Thanks for all the hints. There were no udev-rules on the computers, so I fixed the problem using Neil's hints: 'echo "AUTO -all" >> /etc/mdadm.conf'. Cheers, Stefan P.S.: as the "auto assemble everything with 0xfd partition type" may become destructive at times (I have to deal a lot with damaged arrays), I'd suggest not to make it the default setting. But the other side is: most people who set up a RAID would want to have it this way, so I guess it's my duty to make sure no autoassembly on my technicians' computers happens, unless I tell mdadm to do so... P.P.S.: The behaviour might very well have come with the update to mdadm-3.1.4, which may well have come nearly in parallel with me updating the kernels... (as Gentoo stable jumped from 3.0 to 3.1.4 in late October, at the beginning of November I updated the kernels...) Am 03.12.2010 02:30, schrieb Neil Brown: > On Thu, 2 Dec 2010 22:16:25 +0100 Mario 'BitKoenig' Holbe > <Mario.Holbe@xxxxxxxxxxxxx> wrote: > >> Stefan /*St0fF*/ Hübner <stefan.huebner@xxxxxxxxxxxxxxxxxx> wrote: >>> Now I have the effect that upon plugging in drives that formerly were >>> part of an array, the md_mod modules gets loaded and tries to >>> auto-assemble arrays. This disturbs the diagnosis. >>> I've tried raid=noautodetect as kernel commandline, and I grepped the >>> source for the MODULE_PARM_DESC macro, which yielded no (useful) result. >>> This "automagic" behaviour happens since 2.6.36. >> Are you sure this autodetection is triggered by the module? >> And are you sure this behaviour is bound to this specific kernel >> version? >> >> In-Kernel auto-assembly is usually not active when md is compiled as >> module. Probably in your case this is some udev-triggered assembly? > s/usually not/never/ > > With a sufficiently recent mdadm, you can put > AUTO -all > > in mdadm.conf to disable auto-assembly. > > Alternately, find the udev rule (/lib/udev/rules.d/64-md-something) and > comment out the bit where it runs "mdadm -I" or "mdadm --incremental". > > NeilBrown > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
