hot plugging eSATA
D. Hugh Redelmeier
hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org
Sat Apr 3 16:14:33 UTC 2010
| From: Lennart Sorensen <lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org>
| Date: Tue, 11 Aug 2009 10:04:45 -0400
| Subject: Re: [TLUG]: How do you expand a RAID5 Array?
| AHCI controllers should support hot plug, although I have seen one case
| where a hotplug caused another drive on the controller to momentarily
| disappear, which didn't please the raid at all. I suppose having hot
| swap cages makes it more reliable.
Thanks for this clue.
I tried hotp lugging eSATA on my machine (HP Pavilion a6245n desktop
with Intel G33 and ICH9R chipset). It didn't seem to work.
I went to the BIOS and found
Advanced: SATA1 controller mode [IDE]
SATA2 Controller [Enabled]
I switched to
Advanced: SATA1 controller mode [AHCI]
and the SATA2 line disappeard?!?
I rebooted and hot plugging worked. At least kind of.
Lessons:
- all SATA controllers support hot plug
- generally only in AHCI mode
- some (lots?) of BIOSes have setting that sets the mode
- the default setting may be IDE or ATA preventing hot plug
- the reason might be that some versions of Windows don't come whith
AHCI drivers.
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