Doh.....I should have waited for your email before re-installing! However after several hours and a rescue disk, I got it back to where it was before. Whew!
Michael, thanks for the information! While re-installing I read about how mdadm has been incorporated into LVM, and how it has progressed to the point where it is as good or better than LVM over mdadm. Very cool. And yes, I have the 'm' attribute. Next test...remove the boot drive and see if it still boots up! Mark On Fri, Sep 19, 2014 at 7:37 AM, Michael Ewan <[email protected]> wrote: > You should not need to re-install. LVM2 handles the RAID configuration > directly and does not need to use MD. Try checking with "sudo lvdisplay > -C", you should see an 'm' (mirrored) under the Attr column indicating > RAID1. Look at the man page for lvs(8) to see what the rest of the > attributes mean. For future reference, "pvdisplay" will show you all the > physical volumes on the system (you should have two); "vgdisplay -v" will > show you the volume groups, logical volumes in that group and associated > physical volumes; "lvdisplay -v" will show you all of your logical > volumes. The only reason you would need to use md is to set up physical > devices for LVM2 using multipath on dual port SCSI, or a Fibre Channel > array with dual controllers. > > On Thu, Sep 18, 2014 at 10:39 PM, Larry Brigman <[email protected]> > wrote: > > > If you did install raid1, then the installer didn't figure out that you > > needed to include the mdadm > > package. Also in raid1, either drive would show the same info if things > > were correctly configured. > > Loading the mdadm package and querying the drives will show you that > info. > > > > Your link about setting up raid is valid. It just doesn't say anything > > about what packages should be installed. > > > > On Thu, Sep 18, 2014 at 9:05 PM, Mark Phillips < > [email protected] > > > > > wrote: > > > > > Loren, > > > > > > Thanks for you comments. As I said in my first post, I used ubuntu > > server > > > to install both raid and lvm, and then installed ubuntu-desktop. The > > image > > > in my second post is from the text based ubuntu server installation > > > process. > > > > > > I guess I could try it again, but I don't see how anything would > change. > > > > > > Thanks, > > > > > > Mark > > > On Sep 18, 2014 8:54 PM, "Loren M. Lang" <[email protected]> > wrote: > > > > > > > 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 > > > > > > > _______________________________________________ > > > 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 > _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
