[linux-lvm] Re: lvm partition on ramdisk

Larry Dickson ldickson at cuttedge.com
Mon May 12 20:05:37 UTC 2008

Continuing this frustration: I read in the pvcreate doc that you could tell
it to use a whole disk (instead of a partition). So I tried "pvcreate
/dev/ram0". With or without zeroing the disk, and with or without "--force",
and with any blocksize (1024, 2048, or 4096), the result is always the same:

  Device /dev/ram0 not found (or ignored by filtering).

I know /dev/ram0 is there; fdisk sees it. Is there any way to turn off the

Larry Dickson

On 5/12/08, Larry Dickson <ldickson at cuttedge.com> wrote:
> Hi all,
> I'm trying to set up a logical volume over a 256MB ramdisk and a 1TB raid
> array partition. My ramdisk (set up in grub.conf with ramdisk_size=262144
> ramdisk_blocksize=4096) fails to make a type 8e partition either in fdisk or
> sfdisk. The error in fdisk is
> WARNING: Re-reading the partition table failed with error 22: Invalid
> argument.
> The kernel still uses the old table.
> The new table will be used at the next reboot.
> And, of course, after the next reboot, my ramdisk data will be gone.
> Can anyone give me some guidance here? Is it choking on the 4K blocksize?
> I wanted that for efficiency, as suggested by MrMichaelWill on his blog,
> but his base case seems to be a file system mounted directly on the
> unpartitioned device, and I need LVM.
> TIA,
> Larry Dickson
> Cutting Edge Networked Storage
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