Re: ZFS or UFS? Solaris 11 or better stay with Solaris 10?
- From: przemolicc@xxxxxxxxx
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 29 Mar 2012 14:22:08 +0200
On Thu, Mar 29, 2012 at 08:21:22PM +1000, De DBA wrote:
> Thanks, Przemyslaw
>
> When I said that the system won't be able to be upgraded, I was not thinking
> of technical complications. Rather, the importance of this 24/7 database and
> the jitter factor associated with an upgrade project this size will encourage
> the management to sit it out as long as possible. Live Upgrade is not going
> to help there.. ;)
>
> We need to strike a balance between two conflicting interests here:
>
> 1. Install the newest possible software, so that the system will have the
> longest possible period into the future of active vendor support
Until you find a bug (don't expect no bugs in a long periods). And the effort
to install fixes is almost the same as in upgrade to newer release. In both
cases you use LU ...
> 2. Deliver the most stable and robust solution possible so that the system
> will suffer as few hickups as possible.
>
> In this light ZFS sounded not like there was an overriding reason to use it,
> as we do not need any of the extra features that it offers. It is young and
> not necessarily stable, and therefore an unknown risk. In the meantime we
> have decided to give the older and better understood ASM a go (thanks Frits,
> for reminding me of it).
>
> You are right, Solaris 11 is also squeakingly new, just out of the
> shrinkwrap. But, if I understand correctly, its new features have had a good
> flogging in the wild through the OpenSolaris Project and Solaris 11 Express
> (which is now replaced by Sol11), have they not? So the risk is smaller than
> it seems at first glance, and it stands to reason that Oracle/Sun will put
> more effort towards fixing OS bugs in this new OS, rather than old, trusty
> Sol10. Our project will include a good volume testing phase, which should
> expose serious flaws (if any) and the entire project will not end until the
> second half of this year. Based on previous experience, I would expect that
> Oracle/Sun release an update before that.. ;)
Well, because of OpenSolaris/Solaris 11 Express I believe that it is better
tested then any other OS which gets to the market. But I don't believe that
Solaris 11 + Oracle 11 is also so well tested ...
You don't want to use ZFS beacuse it is young. ZFS is much more mature then
Solaris 11 ... ;-) (just kidding but ...)
You insist on stability so Solaris 10 is IMHO better choice.
Regards
Przemyslaw Bak (przemol)
--
http://przemol.blogspot.com/
>
> Cheers,
> Tony
>
>
> On 29/03/12 17:41, przemolicc@xxxxxxxxx wrote:
>> Hi Tony,
>>
>> - regarding UFS vs ZFS. The best thing is to do any (!) sort of tests. But
>> if you really cannot do This is really difficult question since:
>> - zfs is brand new filesystem which will be improved more and more. UFS
>> will not be improved.
>> - but does it matter for you if you will keep this system for
>> years without change ?
>> - zfs has much more features which are unknown for UFS (and never will
>> be)
>> - but do you really need them ?
>> - if you insist on using ZFS for Oracle read the following URL:
>> http://www.solarisinternals.com/wiki/index.php/ZFS_for_Databases#Oracle_Considerations
>> - there are a lot of knowledge (in terms of people experience) in the
>> internet about using UFS + Oracle
>> - if you can do any sort of tests (ZFS vs UFS):
>> - you can do it on both ZFS and UFS using:
>> - Orion (Oracle tool to test storage performance)
>> - of course don't relay on just one tool and
>> its results
>> - Oracle 11 IO calibration (new feature)
>> and just compare the results
>> - a couple of URLs:
>> - https://blogs.oracle.com/roch/entry/zfs_and_directio
>>
>> - regarding Solaris 10 vs 11
>> - Solaris 11 has many new features. You can read WPs about What's new,
>> etc. It's worth reading.
>> - but do you need them for typical OLTP (DSS ?) environment ?
>> - Solaris 10 is stable and predictable
>> - but does it matter for you ? Maybe you like new environments
>> ? New features ?
>> - having Solaris 10 does not mean that you cannot upgrade to
>> Solaris 11 in the future. Live Upgrade is a feature which helps you in this
>> area.
>> - if you happen to have a bug in Solaris 11 Oracle support is not known
>> to be the best on this planet regarding fixing new bugs ...
>>
>> - regarding SAN
>> - if you have typical hardware array I would not mirror at the
>> filesystem level - don't complicate this.
>> - quite old but anyway ...
>> http://storagemojo.com/2007/04/23/new-zfs-performance-numbers/
>>
>> Best regards
>> Przemyslaw Bak (przemol)
>> --
>> http://przemol.blogspot.com/
>>
>
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