On Sun, 13 Sep 2015 12:58:25 -0500 "David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx> wrote: > After looking at the output of /proc/mdstat many times, there is one 'human > factors' (human nature) bit of difficulty with the order of the output > (especially with a standard 2-disk raid1 array and 1.2 superblock: > > md1 : active raid1 sda7[2] sdb7[1] > 52396032 blocks super 1.2 [2/2] [UU] > ^^^^^^^^^ > > When scanning the information quickly to insure you do NOT have 1/2 disks > active in the array, you run into the version and disk information side-by-side. > > "1.2 [2/2]" > > Which naturally causes a short "huh?..., OK" double-take. For me it does not. 1.2 is clearly different from 1/2, and the actual 2/2 that you have is even enclosed in brackets to stand out more prominently. > Is there any way from a user standpoint (short of "read a b c d e f"; echo > "$c $d $a $b $e $f"), to rearrange the order the information is reported as: > > md1 : active raid1 sda7[2] sdb7[1] > super 1.2 52396032 blocks [2/2] [UU] > > That simple change makes glancing down the right-side of the information much > easier on the brain.... If you want to simplify the mental processing, just look for any "_"s in the string of "U"s which is also conveniently placed at the end of the line. In a partially down RAID1 you'd have [U_] or [_U] there, which is very noticeable compared to the usual [UU]. > I don't think this was ever a concern prior to the 1.2 superbock and I'm not > sure it warrants any brainpower now. However, it was something that stood out to > me, so I thought I would pass it along. I don't think it's justified to randomly change things around which many shell scripts and the like are quite likely to depend on, just out of a personal preference. -- With respect, Roman
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