Re: 3x check of "Caching mode page"

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On Fri, 14 Feb 2014, Toralf Förster wrote:

> I'm just wondering why it happens 3 times in a row :
> 
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: new high-speed USB device number 7 using ehci-pci
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: New USB device found, idVendor=04b4, idProduct=6830
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: New USB device strings: Mfr=56, Product=72, SerialNumber=91
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: Product: Lacie Mobile Drive
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: Manufacturer: Lacie Group. SA
> Feb 14 16:12:53 n22 kernel: usb 1-1.2: SerialNumber: DEF10D5E95F5
> Feb 14 16:12:53 n22 kernel: usb-storage 1-1.2:1.0: USB Mass Storage device detected
> Feb 14 16:12:53 n22 kernel: scsi9 : usb-storage 1-1.2:1.0
> Feb 14 16:12:54 n22 kernel: scsi 9:0:0:0: Direct-Access     SAMSUNG  HM160JC          0000 PQ: 0 ANSI: 0
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: Attached scsi generic sg3 type 0
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] 312581808 512-byte logical blocks: (160 GB/149 GiB)
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Write Protect is off
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Mode Sense: 27 00 00 00
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] No Caching mode page found
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Assuming drive cache: write through
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] No Caching mode page found
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Assuming drive cache: write through
> Feb 14 16:12:54 n22 kernel: sdc: sdc1
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] No Caching mode page found
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Assuming drive cache: write through
> Feb 14 16:12:54 n22 kernel: sd 9:0:0:0: [sdc] Attached SCSI disk

You need to ask on the linux-scsi mailing list.  Those messages are 
produced by the sd (SCSI disk) driver.

Alan Stern

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