Fedora MD RAID check WTF

Today, out of the blue my box decided to do the RAID check on my MD devices. I can’t remember seeing it before while I was running Gentoo, but now with Fedora things feel somewhat different. Fedora does automate quite a few things out of the box – the things I have omitted in my previous Gentoo experience.

What have caught my attention was both high load on machine (out of the blue) and:

# cat /proc/mdstat
 Personalities : [raid1] [raid0]
 md126 : active raid1 sdc6[1] sda6[0]
 308793280 blocks [2/2] [UU]
 [========>............] check = 40.7% (125758464/308793280) finish=43.7min speed=69702K/sec

which lead me to a nearby Google outlet where I immediately borrowed some wisdom on a somewhat related subject: disks and S.M.A.R.T.:

# smartctl --health /dev/sdc
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-2.6.38.8-32.fc15.x86_64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
Please note the following marginal Attributes:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
190 Airflow_Temperature_Cel 0x0022   053   040   045    Old_age   Always   In_the_past 47 (2 51 47 25)

so after enjoying rather interesting feature (smartctl that is) I have also checked around and found out that in some configurations it’s an “automatic behavior”. Which lead me to further discoveries this time from Ubuntu-land and ended up in glorious discovery of “magic device” in my posession:

# cat /etc/cron.d/raid-check
# Run system wide raid-check once a week on Sunday at 1am by default
0 1 * * Sun root /usr/sbin/raid-check

…back to sorting out the rest of my Gentoo -> Fedora migration…

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