Kevin Keane wrote:
>> -----Original Message-----
>> From: John Drescher [mailto:drescherjm AT gmail DOT com]
>> Sent: Friday, November 13, 2009 5:06 AM
>> To: Bruno Friedmann; bacula-users
>> Subject: Re: [Bacula-users] eSATA / USB disks as media for Bacula
>>
>>> Just an add to the previous great comments.
>>>
>>> If you envisage to use e-sata, check that your chipset/bios support
>> hot-replace/add.
>>> It's working nicely with laptop, but not always for a vaste majority
>> of "cheap" motherboard.
>>> Mine a Asus M2N-Pro support e-sata : but only on cold restart
>> (jmicron and 2.6.27 kernel)
>>> Sadly I've to use the usb-2 ...
>> I am pretty sure the regular SATA ports on this board (nvidia chipset
>> ones) support hot swap. I say that because I have 3 or 4 of my linux
>> raid servers at work using M2Ns and I have definitely hot swapped
>> drives on them.
> 
> I am by no means an eSATA expert, but my understanding is that the real issue 
> is IDE emulation and (Windows) driver support.
> 
> Based on that understanding - which could be wrong:
> 
> IDE mode = no hot swapping
> AHCI mode = hot swapping
> 
> At least assuming that AHCI is implemented according to proper specs - which 
> may or may not be true for cheap motherboards.
> 
> AHCI needs to be enabled in the BIOS, and ALSO needs to be supported by the 
> hard disk driver in your operating system. Windows 7 and I believe also Vista 
> have AHCI-capable drivers, but Windows XP doesn't out of the box.
> 
> In the Linux world, I really don't know - I believe that it would be slightly 
> ahead of the curve and probably have a bit better AHCI support.
> 
> Unfortunately "I have hot-swapped drives" is not a reliable measure. It is 
> entirely possible that hotswapping worked purely by chance but would break 
> the next time you try it.
> 
> 
For information mine is a
Board Info: #2

    Manufacturer: "ASUSTeK Computer INC."

    Product: "M2N-SLI DELUXE"

    Version: "1.XX"


which have 6 nv_sata ahci inside
"nVidia MCP55 SATA Controller"
( 2x320Gb WDC system & data in raid 1 + 4 1TB samsung Raid-edition in raid 10 
for bacula storage )

otherwise the external e-sata is mapped with a jmicron controller ( which 
doesn't really work actually with the 2.6.27 kernel )
perhaps it would work more nicely with the new 2.6.31 ...

for info
33: PCI 200.0: 0106 SATA controller (AHCI 1.0)
  [Created at pci.318]
  UDI: /org/freedesktop/Hal/devices/pci_197b_2363
  Unique ID: B35A.9XBu8y_VUsD
  Parent ID: vuMS.D2XgYo_AJe1
  SysFS ID: /devices/pci0000:00/0000:00:0e.0/0000:02:00.0
  SysFS BusID: 0000:02:00.0
  Hardware Class: storage
  Model: "ASUSTeK P5B [JMB363]"
  Vendor: pci 0x197b "JMicron Technologies, Inc."
  Device: pci 0x2363 "JMicron 20360/20363 AHCI Controller"
  SubVendor: pci 0x1043 "ASUSTeK Computer Inc."
  SubDevice: pci 0x81e4 "P5B [JMB363]"
  Revision: 0x03
  Driver: "ahci"
  Driver Modules: "ahci"
  Memory Range: 0xfddfe000-0xfddfffff (rw,non-prefetchable)
  Memory Range: 0xfdde0000-0xfddeffff (ro,prefetchable,disabled)
  IRQ: 16 (19116813 events)
  Module Alias: "pci:v0000197Bd00002363sv00001043sd000081E4bc01sc06i01"
  Driver Info #0:
    Driver Status: ahci is active
    Driver Activation Cmd: "modprobe ahci"
  Config Status: cfg=no, avail=yes, need=no, active=unknown
  Attached to: #25 (PCI bridge)




-- 

     Bruno Friedmann

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