Date: Mon, 13 Feb 2012 09:55:36 -0600 From: Kevin Day <toasty@dragondata.com> To: freebsd-fs@freebsd.org Subject: Simultaneous read-only snapshot mount Message-ID: <A14E351F-9C8C-4239-9ECD-E84F3BBFD9D5@dragondata.com>
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It's now possible/somewhat common for the ability to have two systems can see the same disk(s) at the same time (through iSCSI or storage systems that support dual controllers, etc). Suppose system A has a filesystem mounted RW, and takes a snapshot. Can system B access that snapshot via a read only mount, while system A continues to read/write to that filesystem? Or more basically, is everything needed to read a snapshot stable/unchanging enough that a second system can read from it while the filesystem is still being updated? -- Kevinhelp
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