This article describes how to check if the Hard drive for NetScaler SDX is healthy or corrupted.
1. smartctl -a /dev/sdb > before-sdb.txt
2. smartctl -t short /dev/sdb
3. wait couple of minutes for above test to complete
4. smartctl -a /dev/sdb > after-sdb.txt
5. smartctl -a /dev/sda > before-sda.txt
6. smartctl -t short /dev/sda
7. wait couple of minutes for above test to complete
8. smartctl -a /dev/sda > after-sda.txt