[OpenIndiana-discuss] 3x LSI 9211-8i controllers + direct attach backplane -- appear as on controller

[Jason J. W. Williams]

It would be nice if disk manufacturers offered firmware flavors with quick fail timeouts/reduced retries on failed read/write ops. Along the lines of the firmware loads they give array OEMs. 

-J

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On Nov 18, 2011, at 15:48, Mark <mark0x01 at gmail.com> wrote:

> On 18/11/2011 12:51 a.m., Rich wrote:
>> On Wed, Nov 16, 2011 at 11:52 PM, Eric D. Mudama
>> <edmudama at bounceswoosh.org>  wrote:
>>> On Wed, Nov 16 at 13:47, Bill Sommerfeld wrote:
>>>> 
>>>> On 11/16/11 13:27, James C. McPherson wrote:
>>>>> 
>>>>> (and apart from "I don't understand
>>>>> it therefore it must be bad" I don't know why you really would)
>>>> 
>>>> I don't like mpxio disk names -- they make me work too hard and create
>>>> fear of
>>>> doing the wrong thing.
>>>> 
>>>> Long hex strings are much harder to distinguish than short strings and
>>>> it's
>>>> much easier to get confused between two devices.  humans are reasonably
>>>> good
>>>> at dealing with dense sets of small integers, and not quite so good at
>>>> dealing
>>>> with sparse sets of 64-bit and 128-bit values.
>>>> 
>>>> are c2t5000C5002C68468Bd0 and c2t5000C5002C68468Bd0 the same or different?
>>>> what about c2t5000C5002C68203Bd0 and c2t5000C5002C689ABFd0?
>>>> 
>>>> are c2t5d0s0 and c2t6d0s0 the same or different?  how about sd5a and sd5a?
>>>> 
>>>> how much time did each of those comparisons take you?  how quickly were
>>>> you
>>>> sure of your answer?
>>> 
>>> The important part to me is that the 000C5002C68468B above is
>>> typically printed on the label of the drive.  Put a little sticker on
>>> your sled with the contained WWN, and you won't make the mistake of
>>> grabbing the wrong drive from the array again. (They need a support
>>> group for that)
>> 
>> SES means you can blink the drive LED and, with a convenient mapping
>> method, not have this issue again. :)
>> 
>> - Rich
> A simple "locate" application is still elusive, inspite of SES.
> 
> And LSI 6G SAS controllers lack SES support in the IT firmware, so I run mine in IR mode (with no raid defined).
> 
> A single bad disk (SATA, SAS or FC) still stops the server dead while it retries. ZFS really could do with kernel and driver tuning.
> With a raid system, ignore a read error and just correct and deliver the data, and then write it back which in most cases triggers a disk bad sector replacement and the problem is sorted quickly.
> 
> Mark.
> 
> 
> 
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