Date: Sun, 11 Jan 2009 21:33:31 -0500 From: Graham Todd <gtodd@bellanet.org> To: freebsd-fs@freebsd.org Subject: RE: iscsi client hangs performing I/O on a dead target Message-ID: <496AABFB.4060404@bellanet.org>
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Hi, I believe the FreeBSD foundation is supporting development that may help with this (the "Safe Removal of Active Disk Devices" project)? The focus is on USB devices since, as noted in the newsletter, "[t]he removable USB disk causing a crash turns out to be our #1 reported bug." :-) Hopefully the work can be useful in a generic way since panics induced by disappearing USB devices are easier to control than those caused by disappearing network storage. cheers, From: http://www.freebsdfoundation.org/press/2008Dec-newsletter.shtm ... [snip] ... The first project to get off the ground is to make FreeBSD tolerate the removal of active disk devices, such as when a USB flash device with a mounted filesystems is physically detached by a user. Currently the system may panic in this situation. The work involves adding proper reference counting to strategic portions of the kernel and modifying filesystems to properly handle "device lost" errors. Edward Tomasz Napierala is the developer working on this project. ...
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