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тАО05-02-2011 02:18 AM
тАО05-02-2011 02:18 AM
Create Striped lv on VG having different size disks?
I am having a vg containg 6 disks. Five 100GB disks and One 200GB disks.
Is it possible for me to create an striped lv on this vg using all PE ?
Manoj K
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тАО05-02-2011 05:52 AM
тАО05-02-2011 05:52 AM
Re: Create Striped lv on VG having different size disks?
Hope this helps!
Regards
Torsten.
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тАО05-02-2011 10:54 AM
тАО05-02-2011 10:54 AM
Re: Create Striped lv on VG having different size disks?
I think what he's saying is that yes you can build striped LVs across this but eventually you will have 600GB of striped LVs and 100GB of free space on your 200GB disk.
-klb
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тАО05-10-2011 04:58 AM
тАО05-10-2011 04:58 AM
Re: Create Striped lv on VG having different size disks?
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тАО05-10-2011 06:01 AM
тАО05-10-2011 06:01 AM
Re: Create Striped lv on VG having different size disks?
While running a lvcreate am getting the following error.
#lvcreate -l 5594 -i 6 -I 128 -n lvol1 vg03
Warning: rounding up logical volume size to extent boundary at size "716544" MB for striping.
Logical volume "/dev/vg03/lvol1" has been successfully created with
character device "/dev/vg03/rlvol1".
lvcreate: Not enough free physical extents available.
Logical volume "/dev/vg03/lvol1" could not be extended.
Run the "lvextend" command to create space on the Logical Volume.
Please assist whether there is anything extra needed in the command.
Manoj K
Manoj K
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тАО05-10-2011 06:08 AM
тАО05-10-2011 06:08 AM
Re: Create Striped lv on VG having different size disks?
# vgdisplay -v /dev/vg03
But if one of the disks is already full (no free PEs left), you cannot do this striping anymore.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО05-10-2011 06:16 AM
тАО05-10-2011 06:16 AM
Re: Create Striped lv on VG having different size disks?
First Problem:
Depends upon what the volume group's first disk was during creatation. If the first disk was the 200GB disk then n/p. If the 100GB disk then this is what the vg sets it boundaries too. The only way to change this is to destroy the vg and create a new vg stating that the 200 GB disk in the first position.
Second Problem:
Stripping writes PV1 PV2 / PV2 PV1. So eventually you'll hit the 100GB ceiling and be left with 100GB unused on the 200GB PV. And LVM will stop at this point since there is no way for LVM to revert back to writing contiguous.
Comment: I don't know who is advising you to use this obsolete procedure, AKA Software Raid Zero. But there is absolutely no advantage to it in any way, especially in administration or fault tolerance. For you to have fault tolerance you'd have to create a pvgroup of the disks and then mirror the group to another group of the same number of disks, hence raid 01.
Most disk arrays do this for with much less effort and much better performance.
Do not expect better performance. In many years of hearing others report on this configuration no has ever reported better performance. Why? Added O/S overhead.
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тАО05-11-2011 05:48 AM
тАО05-11-2011 05:48 AM
Re: Create Striped lv on VG having different size disks?
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тАО05-11-2011 06:26 AM
тАО05-11-2011 06:26 AM
Re: Create Striped lv on VG having different size disks?
<< Comment: I don't know who is advising you to use this obsolete procedure, AKA Software Raid Zero
How can you say that raid0 is an obsolete procedure.I have vraid 1 in EVA and that luns are presented to my server. So again i need to do mirroring (raid1) in OS level?
<
So you are saying that there is no performance adavance in raid0 compared to raid1.
This is the first time i am hearing raid0 obsolete and there is no advantage for raid0 over raid1.
Anyway i am planning to unpresent the 200GB disk and split it in to 2 *100GB disk in eva. Present both disks to the host and create lv with stripe (raid0).
Manoj K
Manoj K
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тАО05-11-2011 06:35 AM
тАО05-11-2011 06:35 AM
Re: Create Striped lv on VG having different size disks?
Hope this helps!
Regards
Torsten.
__________________________________________________
There are only 10 types of people in the world -
those who understand binary, and those who don't.
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No support by private messages. Please ask the forum!
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