The symposium example seems a classic case of selection bias.

[RC]

Sent from my iPhone

On Oct 5, 2011, at 12:14, Remco Post <r.post AT PLCS DOT NL> wrote:

> Hi,
>
> I saw last week that about half of the people visiting the TSM Symposium were 
> running V6, it's been stable for me so far.
>
> The likeliness of an accidental SHA1 hash collision is relatively small even 
> compared to the total number of objects that a TSM server could possibly ever 
> store during its entire lifetime, insignificant. That being said, if you 
> think that your data is to valuable to even risk that, don't dedup.
>
>
> --
>
> Gr., Remco
>
> Op 5 okt. 2011 om 19:24 heeft Shawn Drew <shawn.drew AT AMERICAS.BNPPARIBAS 
> DOT COM> het volgende geschreven:
>
>> Along this line, we are still using TSM5.5   Some of the features
>> mentioned previously require TSM6.  TSM6 still feels risky to me.  Maybe
>> more risky than a hash collision.
>> Just looking for a consensus, Do people think its mature enough now that
>> it is as stable/reliable as TSM5 ?
>>
>> PS. Test restores are the only way to be sure your backups are good.  You
>> shouldn't just "trust" TSM.
>>
>> Regards,
>> Shawn
>> ________________________________________________
>> Shawn Drew
>>
>>
>>
>>
>>
>> Internet
>> rrhodes AT FIRSTENERGYCORP DOT COM
>>
>> Sent by: ADSM-L AT VM.MARIST DOT EDU
>> 10/05/2011 11:03 AM
>> Please respond to
>> ADSM-L AT VM.MARIST DOT EDU
>>
>>
>> To
>> ADSM-L
>> cc
>>
>> Subject
>> Re: [ADSM-L] Ang: Re: [ADSM-L] Ang: Re: [ADSM-L] Ang: Re: [ADSM-L] Ang:
>> Re: [ADSM-L] Ang: Re: [ADSM-L] Ang: Re: [ADSM-L] Ang: Re: [ADSM-L] vtl
>> versus file systems for pirmary pool
>>
>>
>>
>>
>>
>>
>>> When TSM is duplicating your data (aka backing
>>> up storage pools), there is no logical connection between your
>>> primary storage pool and your copypool.
>>
>> Well . . .yes . .. no . . .
>>
>> All our eggs are in one basket no matter what.  The logical connection
>> between pri and copy pools is TSM itself.  A logical corruption in TSM can
>> take out both. Your data could be sitting there on tape and completely
>> useless.  Yes, that's why we have TSM db backups, but are they good?  What
>> if there is a TSM bug that renders all your backups bad - we don't find
>> out until we need it!
>>
>> At some point you have to trust something.  We all trust TSM.  Yes, we do
>> the db backup, create pri and copy pools, use reuse delay . . .everything
>> to allow for problems . . . but we are still trusting that TSM workss as
>> advertised.  A really, really paranoid would run two complete
>> separate/different backup systems - but who can afford that, or want to?
>> But then, we do do that for our biggest SAP/ORacle systems.  We use
>> Oracle/RMAN-to-flasharea/RMAN-to-TDPO/TSM, but we also run EMC/clone
>> backups off our DR sites R2's . . but also to TSM.
>>
>>
>> Rick
>>
>>
>>
>>
>>
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