UloPe's questions

The question is mostly in the title already.

mdadm and /proc/mdstat insist on listing md members by their "traditional" /dev/sdX names. What I want is for them to use the newer udev device names (e.g. /dev/disk/by-path and by-id).

I already changed /etc/mdadm/mdadm.conf from

DEVICE partitions

to

DEVICE /dev/disk/by-path/*

But this seems to have no effect at all.

Also the arrays were cerated using the by-path device names.

This is on Ubuntu 11.10.

Current /proc/mdstat:

~# cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md1 : active raid5 sdi[4] sde[2] sdh[1] sdd[0]
      2929651200 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
      [=>...................]  recovery =  7.0% (69242720/976550400) finish=632.8min speed=23893K/sec

md0 : active raid5 sdb[0] sdg[4] sdc[2] sdf[1]
      2197228032 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
      [===>.................]  recovery = 19.8% (145510552/732409344) finish=242.7min speed=40288K/sec

unused devices: <none>

ls -l /dev/disk/by-path:

~# ll /dev/disk/by-path/
total 0
lrwxrwxrwx 1 root root  9 2012-04-11 01:15 pci-0000:00:1f.1-scsi-0:0:0:0 -> ../../sr0
lrwxrwxrwx 1 root root  9 2012-04-11 01:15 pci-0000:00:1f.2-scsi-1:0:0:0 -> ../../sda
lrwxrwxrwx 1 root root 10 2012-04-11 01:15 pci-0000:00:1f.2-scsi-1:0:0:0-part1 -> ../../sda1
lrwxrwxrwx 1 root root 10 2012-04-11 01:15 pci-0000:00:1f.2-scsi-1:0:0:0-part2 -> ../../sda2
lrwxrwxrwx 1 root root  9 2012-04-11 01:19 pci-0000:0e:00.0-scsi-0:0:0:0 -> ../../sdb
lrwxrwxrwx 1 root root  9 2012-04-11 01:19 pci-0000:0e:00.0-scsi-0:0:1:0 -> ../../sdc
lrwxrwxrwx 1 root root  9 2012-04-11 01:15 pci-0000:0e:00.0-scsi-0:0:2:0 -> ../../sdd
lrwxrwxrwx 1 root root  9 2012-04-11 01:26 pci-0000:0e:00.0-scsi-0:0:3:0 -> ../../sde
lrwxrwxrwx 1 root root  9 2012-04-11 01:15 pci-0000:0e:00.0-scsi-0:0:4:0 -> ../../sdf
lrwxrwxrwx 1 root root  9 2012-04-11 01:15 pci-0000:0e:00.0-scsi-0:0:5:0 -> ../../sdg
lrwxrwxrwx 1 root root  9 2012-04-11 01:26 pci-0000:0e:00.0-scsi-0:0:6:0 -> ../../sdh
lrwxrwxrwx 1 root root  9 2012-04-11 01:26 pci-0000:0e:00.0-scsi-0:0:7:0 -> ../../sdi

assume I have a domain with the following RRs:

domain.com.    IN A       1.2.3.4
domain.com.    IN MX      mail.domain.com.         10
*              IN MX      othermail.domain.com.    10
*              IN CNAME   domain.com.
mail           IN A       1.2.3.4

I hoped this would allow me to server web pages and receive mail on any subdomain of domain.com but when I test it:

~# dig blah.domain.com MX

; <<>> DiG 9.4.3-P1 <<>> blah.domain.com MX
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12815
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 2, ADDITIONAL: 2

<..snip..>

;; ANSWER SECTION:
blah.domain.com.    84770   IN  CNAME   domain.com.
domain.com.     83445   IN  MX  10 mail.domain.com.

I would expect to get an answer section like so:

;; ANSWER SECTION:
blah.domain.com.    84770   IN  MX  10 othermail.domain.com.

But it seems that I get the CNAME wildcard record instead of the MX.

From reading various things I found online it seems to me that this behaviour is by design (however braindead it may be).

Now my question is if it is possible in any way to have a configuration like this returning different anserws based on the record type?

Thanks.