cssl wrote:
Or maybe the recommended solution is to have a second array to avoid this single point of failure?Correct. This is the proper solution.
In this case you can also decide to simply use striping on both arrays, then mirror array1's data onto array2 using ASM redundancy options.
Also keep in mind that redundancy is also need for the connectivity. So you need at least 2 switches to connect to both arrays, and dual HBA ports on each server, with 2 fibres running, one to each switch. You will need multipath driver s/w on the server to deal with the multiple I/O paths to the same storage LUNs.
Likewise you need to repeat this for your Interconnect. 2 private switches, 2 private NICs on each server that are bonded. Then connect these 2 NICs to the 2 switches, one NIC per switch.
Also do not forget spares. Spare switches (one each for storage and Interconnect). Spare cables - fibre and whatever is used for the Interconnect.
Bottom line - not a cheap solution to have full redundancy. What can be done is to combine the storage connection/protocol layer with the Interconnect layer and run both over the same architecture. Oracle's Database Machine and Exadata Storage Servers do this. You can run your storage protocol (e.g. SRP) and your Interconnect protocol (TCP or RDS) over the same 40Gb Infiniband infrastructure.
Thus only 2 Infiniband switches are needed for redundancy, plus 1 spare. With each server running a dual port HCA and a cable to each of these 2 switches.

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$CRS_HOME/oui/bin/runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES=prd_node2"
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linux "/"
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jan 18 12:24:23 wione systemd-journal[189]: Journal stopped
-- Reboot --
Since I have used Xubuntu without hassle for several years, I first thought the problem may be related to systemd reboot and something in my system setup. But I have tried the Fedora 17 live CD and rebooting there works as expected. So, since it works in one systemd distro, it should work with Arch as well.
Then I thought that it maybe had something to do with the raid-array, something along the lines of
https://bugzilla.redhat.com/show_bug.cgi?id=752593
https://bugzilla.redhat.com/show_bug.cgi?id=879327
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Unfortunately I'm out of ideas. Any help would be grateful.
Last edited by wingbrant (2013-02-02 22:20:20)

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scal-racdg-rg host1 No Online
host2 No Online
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I want to install winXP to my iMAC running Lion OS. I will use BootCamp. My winXP uses 2 disks with XP on one CD and SP2 on the other. Bootcamp seems to say use a one disk version.   What can I do about this paradox?

     I want to install winXP on my iMac. It has OS 10.7.2 and uses a 27" display. I will use Bootcamp and create a separate partion for winXP. Bootcamp instructions call for a single disk winXP CD with Service Pack 2 on it. My version has winXP on one disk and Service pack 2 on another. Will this be a problem? If it is, is there a solution?
                                                                        Tnx...K6jpj

If you just bought an iMac a week ago new, it WILL NOT support XP unless XP is inside a virtual machine. End of story. You will need Windows 7 if you plan to run Windows natively on any Mac in 2011.
Used models will run XP, though--from the Intel inception in '06 through the middle part of 2010.
However, consider that Microsoft wants XP gone--and badly so--even as it is extending security hotfix support through April 2014. This gives you two years and four months before you have to throw down for whatever's current at that time.
Windows 7 will give you a much better experience (dare I say more Mac-like?) than XP, as it seems to be better organized. The Taskbar, for instance, has become more like the OS X Dock in that you can "pin" things to it in a straightforward manner, unlike XP's seldom-used Quick Launch traybar.
7's also built to take advantage of all the snazzy new hardware you now have.
But don't let me sell it to you. It's really your call.
Nate

Doubts about RAC infraestructure with one disk array

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