Re: is "replaceable" in 3.2 considered stable

[Brad Campbell <lists2009@fnarfbargle.com>]

On 07/11/12 17:55, joystick wrote:

>
> we still need someone to test the other case, a more common scenario I'd
> say: the disk to be replaced fails during hot-replace

I suspect I can do that by creating some "media errors" using hdparm 
while the replacement is in progress.

I'd have *thought* that the procedure should be to re-direct the read to 
another mirror (it is a raid-10 after all).

>> The test machine is on UPS, so I have not done any testing that
>> involves reboots during a re-sync.
>
> And also this one...
> Best simulation would be unpulling the plug so that disks do not flush
> if you have still time for us, of course :-)

I assume to test that adequately (as in re-assemble an array with a 
replacement in progress) I'd need to upgrade mdadm to the latest git code?

No biggie, just requires a bit more tweaking the initramfs stuff.

The tests thus far have been conducted in spare drive slots in my 
production server. This afternoon I picked up a new motherboard for my 
test box so tomorrow I'll have a dedicated machine to play with.

Debian on SSD, and 10 x 1TB 7200 RPM drives that have been retired from 
active hard service (they have about 22,000 hours on them) and ready as 
a test mule.

If you put together a set of tests you'd like performed I'll be happy to 
run them and see what happens. The machine is on a managed APC PDU (yay 
Gumtree!), so remote power cycling is a lot easier than it used to be 
and I really don't mind hammering the disks with emergency parks or 
excessive cycles.