I had a similar problem once upon a time (1.0.1rc4) with LVM over software RAID. The fix here was to tell LVM that the device type did not support partitions. The source file is tools/lib/lvm_check_partitioned_dev.c >From what I see however (lines 62 through 66), in 1.0.3 devices that are known not be partitioned are: LVM_DEVICE_TYPE_NBD LVM_DEVICE_TYPE_LOOP LVM_DEVICE_TYPE_MD LVM_DEVICE_TYPE_ATARAID 1.0.2 used the same list but it went into the source code sometime after 1.0.1rc4. I don't know when exactly. In other words, what version of LVM userland are you using? My guess is you should be fine with 1.0.3. Hope that helps. Yves -----Original Message----- From: linux-lvm-admin@sistina.com [mailto:linux-lvm-admin@sistina.com]On Behalf Of ASHISH GUPTA Sent: Wednesday, March 20, 2002 11:35 AM To: linux-lvm@sistina.com Subject: [linux-lvm] Does LVM work with NBD? Hi All, 1) I'm using NBD and LVM . I have mounted the remote device using NBD(version 2.4.27). When I do pvcreate on mounted disk,it is successful. #pvcreate /dev/nb0 pvcreate -- physical volume "/dev/nb0" successfully created But when we try out other commands such as pvdisplay, vgcreate etc. it gives the following error. #pvdisplay /dev/nb0 pvdisplay -- ERROR "pv_read(): pv_create_name_from_kdev_t" no VALID physical volume "/d ev/nb0" # ./vgcreate /dev/nb0 vgcreate -- please enter physical volume name(s) pvcreate uses the information from /proc/partitions. It works although the /proc/partitions is not updated with the remote device information. However the other LVM commands like "vgcreate", "pvdisplay" look for remote device information in /proc/partition and as the entry is not there in dir_cache, it fails. To make it run, I have added a entry for nb0 in the file lvm_dir_cache.c in _noprocdir. /* devices *not* showing up in /proc/partitions must be scanned anyway */ static char *_noprocdir[] = { LVM_DIR_PREFIX "loop", LVM_DIR_PREFIX "nb0", NULL }; After doing,I am able to do pvcreate, vgcreate and so.Is it right way to do this? 2)As per some mail in lvm-linux archieve, if I make an entry for nbd device in _devdir[] in file lvm_dir_cache.c and just modify this following check by replacing _cache_size with '1'.Still pvcreate fails.And it gives the following error. if(!_cache_size) _scan_devs( TRUE); else _scan_devs( FALSE); } # pvcreate /dev/nb0 "/dev/nb0 has a partition table" 3) Is there any patch available to make NBD working with LVM? Regards, Ashish _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
