[linux-lvm] Is there a maximum for LV?
Jose Luis Domingo Lopez
linux-lvm at 24x7linux.com
Tue Dec 9 13:27:02 UTC 2003
On Tuesday, 09 December 2003, at 09:29:05 -0500,
Yanick Quirion wrote:
> On the past I was using lvm 1.1rc2. For an unknown reason, the version is not anymore available.
> But with this version, when I do a "vgdisplay" I was able to saw the LV Max Size:
>
> How I'm testing LVM2. The field "MAX LV Size" is not there anymore. Is this means that LV doesn't have a maximum?
>
>From vgcreate(8):
-s, --physicalextentsize PhysicalExtentSize[kKmMgGtT]
Sets the physical extent size on physical volumes of this volume
group. A size suffix (k for kilobytes up to t for terabytes) is
optional, megabytes is the default if no suffix is present.
Values can be from 8 KB to 16 GB in powers of 2. The default of
4 MB causes maximum LV sizes of ~256GB because as many as ~64k
extents are supported per LV. In case larger maximum LV sizes
are needed (later), you need to set the PE size to a larger
value as well. Later changes of the PE size in an existing VG
are not supported.
So it seems you have a 255 GiB limit on LV sizes with your LVM2 setup. This
same limitation is what applies to LVM2 Logical Volumes, and the math is
simple to do.
Greetings.
--
Jose Luis Domingo Lopez
Linux Registered User #189436 Debian Linux Sid (Linux 2.6.0-test10-mm1)
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