I'm curious about whether a target mode device would use the buffer
cache or not. Here's a scenario:
Host A: has fibre channel host adapter, in target mode, large memory
pool, and another fiber channel host adapter connecting to fibre channel
block device.
Host B: Fibre channel host adapter, connecting to Host A. 'sees' the
target mode block device created by Host A.
Will Host A use the buffer cache to cache blocks between the real block
device, and the shared target mode device?
What about if Host A put a filesystem on the block device, created a
single file the size of the filesystem, and shared that filesystem via a
target mode device to Host B?
What I'm wanting is a box (FreeBSD?) that can be placed between a fibre
channel block device (like a RAID array), and a fibre channel host using
that block device, and act as a block cache for that device, using the
FreeBSD's memory. If it had a significant amount of memory, this could
be very useful.
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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