To lvm or not to lvm

[Michael Butash]

I've been doing md+luks+lvm for a long time, and really find no complaints
moving from spinners, to sata ssd, to nvme m.2.  SSD leveling seems less an
issue in modern samsung and others that auto-level, otherwise I'd love them
one a year, at best, but not so much lately with 950+ gen samsung m2's.  My
laptop is a single toshiba m2 1tb and is doing great with out active trim
features enabled.

Here's my basic setups for systems, using both a laptop and my desktop,
both with m2 disks, but laptop with factory windoze, and desktop native
linux with all efi disabled.  This is no different than my sata
spinners/ssd, just replace nvme0n*p* with sd*.

Laptop (xps15 9560) retains the factory windoze partition as well as a
hidden dell restore partitions (3-4), next boot, luks spv0, and rest
pv/vg/lvm for ubuntu, but mapping /boot/EFI still for upgrades:

host# lsblk
NAME                    MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
nvme0n1                 259:0    0 953.9G  0 disk
├─nvme0n1p1             259:1    0   499M  0 part  /boot/efi
├─nvme0n1p2             259:2    0   128M  0 part
├─nvme0n1p3             259:3    0 131.5G  0 part
├─nvme0n1p4             259:4    0   834M  0 part
├─nvme0n1p5             259:5    0   499M  0 part  /boot
├─nvme0n1p6             259:6    0 808.1G  0 part
│ └─spv0                    253:0    0 808.1G  0 spv0
│   ├─host--vg0-root0   253:1    0    17G  0 lvm   /
│   ├─host--vg0-swap0   253:2    0     4G  0 lvm   [SWAP]
│   ├─host--vg0-var0    253:3    0     6G  0 lvm   /var
│   ├─host--vg0-varlog0 253:4    0     3G  0 lvm   /var/log
│   ├─host--vg0-home0   253:5    0    90G  0 lvm   /home
└─nvme0n1p7             259:7    0    12G  0 part

Vs. my dual-nvme disk desktop system like setup under arch I use normally,
legacy boot without efi wonkyness:

host# lsblk
nvme0n1                                         259:0    0   477G  0 disk
├─nvme0n1p1                                     259:1    0     1G  0 part
│ └─md0                                           9:0    0  1023M  0 raid1
/boot
└─nvme0n1p2                                     259:2    0   476G  0 part
  └─md1                                           9:1    0 475.8G  0 raid1
    └─spv0                                      253:0    0 475.8G  0 crypt
      ├─host--vg0-swap0                      253:1    0     2G  0 lvm
      ├─host--vg0-root0                      253:2    0    22G  0 lvm   /
      ├─host--vg0-var0                       253:3    0    10G  0 lvm   /var
      ├─host--vg0-varlog0                    253:4    0     3G  0 lvm
/var/log
      ├─host--vg0-home0                      253:5    0    80G  0 lvm
/home
nvme1n1                                         259:3    0   477G  0 disk
├─nvme1n1p1                                     259:4    0     1G  0 part
│ └─md0                                           9:0    0  1023M  0 raid1
/boot
└─nvme1n1p2                                     259:5    0   476G  0 part
  └─md1                                           9:1    0 475.8G  0 raid1
    └─spv0                                      253:0    0 475.8G  0 crypt
      ├─host--vg0-swap0                      253:1    0     2G  0 lvm
      ├─host--vg0-root0                      253:2    0    22G  0 lvm   /
      ├─host--vg0-var0                       253:3    0    10G  0 lvm   /var
      ├─host--vg0-varlog0                    253:4    0     3G  0 lvm
/var/log
      ├─host--vg0-home0                      253:5    0    80G  0 lvm
/home\

Desktop hardware is a precision 7910 desktop with 2x pcie 8x to dual m2
slot drives, with currently 2x samsung 950 pro 512gb's in it.

Both are working well, and haven't seem to throw any smart alerts to die in
about 2 years now on each.

New samsung m.2 970 evo's are out now, as are pro's probably shortly too -
I'd buy em if refreshing.  I've filled up my 512's in raid0, almost lust my
laptop's 1tb, but otherwise added some odd/old 256/512gb ssd's for my kvm
vm's to run on for bulk pig windoze server instances and fortinet/other
appliances.

-mb


On Thu, Sep 20, 2018 at 4:14 PM Mark Phillips <mark at phillipsmarketing.biz>
wrote:

> Do you recommend installing Ubuntu 18.04 on an lvm (ie selecting that
> option when installing) in a dual boot with Windows 10 scenario?
>
> My thought is if the Ubuntu setup works well on my Surface Pro 4, is
> stable, etc. then I would use the lvm to nuke the Windows partition and
> Windows recovery partition and absorb them into the Ubuntu partition.
>
> Will that work?
>
> Thanks,
> Mark
>
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