On Sun, 2015-01-11 at 18:18 +0100, Arne Nordmark wrote: > With the latest Wheezy kernel I am seeing a new device /dev/sda that has > not been seen in previous kernels. Below is some info that may be of > interest. > > ls -l /dev/disk/by-path/ > totalt 0 > lrwxrwxrwx 1 root root 9 jan 11 17:24 pci-0000:03:00.0-scsi-1:0:0:0 -> > ../../sda > > lspci > 03:00.0 IDE interface: Marvell Technology Group Ltd. 88SE6121 SATA II / > PATA Controller (rev b2) > > > ls -l /dev/disk/by-id > totalt 0 > lrwxrwxrwx 1 root root 9 jan 11 17:24 > ata-Config_Disk_0_CP-5723_Port_0_1_0_J -> ../../sda > lrwxrwxrwx 1 root root 9 jan 11 17:24 > scsi-SATA_Config_Disk_0CP-5723_Port_0_1_0_J -> ../../sda > > grep -E 'Config|sda' /var/log/kern.log > Jan 11 17:24:32 ano4 kernel: [ 1.236338] ata2.00: ATA-7: Config > Disk 0, 1.2569, max MWDMA2 > Jan 11 17:24:32 ano4 kernel: [ 1.244446] scsi 1:0:0:0: Direct-Access > ATA Config Disk 0 1.25 PQ: 0 ANSI: 5 > Jan 11 17:24:32 ano4 kernel: [ 2.848798] sd 1:0:0:0: [sda] 16777215 > 512-byte logical blocks: (8.58 GB/7.99 GiB) > Jan 11 17:24:32 ano4 kernel: [ 2.848847] sd 1:0:0:0: [sda] Write > Protect is off > Jan 11 17:24:32 ano4 kernel: [ 2.848849] sd 1:0:0:0: [sda] Mode > Sense: 00 3a 00 00 > Jan 11 17:24:32 ano4 kernel: [ 2.848870] sd 1:0:0:0: [sda] Write > cache: disabled, read cache: enabled, doesn't support DPO or FUA > Jan 11 17:24:32 ano4 kernel: [ 2.850470] sda: unknown partition table > Jan 11 17:24:32 ano4 kernel: [ 2.850631] sd 1:0:0:0: [sda] Attached > SCSI disk > > Could it be something with RAID on the motherboard? Should it be > reported as a bug?
I think this disk is simulated by the RAID controller. There's a comment in the Linux AHCI driver: * When there's no device attached to the first downstream port of the * 4726, "Config Disk" appears, which is a pseudo ATA device to * configure the 4726. However, this has been present since 2.6.24 so I don't know why you would see any change in behaviour now. Ben. -- Ben Hutchings One of the nice things about standards is that there are so many of them.
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