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Here is what I can find about the topic. Perhaps it is some useful info.
RDS is now included in the Linux kernel ... Currently supported transports include TCP sockets and IB Verbs Reliable Connected connections ... RDS/IB listens for incoming connections on port 18634. RDS uses RDMA private connect parameter data, both when initiating and accepting a connection.
RDS over IB is supported .... Oracle only supports InfiniBand HCA with Mellanox chip set
You will probably need to install rds-tools:
# yum info rds-tools
Various tools for support of the RDS API. RDS is specific to InfiniBand and iWARP networks and does not work on non-RDMA hardware.
Using RDS over InfiniBand:
What is RDS RDMA?
More related references including InfiniBand, RDMA and RHEL 6 from the IBM site:
Thanks. Been messing about with it on a dev servers that have HCAs and wired to an IB switch.
rds-tcp loads on top of the rds kernel module - which seems to indicate pure IP NIC implementation. (also caused a hard kernel reset when running a ping - target server crashed without so much as an error in the kernel log)
rds-rdma loads on top of the ib-core kernel module - indicating RDS over IB via RDMA (Remote Direct Memory Access) protocol. Same layer that the scsi IB protocol (SRP) runs via.
But not planning at the moment to look any further at this weekend... all work and no play makes one a dull boy. ;-)
Got rds to work properly on Oracle Linux 5.9.
The driver stack looks as follows:
The problem I ran into was this:
rds // RDS module rds_rdma // Infiniband driver and not IP driver rdma_cm // RDMA connection manager ib_core // Infiniband Core module
Really messes up modprobe and results (in my case) in over 19,000 modprobe processes and unknown symbol errors. Fix was to simply comment out this instruction.
[root@... ~]# cat /etc/modprobe.d/rds.conf install rds /sbin/modprobe --ignore-install rds && /sbin/modprobe rds_tcp && /sbin/modprobe rds_rdma
There are like a range of RPM dependencies that will result in additional package to be automatically installed.
Oracle support recommended the following to me (kind of includes the kitchen sink too ;-) ):
# yum install opensm opensm-devel opensm-libs opensm-static openib ibutils ibutils-devel ibutils-libs infiniband-diags libcxgb3 libcxgb3-libs libibcm libibcm-devel libibcm-static libibcommon libibcommon-devel libibcommon-static libibmad ibibmad-devel libibmad-static libibumad libibumad-devel libibumad-static libibverbs libibverbs-devel libibverbs-static libibverbs-utils libipathverbs libipathverbs-static libmlx4 libmlx4-static libmthca libmthca-static librdmacm librdmacm-devel librdmacm-static ibrdmacm-utils libsdp mstflint perftest qlvnictools qperf srptools tvflash ibnes ibnes-static
As mentioned, ran into issues doing a modprobe rds_rdma - and I've found the +/etc/modprobe.d/rds.conf+ to be the culprit.
I have experienced the same thing and have an open service request with Oracle about this.
This has occurred to me 3 times when upgrading from an existing 5.8 to 5.9.
After update and reboot, modprobe runs thousands of times until the server runs out of memory and won't contine.
If something comes from my SR I'll see if I can update again.
The original error message with modprobe generating 19,000 errors and running the system out of memory is a race condition in the boot loader.
I've created an SR for this issue and have a patched RPM from oracle support. There is a fairly simple work around. Let me dig up my SR.
There is a conflict between rds.conf and ofa-2.6.32-300.32.2.el5uek.conf.
remove any one of them, boot will works well.
It seems the "alias rds rds_rdma" make "install rds" run failure.
I use RDS for high performance Oracle RAC clusters.