Re: LVM creation methods
thanks it is very clear,
yes, i am using the second disk just for storage purpose. so i am not
worried about the booting since it is already been handled via
/dev/sdb
so no issues for me.
Thanks both Meike and Darac
On Fri, Jul 20, 2012 at 5:53 PM, Darac Marjal <mailinglist@darac.org.uk> wrote:
> On Fri, Jul 20, 2012 at 05:35:03PM +0500, Muhammad Yousuf Khan wrote:
>> i was reading a document where a person has configured physical volume
>> and didn't use fdisk
>> he just directly created the partition by "pvcreate /dev/sda"
>>
>> and there are some documents which shows the utilization of fdisk and
>> converting sda1 to "8e" type which is LVM.
>>
>> so the question is what is the difference b/w creating it directly on
>> disk by pvcreate command and by using fdisk.
>
> With one, you're using the whole disk, with the other, you're using a
> portion of the disk. If you want to use the disk with non-LVM-aware
> operating systems, then you'll need to partition the disk and give them
> a partition. Bear in mind that "non-LVM-aware" probably includes your
> BIOS, too, so a whole-disk PV is unbootable.
>
> That said, if you only want to use that disk for LVM, then there is no
> issue with using the whole disk. In fact, for Advanced Format disks and
> SSDs, it may be preferable as you're more likely to get the alignment
> right on them.
>
>>
>> actually i have just created the partition via direct command
>> "pvcreate /dev/sda" it is fully functionally and i can use it as a
>> partition but when i fdisk -l /dev/sda it shows that the disk is
>> empty. so i am worried that is it the proper way to do it or else i
>> may not end up with consequences.
>
> fdisk only reads (as far as I'm aware) PC-style partition tables. If it
> says the disk is empty, what it's saying is that there's no partition
> table there. If you had a GPT on there, you'd likely get the same
> message (actually, newer versions DO detect GPT and print a complaint).
>
> Use the right tools for the job. If you have a partition table, read it
> with fdisk. If you have a PV on there, use LVM tools.
>
>
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