Date: Mon, 25 Oct 2010 21:04:24 GMT From: arundel@FreeBSD.org To: dynamic-wind@mail.ru, arundel@FreeBSD.org, freebsd-bugs@FreeBSD.org Subject: Re: kern/140752: [ata] [patch] [shutdown] HDD power-off procedure is not clean Message-ID: <201010252104.o9PL4OVE017334@freefall.freebsd.org>
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Synopsis: [ata] [patch] [shutdown] HDD power-off procedure is not clean State-Changed-From-To: analyzed->patched State-Changed-By: arundel State-Changed-When: Mon Oct 25 20:44:55 UTC 2010 State-Changed-Why: Patched in HEAD (r214279). Please note: This fixes the spindown issue only for ATA devices running under CAM with ATA_CAM enabled. Fixing it for the ATA subsystem will require much more work, since ATA in general has problems with power management. Since the ATA subsystem will very likely become legacy software in the near future there are no plans porting these changes to it. There are plans of reworking mavs original spindown patch (r203420) at some point in the future so non-ATA devices will benefit from it too. However for this to happen the CAM subsystem needs some intensive improvement. For now this commit poses an efficient way of preventing ATA hdds from dying early due to exessive emergency head unloads/parks. http://www.freebsd.org/cgi/query-pr.cgi?pr=140752
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