Media_Wearout_Indicator going up?

[AKvis]

I have been monitoring Media Wearout Indicator for a while, but I saw something odd in our Munin graphs, so I dumped the output of smartctl every minute and here are the result:

...

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

[120 lines with value:092 removed]

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 092 092 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

233 Media_Wearout_Indicator 0x0032 091 091 000 Old_age Always - 0

...

I tought the Media_Wearout_Indicator were going down from 100 as the drive were wearing out and that I could expect failure when it hits 0 - how is it going up again?! The value have been on 091 all the time since I've started monitoring it, but like the above, the value is 092 for a couple of hours before going down to 091 again...

=== START OF INFORMATION SECTION ===

Device Model: INTEL SSDSA2M120G2GC

Serial Number: ******************

Firmware Version: 2CV102HD

User Capacity: 120,034,123,776 bytes

Device is: Not in smartctl database [for details use: -P showall]

ATA Version is: 7

ATA Standard is: ATA/ATAPI-7 T13 1532D revision 1

Local Time is: Tue Jul 2 14:39:14 2013 CEST

SMART support is: Available - device has SMART capability.

SMART support is: Enabled

/Anders

[Jose_H_Intel1]

At this time there are no plans to release software for other operating systems.

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