Richard Elling wrote:
> I was able to reproduce this in b93, but might have a different
> interpretation of the conditions.  More below...
>
> Ross Smith wrote:
>   
>> A little more information today.  I had a feeling that ZFS would
>> continue quite some time before giving an error, and today I've shown
>> that you can carry on working with the filesystem for at least half an
>> hour with the disk removed.
>>
>> I suspect on a system with little load you could carry on working for
>> several hours without any indication that there is a problem.  It
>> looks to me like ZFS is caching reads & writes, and that provided
>> requests can be fulfilled from the cache, it doesn't care whether the
>> disk is present or not.
>>     
>
> In my USB-flash-disk-sudden-removal-while-writing-big-file-test,
> 1. I/O to the missing device stopped (as I expected)
> 2. FMA kicked in, as expected.
> 3. /var/adm/messages recorded "Command failed to complete... device gone."
> 4. After exactly 9 minutes, 17,951 e-reports had been processed and the
> diagnosis was complete.  FMA logged the following to /var/adm/messages
>   
Wow! Who knew that 17, 951 was the magic number...  Seriously, this does 
seem like an "excessive amount of certainty".


--
paul
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