[Bug 1436020] Re: Multipath: underlying disks are listed on systems w/ 24+ disks

[Mauricio Faria de Oliveira]

Notice the one/two spaces case:
	~ # multipath -l
	...
	mpath3 (36005076307ffc7b0000000000000071f) dm-3 IBM,2107900
	size=15G features='1 queue_if_no_path' hwhandler='0' wp=rw
	`-+- policy='round-robin 0' prio=-1 status=active
	  |- 1:0:0:3 sdd  8:48   active undef running
	  |- 1:0:1:3 sdi  8:128  active undef running
	  |- 1:0:2:3 sdn  8:208  active undef running
	  |- 1:0:3:3 sds  65:32  active undef running
	  |- 1:0:4:3 sdx  65:112 active undef running
	  `- 1:0:5:3 sdac 65:192 active undef running


Before:

	~ # multipath -l | grep -o '\([#0-9]\+:\)\{3\}[#0-9]\+ [hs]d[a-z]\+ [0-9]\+:[0-9]\+'
	1:0:5:2 sdab 65:176
	1:0:5:1 sdaa 65:160
	1:0:5:4 sdad 65:208
	1:0:5:3 sdac 65:192

After:

	~ # multipath -l | grep -o '\([#0-9]\+:\)\{3\}[#0-9]\+ [hs]d[a-z]\+ \+[0-9]\+:[0-9]\+'
	1:0:0:2 sdc  8:32
	1:0:1:2 sdh  8:112
	1:0:2:2 sdm  8:192
	1:0:3:2 sdr  65:16
	1:0:4:2 sdw  65:96
	1:0:5:2 sdab 65:176
	1:0:0:1 sdb  8:16
	1:0:1:1 sdg  8:96
	1:0:2:1 sdl  8:176
	1:0:3:1 sdq  65:0
	1:0:4:1 sdv  65:80
	1:0:5:1 sdaa 65:160
	1:0:0:0 sda  8:0
	1:0:1:0 sdf  8:80
	1:0:2:0 sdk  8:160
	1:0:3:0 sdp  8:240
	1:0:4:0 sdu  65:64
	1:0:5:0 sdz  65:144
	1:0:0:4 sde  8:64
	1:0:1:4 sdj  8:144
	1:0:2:4 sdo  8:224
	1:0:3:4 sdt  65:48
	1:0:4:4 sdy  65:128
	1:0:5:4 sdad 65:208
	1:0:0:3 sdd  8:48
	1:0:1:3 sdi  8:128
	1:0:2:3 sdn  8:208
	1:0:3:3 sds  65:32
	1:0:4:3 sdx  65:112
	1:0:5:3 sdac 65:192

Currently only the space(s) between disk and major:minor are varying; but let's
make the space(s) between SCSI address and disk also variable, just in case.

	~ # multipath -l | grep -o '\([#0-9]\+:\)\{3\}[#0-9]\+ \+[hs]d[a-z]\+ \+[0-9]\+:[0-9]\+'
	<<same output>>

** Summary changed:

- Multipath: underlying disks are listed on systems w/ 24+ disks
+ Multipath: underlying disks are listed for partitioning on systems w/ 24+ disks

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https://bugs.launchpad.net/bugs/1436020

Title:
  Multipath: underlying disks are listed for partitioning on systems w/
  24+ disks

Status in partman-base package in Ubuntu:
  New

Bug description:
  On top of the fix in LP: #1430074, there's a minor bit missing.

  It doesn't hide all underlying disks in the partitioning dialog if
  there's 24+ underlying disks (i.e., enough for sdaa and so on to show
  up).

  It happens because, in that case, 'multipath -l' now puts 2 spaces
  betweek disk and major:minor for the sd[a-z] disks, and only 1 space
  for sd[a-z][a-z].

  Patch attached.

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