On Wed, Mar 20, 2002 at 04:04:54PM +0530, ASHISH GUPTA wrote:
> 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?
Yes.
That array is meant to name all devices, which don't show up in
/proc/partitions. In addition to that you need to define a LVM device type
(which is already there) in liblvm.h and a case to declare NBD as
non-partitioned devices in lvm_check_partitioned_dev.c (which is already done).
So you inserted the only missing definition which made it work :-)
Regards,
Heinz -- The LVM Guy --
>
> 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
>
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*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***
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Heinz Mauelshagen Sistina Software Inc.
Senior Consultant/Developer Am Sonnenhang 11
56242 Marienrachdorf
Germany
Mauelshagen@Sistina.com +49 2626 141200
FAX 924446
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