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[[Category:Fedora ARM Secondary Architecture]][[Category:Winter 2010 SBR600]]= iSCSI Goal =
iSCSI is SCSI (Small Computer System Interface) block device support over Internet (TCP/IP). It's basically a way of doing a storage area network (SAN) using $20/port gigabit ethernet instead of $3000/port FibreChannel connections.
This may be a useful technology for providing storage to the [[Fedora ARM Secondary Architecture/ARM hardware|ARM hardware]] devices in the build farm without attaching eSATA disks to each machine. The goal, then, was to determine if iSCSI was suitable for this application.
= Kernel =
To test iSCSI on the [[http://zenit.senecac.on.ca/wiki/index.php/Fedora_ARM_Secondary_Architecture/OpenRD-Client|OpenRD-Client]] system, a new kernel was required, with iSCSI support built-in or in modular form:
* Kernel sources: the upstream kernel does not have OpenRD-Client support (though it does support the OpenRD-Base). Patched source obtained from git://repo.or.cz/linux-2.6/linux-2.6-openrd.git -- see discussion at http://groups.google.com/group/openrd/browse_thread/thread/6ec7b4b39700e114
* Cross-compiled on [[CDOT Development Systems|CDOT workstation]] HongKong using the [[:fedora:Architectures/ARM/CrossToolchain|AM cross-development toolchain]] available at http://fedora-arm.wantstofly.org/cross/
* Config file used: http://hongkong/chris/openrd-iscsi-kernel/openrd-iscsi-kernel-2.6.33-rc8.config.txt
Results:
* Kernel: http://hongkong/chris/openrd-iscsi-kernel/uImage-2.6.33-rc8
* Modules: http://hongkong/chris/openrd-iscsi-kernel/modules-2.6.33-rc8.tgz
= Results =
iSCSI seems to work. , but only to a point:* We can login to an initiator (netbsd-iscsi package on HongKong x86_64), however.* However, under heavy load (first noticed when creating a mock buildroot cache), the target receives invalid opcodes, causing the connection to fail. ** Experimenting with a <code>/proc/cpu/alignment</code> value of 3 (fixup+warn) did not clear the issue. ** Using the exact same target with a F12 x86_64 initiator is successful.
