Dm-crypt / LVM install issue [SOLVED]

--SOLVED--
Jeez.. I've been doing encryption and lvm for a long time.. I can't believe I had a brain fart on the install.. LOL
Well, I didn't think I'd need to ask for help this quick after coming back to Arch.. LOL
But....
I'm attempting to install an encrypted/LVM system.
For some reason, I'm getting a busy fs error "Can't open /dev/sda2 exclusively. Mounted filesystem?", when I attempt my pvcreate.
I've done the following:
1) partitioned my drive: /dev/sda1 as unencrypted /boot of 256MB and /dev/sda2 as LVM type for the rest of the disk.
2) then I did my cryptsetup for sda2 (cryptsetup -c aes-xts-plain -y -s 512 luksFormat /dev/sda2)
3) then open the vol (cryptsetup luksOpen /dev/sda2 root)
Then I attempt my pvcreate (lvm pvcreate /dev/sda2) and get the error above. I must be forgetting something, does anyone have any idea?
Thanks!!
Last edited by jackmetal (2009-11-05 18:14:23)

the installer has built-in support for lvm/dm_crypt btw. the advantage of doing it like that is that fstab, rc.conf, mkinitcpio.conf etc will be adjusted accordingly automatically.

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Hello,
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And then I read that the BIOS installation for GPT is supposed to be done before you install Arch Linux. Whoops! So can I fix this without having to reinstall Arch? I can probably mount all of my directories and chroot inside again after creating the BIOS partition so GRUB can be configured and reinstalled correctly. Maybe I can fix this. I don't know.
So I am trying to troubleshoot this problem, but is there anything I am understanding wrongly here? Is there some other reason why GRUB won't boot up? I tried Super GRUB 2 disk and that didn't work, there was just a blank screen when booting from grub.cfg. Any help or suggestions?
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Last edited by mrrhq (2012-11-08 22:31:49)

mrrhq wrote:In my partition layout I have a 400MB boot (extra room for other kernels). followed by an LVM volume, which has one volume group with 4 logical partitions, these are: /, /home, /tmp, and /var.
Be aware that logical partitions are a construct of the Master Boot Record (MBR) partitioning system; however, the title of your thread, and some of the specifics, suggest that you're using the GUID Partition Table (GPT) system, which doesn't use logical partitions. If you're certain you used gdisk or cgdisk, and not fdisk or cfdisk, then you're using GPT and I'd simply accept your use of the word "logical" as an error. If there's any doubt in your mind about this, though, you should investigate further, since some of the issues and solutions depend greatly on which partitioning system you used.
That I'm supposed to have a "BIOS partition". This is interesting because I have no idea what this is for.
The BIOS Boot Partition holds a portion of the GRUB code. It's used on GPT disks but not on MBR disks -- on MBR, the equivalent code goes in an officially-unallocated area immediately after the MBR. The BIOS Boot Partition can sometimes be just a few kibibytes in size, but it's usually either 1MiB or 2MiB. (I've seen reports that some configurations now require over 1MiB, but I haven't investigated this claim.)
Something came to mind when I was using cgdisk or gdisk, it would automatically allocate the first 2000-ish sectors (instead of 34 like the documentation was hinting), so this probably means something.... I don't know.
No, these are unrelated issues. Most partitioning tools today, including gdisk and its siblings, align all partitions on 2048-sector (1MiB) boundaries so as to avoid performance penalties that can be incurred on Advanced Format disks, SSDs, and some types of RAID arrays. See this article I wrote on the topic some time ago.
That said, if you have nowhere else to put it, you could try creating a BIOS Boot Partition in that space. You'd need to change the alignment policy in gdisk or cgdisk to align on 1-sector boundaries to do so, although an 8-sector alignment would be safer for future changes if you've got an Advanced Format disk. The BIOS Boot Partition isn't really greatly affected by the alignment issues, so I wouldn't worry about leaving it unaligned. OTOH, if GRUB wants more then 1MiB on your system, this space would be too small, so it might be better to resize a partition to make room for the BIOS Boot Partition.
WonderWoofy wrote:From what I understand (I have not tried this though) grub2 is actually lvm aware. So you can put all partitions within the lvm, including boot. If this is the case, I see no reason why you would not also be able to put the 2MB bios boot partition in there as well.
GRUB 2 is LVM-aware, and it is possible to put your Linux /boot directory inside the LVM. If you want to do this, though, there's really no point to split /boot off into a separate logical volume (the LVM equivalent of a partition); you might as well just make it a normal directory off of the root (/) filesystem. I'm pretty sure it is not possible to put the BIOS Boot Partition inside the LVM. That's because the code to parse the LVM data structures is contained within the BIOS Boot Partition, thus creating a chicken-and-egg situation if you were to attempt it. Furthermore, the code to write to the BIOS Boot Partition looks for the partition type code in the disk's partition table, and there's no equivalent to that in the LVM data structures. (All this said, in principle you might be able to get something like this to work, but the result would be something similar, but not identical, to a BIOS Boot Partition.)
Although GRUB 2 can read a kernel from within an LVM, I still prefer to keep a separate /boot partition. The reason is that you might not always use GRUB 2. If you wanted or needed to switch to another boot loader in the future, it might not be LVM-aware, and might need /boot to be on a true partition, not in an LVM. (This is true of every EFI boot loader except for GRUB 2, for instance.) In fact, I routinely create two or three smallish partitions on my computers so that I can create multiple /boot partitions for multi-boot configurations or to help transition to a new installation should the need arise. This can help simplify things when the time comes to start fresh.

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Dm-crypt / LVM install issue [SOLVED]

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