There's some issue around cloudelastic1002 /dev/sdb device according to icinga: https://icinga.wikimedia.org/cgi-bin/icinga/extinfo.cgi?type=2&host=cloudelastic1002&service=Device+not+healthy+-SMART-
onimisionipe@cloudelastic1002:~$ sudo smartctl -H /dev/sdb smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.9.0-9-amd64] (local build) Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: FAILED! Drive failure expected in less than 24 hours. SAVE ALL DATA. Failed Attributes: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 201 Power_Loss_Cap_Test 0x0033 001 001 010 Pre-fail Always FAILING_NOW 4 (82 6532)