Messages in this thread |  | | | Subject | Re: Serial ATA (SATA) for Linux status report | | From | Andre Tomt <> | | Date | Thu, 04 Dec 2003 02:02:50 +0100 |
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On Thu, 2003-12-04 at 00:36, Jeff Garzik wrote: > Andre Tomt wrote: > > One question - with "including hotplug", does that mean some set hotplug > > standard? Reason I'm asking is, we have a few servers from SuperMicro, > > with a ICH5R S-ATA controller that claims it's supporting hotplug, but > > hotplug is not in your ICH5-summary. > > Alas, there is no hotplug support in the ICH5 or ICH5-R SATA hardware. > > One could argue there is "coldplug" support in that hardware -- disable > the entire interface, including any active devices, then re-enable and > re-scan -- but it's a bit of a hack. If there's enough demand, I could > write some code for that. It would involve something like > > # /sbin/sata off > { plug in or remove a device } > # /sbin/sata on > > You really, really, really don't want to actually unplug a SATA drive > while it's active, on ICH5 hardware.
Hmm. There is a backplane involved, that might change things a little.
Quoting the manual: "A Serial ATA controller is incorporated into the 875P chipset to provide a two-port Serial ATA subsystem, which is RAID 0 and RAID 1 supported. The Serial ATA drives are hot-swappable units. Note: The operating system you use must have RAID support to enable the hot-swap capability and RAID function of the Serial ATA drives."
"The Serial ATA drives plug into a backplane that provides power, drive ID and bus termination. A RAID controller can be used with the backplane to provide data security. The operating system you use must have RAID support to enable the hot-swap capability of the Serial ATA drives."
The wording here is a little confusing, but hot-swap seems to work quite well with intels windows fakeraid-drivers, at least. One just pushes the "i'm going to pull you out now"-button on the tray, and pull the drive tray out. Maybe it triggers an event to the fakeraid-driver, wich then powers down the bus? black backplane-magic?
Anyways, REAL S-ATA hardware RAID controllers are pretty cheap over here nowadays..
[trimmed off linux-scsi]
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