Brian - I noticed that things ran much smoother when kernel hacking -> kernel debug -> Force gcc to inline functions marked 'inline' was checked. Also, load the dm-raid4-5 module with modprobe - Eric >-----Original Message----- >From: dm-devel-bounces@xxxxxxxxxx [mailto:dm-devel-bounces@xxxxxxxxxx] On >Behalf Of Wood, Brian J >Sent: Thursday, March 29, 2007 10:04 AM >To: device-mapper development >Subject: Question about using dmraid45 patch > >Hello, I'm new to the dm-devel mail list, so hopefully my question won't >get flamed too badly :) > >I need some help with a setup issue in dmraid, specifically raid5. I'm >trying to use Heinz Mauelshagen's patch for dmraid45 and having problems >getting it to compile in the kernel (or as a module). It's been a number >of years since I've worked with Linux, so I might be missing something >blatantly easy. > >I have downloaded the source for both 2.6.18.1 (which the patch >specifically applies to) and 2.6.18.8 which RHEL5 uses. When I used the >2.6.18.8 kernel I applied the patch, I copied the .config over from the >kernel directory, and used "menu gconfig" to active (as a module) the >dmraid45 in device mapper under device drivers. I compiled the kernel, >copied over the files, edited grub and rebooted into the new >kernel...all seemed to go fine. I rebooted again when into the OPROM and >setup a raid5 volume (I have the system loaded onto a raid0 volume; the >system has 5 SATA disks total). After booting back into the new kernel I >ran the command "dmraid -tay" to list my active tables (I hope that's >the right way to describe it) and got: > >[root@localhost ~]# dmraid -tay >isw_dfbhbdaedb_Volume0: 0 312592896 striped 2 256 /dev/sda 0 /dev/sdb 0 >isw_bffiiabjc_Volume1: 0 312592896 raid45 core 2 65536 nosync raid5_la 1 >128 3 -1 /dev/sdc 0 /dev/sdd 0 /dev/sde 0 >isw_dfbhbdaedb_Volume01: 0 1108422 linear >/dev/mapper/isw_dfbhbdaedb_Volume0 63 >isw_dfbhbdaedb_Volume02: 0 2104515 linear >/dev/mapper/isw_dfbhbdaedb_Volume0 1108485 >isw_dfbhbdaedb_Volume03: 0 309379770 linear >/dev/mapper/isw_dfbhbdaedb_Volume0 3213000 > >I then tried to activate the volumes and got: > >[root@localhost ~]# dmraid -ay >RAID set "isw_dfbhbdaedb_Volume0" already active >ERROR: device-mapper target type "raid45" not in kernel > >I then used lsmod to see if my module was active and saw this: >[root@localhost ~]# lsmod | grep -e "dm" >dm_snapshot 48824 0 >dm_zero 35200 0 >dm_mirror 46976 0 >dm_log 42496 1 dm_mirror >dm_mod 92880 17 dm_snapshot,dm_zero,dm_mirror,dm_log > >nothing to do with raid5. > >I ran insmod and got the error:: >[root@localhost ~]# insmod >/lib/modules/2.6.18.1/kernel/drivers/md/dm-raid4-5.ko >insmod: error inserting 'drivers/md/dm-raid4-5.ko': -1 Unknown symbol in >module > >I wanted to do a test at this point to see if it might be the kernel >.config file I had from the RHEL5 2.6.18.8 release, so I used a fresh >drop of kernel 2.6.18.1 (the one listed inside the patch code), applied >the dmraid45 patch, and used "make gconfig" to configure the kernel. I >went into device drivers and unselected everything except device mapper >support and the new subcategory of RAID4/5 target to be inserted as part >of the kernel. I even unselected Loadable Module Support just to make >sure :) >I then set make to use -d to get a little more info on the error, here's >what it showed when trying to compile: > > > Successfully remade target file `drivers/md/xor.o'. > Pruning file `FORCE'. > Finished prerequisites of target file `drivers/md/built-in.o'. > Must remake target `drivers/md/built-in.o'. >Putting child 0x006bc870 (drivers/md/built-in.o) PID 30056 on the chain. >Live child 0x006bc870 (drivers/md/built-in.o) PID 30056 > LD drivers/md/built-in.o >drivers/md/dm-mem-cache.o: In function `pl_elem': >/usr/src/kernels/linux-2.6.18.1/drivers/md/dm-mem-cache.h:18: multiple >definition of `pl_elem' >drivers/md/dm-raid4-5.o:/usr/src/kernels/linux-2.6.18.1/drivers/md/dm-m e >m-cache.h:18: first defined here >Reaping losing child 0x006bc870 PID 30056 >make[2]: *** [drivers/md/built-in.o] Error 1 >Removing child 0x006bc870 PID 30056 from chain. >Reaping losing child 0x00697ed0 PID 29856 >make[1]: *** [drivers/md] Error 2 >Removing child 0x00697ed0 PID 29856 from chain. >Reaping losing child 0x006c4de0 PID 26812 >make: *** [drivers] Error 2 >Removing child 0x006c4de0 PID 26812 from chain. > > >Is there something I'm not setting in the build environment to build >this as part of the kernel or as a module? I looked in the raid4-5 >readme.txt and it just says to apply the patch and have device mapper >installed (which RHEL5 does). I'm using gnu make version 3.81, gcc >version 4.1.1, and the version of RHEL5 is x86_64 (I've also tried this >same operation with i386). As something else to add I've tried this >entire operation with OpenSuSE 10.2 for x86_64 and i386. > > > >Thank you for the help, > >Brian Wood >Intel Corporation >Digital Enterprise Group >Manageability & Platform Software Division >brian.j.wood@xxxxxxxxx > >-- >dm-devel mailing list >dm-devel@xxxxxxxxxx >https://www.redhat.com/mailman/listinfo/dm-devel > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
