On Fri, Jan 2, 2015 at 11:57 AM, Bob Proulx <b...@proulx.com> wrote: > Kevin O'Gorman wrote: > > There's one remaining question I have, which is fortunately not urgent. > > It's not clear what I'm going to have to do to bring the RAID online > after > > a reboot. It doesn't seem to be as simple as tweaking /etc/fstab, like > it > > is on bare drives. I suppose I can do an assemble operation manually > each > > time. Is there a best practice for making this automatic? > > If you install a system using the debian-installer then it will set > everything up for you automatically. For people installing a pristine > system with raid it is all automatic and nothing more needs to be > done. For people adding additional mdadm raid volumes later they need > to do some configuration for it. >
This is exactly my case. I'm installing a RAID-0 for gigantic transient files. I do not anticipate using RAID for the system, partly because all bays are full. Mdadm has two different times when it will assemble raid volumes. In > reverse time order the second is at boot time by looking at > /etc/mdadm/mdadm.conf file and assembling all raids configured there. > That data can be created using mdadm --scan to search for physical > devices and to produce the config files. Take that information and > edit it as needed. > > Question: what is it that does this assembly at boot time? Is there a daemon that's running now that I've installed mdadm? > Typically, note the append >> operator: > > mdadm --detail --scan >>/dev/mdadm/mdadm.conf > ...edit /dev/mdadm/mdadm.conf...clean up and remove duplicate lines... > > The debian-installer formats the lines slightly differently than mdadm > output does. I don't know if the differences are really significant. > I usually edit to follow the original debian-installer format. > > I might do the same, but you give no hint what that looks like, and I am not installing a new system to find out. > The important part is that the arrays are listed with the device and > with the UUID of the array. That will instruct mdadm to assemble > those arrays when mdadm is started at system boot time. > Hoping format is not too crucial.... > [ ... snippage -- stuff about initramfs ] Bob > -- Kevin O'Gorman #define QUESTION ((bb) || (!bb)) /* Shakespeare */ Please consider the environment before printing this email.
