maturity of hotplug disk storage devices

[Hotplug List Emails <sfhotplug@feldmark.com>]

Hi,

I am looking for some advice on the maturity of hotplug functions for 
Linux disk storage devices.  I looked into this two years ago and found 
that although insertion/removal appeared to often work, in particular 
with scsi, it was not really officially supported thru the entire 
protocol stack at the time.

Now, I find evidence in general, hotplug support has improved, 
presumeably positively influenced by subsequent USB and firewire 
development.  But disks are more complex than printers, scanners, etc so 
Im having a difficult time forming an opinion about how "official" this 
all is for disk storage.   Have the improvements gotten into disk 
storage related areas also?  Should I really consider relying on hotplug 
disk storage in a mission critical application?

Well, I would really be interested in any comments anyone had, privately 
or publicly, on the maturity of hotplug disk storage in Linux 2.4.  Does 
insertion/removal of existing/new devices work reliably on IDE, SCSI, 
Fibrechannel, USB, iee1394?  Is it "officially" supported?  Are you 
using it on a mission critical machine?  Do things like the MD driver 
and LVM handle hotplugged drives reliably well?

Of course I assume appropriate hardware doing the right things 
electrically and that any filesystem is unmounted.

Any help understanding the current state would be greatly appreciated!

Thanks,
Mark
sfhotplug@feldmark.com

P.S. Ive looked thru the LDP, google, and elsewhere with little luck; 
apologies that I can't look at the home page for the hotplug project 
because I am in China, and all sourceforge project home pages are 
blocked.  sigh.....




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