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тАО10-24-2013 03:32 AM
тАО10-24-2013 03:32 AM
maximum size of a LV which we can create in LVM 2.x
Hi Team,
Could you please tell me any particular limitation is there for maximum size of a LV whichi we can create in LVM 2.x
I knew that in LV 1.0 max size of and LV will be 65535*PE size
In one of our HPUX 11.31 server we had created vg with version 1.0 . But now we need to extend a LV above 1Tb. Because of the limitation of LM 1.0 we are not able to do this.
So we are planning to change the vgversion to 2.x using the command and after that we are trying to extend the LV above 1 Tb.
Whether this plan will work ? Please provide your valid suggetions on this.
Regards
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тАО10-24-2013 03:35 AM - edited тАО10-24-2013 03:37 AM
тАО10-24-2013 03:35 AM - edited тАО10-24-2013 03:37 AM
Re: maximum size of a LV which we can create in LVM 2.x
The maximum size of a LVOL is
2TB in 11.11
16TB in 11.23 (patched ) and 11.31 with LVM 1,
256TB in 11.31 for LVM 2.
google
"HP-UX LVM Supported Limits"
Hope this helps!
Regards
Torsten.
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тАО10-24-2013 03:40 AM
тАО10-24-2013 03:40 AM
Re: maximum size of a LV which we can create in LVM 2.x
But now in our server which we are using LVm 1.0 we are not able to increase the LV above 1Tb . The PE size which we are using there is 16MB
Regards
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тАО10-24-2013 03:47 AM - edited тАО10-24-2013 03:48 AM
тАО10-24-2013 03:47 AM - edited тАО10-24-2013 03:48 AM
Re: maximum size of a LV which we can create in LVM 2.x
Yes, with this extends size 1TB is the limit (assuming you use a single PV).
extends size can be up to 256MB.
Hope this helps!
Regards
Torsten.
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тАО10-24-2013 03:57 AM
тАО10-24-2013 03:57 AM
Re: maximum size of a LV which we can create in LVM 2.x
>> The PE size which we are using there is 16MB...
This PE Size is very small and therefore you cannot extend the lvol beyond 1TB.
You should use PE Size = 64 or 128.
However, you cannot change the PE Size on an existing VG. This requires creating a new VG and then moving all the data from the old VG to the new VG, or backup the existing data, then recreate the VG with the new PE Size.
This is a warning to alll sysadmins -- never use the default PE Size (4 MB) unless you know the VG will never be more than a few GB. Always specify a large PE Size (32, 64, 128 or 256) for any VG that will grow. At 11.31, the vgmodify command can adjust some of the VG limits but not PE Size.
Bill Hassell, sysadmin
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тАО10-24-2013 04:01 AM - edited тАО10-24-2013 04:01 AM
тАО10-24-2013 04:01 AM - edited тАО10-24-2013 04:01 AM
Re: maximum size of a LV which we can create in LVM 2.x
LVM limits WP attached (this is a PDF, please rename it).
Hope this helps!
Regards
Torsten.
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тАО10-24-2013 04:01 AM
тАО10-24-2013 04:01 AM
Re: maximum size of a LV which we can create in LVM 2.x
Thanks for the reply , Now i am using the vgversion 1.0 if i am changing the vg version to 2.2 then can i overcome this restriction.
My plan is
1)umount the current lv
2)deactivate the vg
3)use the command vgversion to change the version to 2.2
4)activate vg
5)mount lv
6)extend the lv above 2TB
Is this will work ?
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тАО10-24-2013 04:03 AM
тАО10-24-2013 04:03 AM
Re: maximum size of a LV which we can create in LVM 2.x
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО10-24-2013 12:52 PM
тАО10-24-2013 12:52 PM
Re: maximum size of a LV which we can create in LVM 2.x
This command is useful in answering the original question:
# lvmadm -t
For example:
# lvmadm -t --- LVM Limits --- VG Version 1.0 Max VG Size (Tbytes) 510 Max LV Size (Tbytes) 16 Max PV Size (Tbytes) 2 Max VGs 256 Max LVs 255 Max PVs 255 Max Mirrors 2 Max Stripes 255 Max Stripe Size (Kbytes) 32768 Max LXs per LV 65535 Max PXs per PV 65535 Max Extent Size (Mbytes) 256 VG Version 2.0 Max VG Size (Tbytes) 2048 Max LV Size (Tbytes) 256 Max PV Size (Tbytes) 16 Max VGs 512 Max LVs 511 Max PVs 511 Max Mirrors 5 Max Stripes 511 Max Stripe Size (Kbytes) 262144 Max LXs per LV 33554432 Max PXs per PV 16777216 Max Extent Size (Mbytes) 256 VG Version 2.1 Max VG Size (Tbytes) 2048 Max LV Size (Tbytes) 256 Max PV Size (Tbytes) 16 Max VGs 2048 Max LVs 2047 Max PVs 2048 Max Mirrors 5 Max Stripes 511 Max Stripe Size (Kbytes) 262144 Max LXs per LV 33554432 Max PXs per PV 16777216 Max Extent Size (Mbytes) 256 VG Version 2.2 Max VG Size (Tbytes) 2048 Max LV Size (Tbytes) 256 Max PV Size (Tbytes) 16 Max VGs 2048 Max LVs 2047 Max PVs 2048 Max Mirrors 5 Max Stripes 511 Max Stripe Size (Kbytes) 262144 Max LXs per LV 33554432 Max PXs per PV 16777216 Max Extent Size (Mbytes) 256 Min Unshare unit(Kbytes) 512 Max Unshare unit(Kbytes) 4096 Max Snapshots per LV 255
-Bob
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