Comments on: Coraid Odyssey: Part 6 (sata_mv hotplug) http://www.pixelchaos.net/2008/04/29/coraid-odyssey-part-6-sata_mv-hotplug/ random bits for your terminal Thu, 02 Feb 2012 05:31:49 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: jcl http://www.pixelchaos.net/2008/04/29/coraid-odyssey-part-6-sata_mv-hotplug/comment-page-1/#comment-642 jcl Sat, 13 Sep 2008 12:00:58 +0000 http://www.pixelchaos.net/?p=52#comment-642 Mark, I have had no such problems with the Seagate Barracuda ES.2 drives (ST31000340NS). In fact, the only small issue I've seen with this whole rig at all is related to the immaturity of the sata_mv driver (I think). Even under kernel 2.6.26-1-686 in Debian 5.0 (Lenny) I occasionally see drives that have just been hot plugged hit a performance cap of about 13MB/s. If you simply wait several minutes the issue seems to go away and the drives start performing at a more normal 110MB/s or so. I suppose it is possible that the issue is actually caused by something in the firmware of the ES.2 drives and Linux/sata_mv just deals with it better than Plan9 on the Coraid boxes? Mark,

I have had no such problems with the Seagate Barracuda ES.2 drives (ST31000340NS). In fact, the only small issue I’ve seen with this whole rig at all is related to the immaturity of the sata_mv driver (I think).

Even under kernel 2.6.26-1-686 in Debian 5.0 (Lenny) I occasionally see drives that have just been hot plugged hit a performance cap of about 13MB/s. If you simply wait several minutes the issue seems to go away and the drives start performing at a more normal 110MB/s or so.

I suppose it is possible that the issue is actually caused by something in the firmware of the ES.2 drives and Linux/sata_mv just deals with it better than Plan9 on the Coraid boxes?

]]> By: Mark http://www.pixelchaos.net/2008/04/29/coraid-odyssey-part-6-sata_mv-hotplug/comment-page-1/#comment-640 Mark Sat, 13 Sep 2008 06:13:18 +0000 http://www.pixelchaos.net/?p=52#comment-640 I would be interested to hear how you ST31000340NS disks went over time, as Coraid have reports of issues with them just stopping. A hot unplug/replug apparently brings them back to life. I would be interested to hear how you ST31000340NS disks went over time, as Coraid have reports of issues with them just stopping. A hot unplug/replug apparently brings them back to life.

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