hdparm standby timeout stopped working

Hello,

I had sucessfully set the standby timeout on recent Hitachi SATA drives
(actually 3 of them in a PMP enclosure, using hdparm -S 5 /dev/sd?). The
drive were entering standby mode confirmed by hdparm -C.

Suddenly all the drives stopped entering automatically standby mode,
even when not mounted, although forcing standby with hdparm -y is still
working...

I tried to boot in single mode (s) to be sure fewer services are
running. Same thing.

I cannot see what I changed on the system. Day - 1 is was working fine...

Thanks

Kernel is 2.6.32-71.14.1.el6.i686

[root@homecine ~]# hdparm -I /dev/sdb

/dev/sdb:

ATA device, with non-removable media
Model Number: Hitachi HDS723030ALA640
Serial Number: MK0311YHG3X51A
Firmware Revision: MKAOA3B0
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II
Extensions, SATA Rev 2.5, SATA Rev 2.6; Revision: ATA8-AST T13 Project
D1697 Revision 0b
Standards:
Used: unknown (minor revision code 0x0029)
Supported: 8 7 6 5
Likely used: 8
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 5860533168
Logical Sector size: 512 bytes
Physical Sector size: 512 bytes
device size with M = 1024*1024: 2861588 MBytes
device size with M = 1000*1000: 3000592 MBytes (3000 GB)
cache/buffer size = unknown
Form Factor: 3.5 inch
Nominal Media Rotation Rate: 7200
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific
minimum
R/W multiple sector transfer: Max = 16 Current = 0
Advanced power management level: disabled
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* SMART feature set
Security Mode feature set
* Power Management feature set
* Write cache
* Look-ahead
* Host Protected Area feature set
* WRITE_BUFFER command
* READ_BUFFER command
* NOP cmd
* DOWNLOAD_MICROCODE
Advanced Power Management feature set
Power-Up In Standby feature set
* SET_FEATURES required to spinup after power up
SET_MAX security extension
* 48-bit Address feature set
* Device Configuration Overlay feature set
* Mandatory FLUSH_CACHE
* FLUSH_CACHE_EXT
* SMART error logging
* SMART self-test
Media Card Pass-Through
* General Purpose Logging feature set
* WRITE_{DMA|MULTIPLE}_FUA_EXT
* 64-bit World wide name
* URG for READ_STREAM[_DMA]_EXT
* URG for WRITE_STREAM[_DMA]_EXT
* WRITE_UNCORRECTABLE_EXT command
* {READ,WRITE}_DMA_EXT_GPL commands
* Segmented DOWNLOAD_MICROCODE
unknown 119[7]
* Gen1 signaling speed (1.5Gb/s)
* Gen2 signaling speed (3.0Gb/s)
* unknown 76[3]
* Native Command Queueing (NCQ)
* Host-initiated interface power management
* Phy event counters
* NCQ priority information
Non-Zero buffer offsets in DMA Setup FIS
* DMA Setup Auto-Activate optimization
Device-initiated interface power management
In-order data delivery
* Software settings preservation
* SMART Command Transport (SCT) feature set
* SCT LBA Segment Access (AC2)
* SCT Error Recovery Control (AC3)
* SCT Features Control (AC4)
* SCT Data Tables (AC5)
Security:
Master password revision code = 65534
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
128min for SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 5000cca225c1c6d5
NAA : 5
IEEE OUI : 000cca
Unique ID : 225c1c6d5
Checksum: correct

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