Date: Tue, 06 Dec 2005 10:40:36 -0600 From: Eric Anderson <anderson@centtech.com> To: hackers@freebsd.org Cc: Nate Lawson <nate@root.org> Subject: scsi-target and the buffer cache Message-ID: <4395BF04.50101@centtech.com>
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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 -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology Anything that works is better than anything that doesn't. ------------------------------------------------------------------------
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