[Bug 14442] resume after hibernate: /dev/sdb drops and returns as /dev/sde

[bugzilla-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=14442


Oleksandr Yermolenko <yaa.bta@gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |yaa.bta@gmail.com




--- Comment #27 from Oleksandr Yermolenko <yaa.bta@gmail.com>  2010-02-23 14:15:02 ---
I have similar problem with reappearing of HDD with different /dev/sdX name
after hibernate.
Interesting details:
1) NVIDIA graphics card running with proprietary drivers (190.53) instead of
Radeon.
2) only one of 3 HDDs reappears with different name
3) system logs have "n_sectors mismatch" message.
4) experienced this problem on kernels 2.6.31.12 and 2.6.32.7 on Debian squeeze
amd64. Kernels are from kernel.org, not from repositories.
5) This drive is Seagate ST3500320AS with SD1A firmware, sometimes it changes
name from /dev/sdb to /dev/sdd after resume  The frequency of the event is
relatively low (about one event for 5-10 hibernate/resume cycles). Other HDDs
(SAMSUNG HD321KJ (/dev/sda) and WDC WD15EARS-00Z5B1 (/dev/sdc)) never change
their /dev/sdX names after resume.

>From /var/log/messages:
...
sd 2:0:0:0: [sda] Starting disk
sd 3:0:0:0: [sdb] Starting disk
ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata4.00: n_sectors mismatch 976773168 != 976771055
ata4.00: disabled
sd 3:0:0:0: [sdb] START_STOP FAILED
sd 3:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
sd 5:0:0:0: [sdc] Starting disk
usb 4-1: reset low speed USB device using uhci_hcd and address 2
ata4: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata4.00: HPA detected: current 976771055, native 976773168
ata4.00: ATA-8: ST3500320AS, SD1A, max UDMA/133
ata4.00: 976771055 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata4.00: configured for UDMA/133
ata4.00: detaching (SCSI 3:0:0:0)
usb 4-2: reset low speed USB device using uhci_hcd and address 3
usb 5-1: reset low speed USB device using uhci_hcd and address 2
Restarting tasks ... done.
sd 3:0:0:0: [sdb] Synchronizing SCSI cache
sd 3:0:0:0: [sdb] Stopping disk
scsi 3:0:0:0: Direct-Access     ATA      ST3500320AS      SD1A PQ: 0 ANSI: 5
sd 3:0:0:0: Attached scsi generic sg1 type 0
sd 3:0:0:0: [sdd] 976771055 512-byte logical blocks: (500 GB/465 GiB)
sd 3:0:0:0: [sdd] Write Protect is off
sd 3:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support
DPO or FUA
 sdd: sdd1 sdd2 < sdd5 sdd6 >
sd 3:0:0:0: [sdd] Attached SCSI disk
...

Note that numbers in "n_sectors mismatch" message:
  ata4.00: n_sectors mismatch 976773168 != 976771055
are the same as in message "HPA detected" message:
  ata4.00: HPA detected: current 976771055, native 976773168

What does it mean? Is this something interesting?

Thanks.

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