[gentoo-user] Re: Raid5 not assembled after boot
On Saturday 19 April 2008, Roy Wright wrote: Looking thru dmesg and /var/log/messages, it looks like there are no attempts to start the array until I manually try. Any hints on what I'm missing? Personal experience: 1) don't mix raidtools stuff with mdadm, use only the latter (I'm not saying you used raidtools, but I found a lot of misleading documentation lying around) 2) check carefully the UUID of *all* the partitions, I had exactly the same issue, that I discovered to be caused by a leftover partition that was part of a different raid set (spurious UUID). At some point in the bootup the correct set were disassembled. 3) evms can badly intefere with mdadm (or it was LVM?): try to modify a partition/raid setup and it always appears busy, preventing any editing. HTH Francesco -- Linux Version 2.6.24-gentoo-r4, Compiled #2 PREEMPT Wed Apr 2 08:07:24 CEST 2008 One 1GHz AMD Athlon 64 Processor, 2GB RAM, 2004.03 Bogomips Total aemaeth -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] Re: Raid5 not assembled after boot
Francesco Talamona wrote: On Saturday 19 April 2008, Roy Wright wrote: Looking thru dmesg and /var/log/messages, it looks like there are no attempts to start the array until I manually try. Any hints on what I'm missing? Personal experience: 1) don't mix raidtools stuff with mdadm, use only the latter (I'm not saying you used raidtools, but I found a lot of misleading documentation lying around) 2) check carefully the UUID of *all* the partitions, I had exactly the same issue, that I discovered to be caused by a leftover partition that was part of a different raid set (spurious UUID). At some point in the bootup the correct set were disassembled. 3) evms can badly intefere with mdadm (or it was LVM?): try to modify a partition/raid setup and it always appears busy, preventing any editing. Thank you. I only used mdadm following the gentoo.org docs and gentoo-wiki howtos. Just confirmed all three drives and the mdadm.conf UUID's are the same. evms not installed. lvm2 not installed. yet. I think I found the answer in the man page: --auto-detect Request that the kernel starts any auto-detected arrays. This can only work if md is compiled into the kernel -- not if it is a module. Arrays can be auto-detected by the kernel if all the components are in primary MS-DOS partitions with partition type FD. In-kernel autodetect is not recommended for new installations. Using mdadm to detect and assemble arrays -- possibly in an initrd -- is substantially more flexible and should be preferred. Basically it seems that I need to add a mdadm --assemble --scan to a startup file. Thanks again! Have fun, Roy -- gentoo-user@lists.gentoo.org mailing list
