HAST with broken HDD

[InterNetX - Juergen Gotteswinter]

Am 05.10.2014 um 17:50 schrieb InterNetX - Juergen Gotteswinter:
> 
> 
> Am 05.10.2014 um 16:50 schrieb Dmitry Morozovsky:
>> On Fri, 3 Oct 2014, Mikolaj Golub wrote:
>>
>>> Disk errors are recorded to syslog. Also error counters are displayed
>>> in `hastctl list' output. There is snmp_hast(3) in base -- a module
>>> for bsnmp to retrieve this statistics via snmp protocol (traps are not
>>> supported though).
>>>
>>> For notifications, the hastd can be configured to execute an arbitrary
>>> command on various HAST events (see description for `exec' in
>>> hast.conf(5)). Unfortunately, it does not have hooks for I/O error
>>> events currently. It might be worth adding though. The problem with
>>> this that it may generate to many events, so some throttling is
>>> needed.
>>
>> And, I it, this should be noted, some kind of error-coalescing or similar 
>> before going from "warning" shate (there are some read error, but otherwise the 
>> disk is useable, and it would be overly hassle to switch to remote component 
>> completely) to "error" state (component is unuseable and needs to be replaced 
>> ASAP; drop it from HAST pair, and switchover if needed). 
>>
>> Error such as "device lost" is, of course, fatal from the very beginning; but 
>> -- how should we interpret, well, sporadic controller resets with the disk 
>> coming back and catching syncing again?
>>
>>
> 
> Hi Dmitry,
> 
> since HAST is somehow not so different from DRBD, why dont take their
> way of Error Handling as "Template". DRBD works pretty well and rock
> solid since years, a well established Solution. HAST got the potencial
> to become this also, with some improvements.
> 
> Just my 2 Cents :)
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> 

forgot this one...

http://www.drbd.org/users-guide/s-handling-disk-errors.html