LVM2 full disk & Grub
When I was going to install a full-disk LVM2 PV on my hard disk (not for the root partition) with grub installed, I had very bad experience. I searched the internet for possible warnings. All I got were 1. LVM1 was known to be "unfriendly" to boot loader when the full disk is created as one PV. and 2. LVM2 solves this problem by allowing the label sector to be any of the first 4 sectors in the disk.
However, grub needs more than 3 sectors (in my system, 16 sectors), which still conflicts with LVM2 when the full disk is used. So if you happen to want to use LVM2 and grub in the same disk, you have to create some partitions... NOT the full disk.
I don't know why I couldn't find this kind of information on the internet or grub manual or LVM howto. In case there are also other users as "careless" as me, my this post might be useful.
By the way, is there an LVM2 howto available somewhere?
--Ling
Quoted 1 line · Ling Li
By the way, is there an LVM2 howto available somewhere?
Work is in progress to add lvm2 information into the LVM HOWTO. I hope to have it published in the next few days. If you have anything that you feel should really be in it (such as this grub issue) let me know.
Thanks,
Signature · 11 lines
AJ Lewis Voice: 612-638-0500 Red Hat Inc. E-Mail: [email protected] 720 Washington Ave. SE, Suite 200 Minneapolis, MN 55414 Current GPG fingerprint = FE77 4B43 6A9B F982 A731 02FA 2BF5 7574 294A AA5A Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... -----Begin Obligatory Humorous Quote---------------------------------------- geep! -----End Obligatory Humorous Quote------------------------------------------
Quoted 1 line · Ling Li
However, grub needs more than 3 sectors (in my system, 16 sectors),
The number 4 is a compile time parameter - you could make it bigger if you wanted to.
lib/label/label.h: #define LABEL_SCAN_SECTORS 4L
I wonder if it's sensible to add an offset parameter, so it skips the first X sectors, or if it could recognise grub.
Quoted 1 line
By the way, is there an LVM2 howto available somewhere?
Not yet. But we've just started to update the existing HOWTO to cater for LVM2.
Alasdair
Signature · 1 line
[email protected]
Hi,
Could you please tell how can I get the draft HowTo of LVM2? Thanks
Regards.
-Lu, Jian
Quoted 32 lines
-----�ʼ�ԭ��-----
������: [email protected] [mailto:[email protected]] ���� AJ Lewis ����ʱ��: 2004��2��13�� 7:31
�ռ���: [email protected]
����: Re: [linux-lvm] LVM2 full disk & GrubQuoted 1 line · Ling Li
By the way, is there an LVM2 howto available somewhere?
Work is in progress to add lvm2 information into the LVM HOWTO. I hope to have it published in the next few days. If you have anything that you feel should really be in it (such as this grub issue) let me know.
Thanks,
Signature · 13 lines
AJ Lewis Voice: 612-638-0500 Red Hat Inc. E-Mail: [email protected] 720 Washington Ave. SE, Suite 200 Minneapolis, MN 55414 Current GPG fingerprint = FE77 4B43 6A9B F982 A731 02FA 2BF5 7574 294A AA5A Grab the key at: http://people.redhat.com/alewis/gpg.html or one of the many keyservers out there... -----Begin Obligatory Humorous Quote---------------------------------------- geep! -----End Obligatory Humorous Quote------------------------------------------
Quoted 2 lines · AJ Lewis
Work is in progress to add lvm2 information into the LVM HOWTO. I hope to have it published in the next few days. If you have anything that you feel
Cool! Thanks for your work. A new comer like me really needs such an updated manual (though the one for LVM1 is still very useful).
Quoted 1 line
should really be in it (such as this grub issue) let me know.
Sure, I will if I have more.
--Ling