On Thu, 18 Sep 2014 18:17:28 -0700, Mark Phillips <[email protected]> wrote: > Josiah, > > Thanks for your response. It looks as if LVM is using the hardware directly
Yes, it looks like LVM is directly using the hardware indeed. The Ubuntu Desktop installer does not include RAID support nor install mdadm by default. You can get mdadm by doing sudo apt-get install mdadm from the command-line. In fact, Ubuntu would have said so if you tried running mdadm without using sudo. It's not smart enough, though, to recommend such things via sudo. The real problem is that both hard drives are allocated as independent physical volumes to LVM giving you twice the space you would normally have. I also noticed that you have all of the volume group entirely allocated to one physical volume. That kind of negates any benefit to using LVM as live volumes can't be shrunk. Most benefits of LVM like taking live snapshots or creating new volumes on the fly require that there is some unallocated space in the volume group. There is a way to restore RAID without reinstalling, but it's a long, complicated procedure. I recommend to reinstall and use the Ubuntu Server ISO. Set up RAID and LVM as you see fit. Once Server is finished installing, just install the ubuntu-desktop package (or kubuntu-desktop, xubuntu-desktop, etc.) and you will have a normal desktop. Ubuntu Desktop is actually based on the standard Server install plus everything ubuntu-desktop pulls in. sudo apt-get install ubuntu-desktop > - > > mark@tsunami:~$ sudo pvscan -v > [sudo] password for mark: > Wiping cache of LVM-capable devices > Wiping internal VG cache > Walking through all physical volumes > PV /dev/sda1 VG vg1_tsunami lvm2 [931.51 GiB / 0 free] > PV /dev/sdb1 VG vg1_tsunami lvm2 [931.51 GiB / 0 free] > Total: 2 [1.82 TiB] / in use: 2 [1.82 TiB] / in no VG: 0 [0 ] > mark@tsunami:~$ > > Part of my confusion is that mdadm is NOT installed on my system. > Everything I have read about raid involves mdadam, but as I said in my > original post, it is not installed - > mark@tsunami:~$ sudo mdadm > sudo: mdadm: command not found > mark@tsunami:~$ > > However, in the Ubuntu 14.04 server installer I specifically set up the > drives to be in a raid1 array. From the instructions I followed (see > reference above) > > - Designate your new partition for RAID by selecting “Physical volume > for RAID” at the “How to use this partition:” prompt. This process will > create a new RAID device. > Repeat the previous step for the other physical disk. > - Here’s the overview of my partition layout and settings: (mine looked > the same, but the drives are 1 TB Samsung drives. > > - > > At the prompt asking, “Write the changes to disks and configure LVM?” > Select yes. > > I then entered the LVM process, finished the installation, picked a few > packages including ubuntu-desktop, and as I said above it boots just fine. > > What should I do now? > > I could do a re-install, but the steps won't change, so I am not confident > I will get a RAID1 array out of it. > > Or, I could install mdadm and see what it says.....but can a software raid > be installed without mdadm? If the system is magically configured as a raid > array, will installing mdadm screw it up? > > I don't believe this laptop has any raid hardware installed....at least > System76 never told me about it, and I asked them to configure the drives > as RAID1 when I bought the beast and they said they could not do that. > > Thanks, > > Mark > > On Thu, Sep 18, 2014 at 3:45 PM, Josiah Luscher <[email protected]> > wrote: > >> Finally a question I might be able to help with! I'm so excited! I can >> think of many ways to get more information to help alleviate the >> confusion. I'd suggest starting with an LVM scan of physical volumes: >> "pvscan -v". That will tell you weather LVM is using 'md#' devices, or >> the hardware directly ('sd#' devices). You could also query the hard >> drives with mdadm for RAID headers. I think the command would be " mdadm >> --query /dev/sd#. >> >> >> On September 18, 2014 1:28:23 PM PDT, Mark Phillips < >> [email protected]> wrote: >> >I am confused about a RAID1 and LVM installation using Ubuntu 14.04 >> >server. >> >I have a new System 76 Gazelle Pro laptop with two 1 TB SSD drives. I >> >re-installed the system using the server version of 14.04 so I could >> >have >> >the installer create the raid and lvm. I followed this blog post - >> >http://blog.miketoscano.com/?p=307, and the steps in the installer to >> >create the raid and then the lvm, and then install the OS, and it all >> >seemed to work. I then installed the ubuntu-desktop and then the >> >system76 >> >drivers. It all seems to be working. >> > >> >However, I cannot find mdadm. It does not appear to be installed. I >> >looked >> >at /etc/fstab and I see >> >mark@tsunami:~$ cat /etc/fstab >> ># /etc/fstab: static file system information. >> ># >> ># Use 'blkid' to print the universally unique identifier for a >> ># device; this may be used with UUID= as a more robust way to name >> >devices >> ># that works even if disks are added and removed. See fstab(5). >> ># >> ># <file system> <mount point> <type> <options> <dump> <pass> >> >/dev/mapper/vg1_tsunami-root / ext4 errors=remount-ro 0 1 >> >/dev/mapper/vg1_tsunami-swap none swap sw 0 0 >> > >> >And the free space shows >> >mark@tsunami:~$ df -h >> >df: ‘/run/user/107/gvfs’: Permission denied >> >Filesystem Size Used Avail Use% Mounted on >> >/dev/mapper/vg1_tsunami-root 1.8T 120G 1.6T 7% / >> >none 4.0K 0 4.0K 0% /sys/fs/cgroup >> >udev 7.8G 4.0K 7.8G 1% /dev >> >tmpfs 1.6G 1.2M 1.6G 1% /run >> >none 5.0M 0 5.0M 0% /run/lock >> >none 7.8G 144K 7.8G 1% /run/shm >> >none 100M 40K 100M 1% /run/user >> > >> >There is no mdadm.conf. >> >]mark@tsunami:~$ sudo locate mdadm >> >[sudo] password for mark: >> >/usr/share/bash-completion/completions/mdadm >> > >> >And mdstat does not seem correct from what I have read. >> >]mark@tsunami:~$ cat /proc/mdstat >> >Personalities : >> >unused devices: <none> >> > >> >Am I missing something? Do I really have what I intended to install? I >> >don't want to pull all my files over to the machine until I am sure it >> >is >> >working as intended. >> > >> >Thanks, >> > >> >Mark >> >_______________________________________________ >> >PLUG mailing list >> >[email protected] >> >http://lists.pdxlinux.org/mailman/listinfo/plug >> >> -- >> Sent from my Android device with K-9 Mail. Please excuse my brevity. >> _______________________________________________ >> PLUG mailing list >> [email protected] >> http://lists.pdxlinux.org/mailman/listinfo/plug >> > _______________________________________________ > PLUG mailing list > [email protected] > http://lists.pdxlinux.org/mailman/listinfo/plug _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
