On Thu, Dec 16, 2010 at 12:44 PM, Bob Proulx <b...@proulx.com> wrote: > Tom H wrote: >> Bob Proulx wrote: >>> >>> I have not previously ever changed a hostname in /etc/mdadm/mdadm.conf >>> and not had a problem renaming systems. My mdadm.conf files don't >>> contain the actual hostname. >> >> Look up the HOSTNAME directive in the mdadm.conf man page. >> >> The default is "HOSTNAME <system>". > > Do you mean "HOMEHOST" instead of "HOSTNAME"? > > Regardless I have never changed it. My hostname is not "<system>". > My mdadm.conf does not contain the actual hostname. And use of > "<system>" is documented to automatically use the value from > gethostname(2). > > In any case I have renamed systems many times and never had it fail > because of changing the hostname nor have I ever seen the > /dev/mdX_Y naming referred to in the documentation on any system that > I have renamed. I wasn't even aware of the possibility until this > discussion thread. When querying mdadm for details it is not > reporting any arrays tagged with a homehost. I am using mdadm > versions v2.6.7.2 in Lenny and v3.1.4 in Squeeze. > > I would guess that internally uuid naming has been doing the actual > task of associating arrays. The documentation says: > > A new array will normally get a randomly assigned 128bit UUID > which is very likely to be unique. ... Also, using --uuid= > when creating a v0.90 array will silently override any > --homehost= setting.
Yes, HOMEHOST, sorry. Using "--uuid" overrides "--homehost" for metadata v0.90 since for that version the hostname is used to create part of the uuid. "<system>" means "use the hostname of the current box". Both "mdadm --detail /dev/mdX" and "mdadm --examine /dev/sdXY" will output "(local to host <hostname>)" on the uuid line for metadata v0.90 and on the name line for metadata v1.x. When you refer to "/dev/mdX_Y", do you mean partitionable arrays (/dev/md/dX", "/dev/md/dXpY")? -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/aanlktimwnwbv_yokc-fvnxb5+by50o+9b592q+xdk...@mail.gmail.com
