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List:       opensolaris-ufs-discuss
Subject:    [ufs-discuss] maxcontig and cgsize
From:       Frank.Batschulat () Sun ! COM (Frank Batschulat)
Date:       2005-08-26 4:11:19
Message-ID: op.sv33the5176b0c () blade
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Ryan,

you may also want to read Sarah's blog about maxcontig
 from back in time when she fixed/changed this:

http://blogs.sun.com/roller/page/sarahsblog?entry=inquiring_minds_want_to_know

---
frankB

On Thu, 25 Aug 2005 23:35:57 +0200, Sarah Jelinek <Sarah.Jelinek@Sun.COM>  
wrote:

> Hi Ryan,
>
> yes, maxcontig can be any positive integer value. maxcontig as of  
> Solaris 10 and Solaris 9 update 7, was decoupled from the i/o transfer  
> size so that we could make it as large as the user wanted.
>
> So, when you say, 'allocating single sequential block extents', do you  
> mean ensuring the reservation of this sequential set of blocks as well?
>
> thanks,
> sarah
> *****
>
> Matty wrote:
>
>>
>> Howdy,
>>
>> I am doing some testing, and wondered if the value assigned to  
>> maxcontig can be larger than the number of logical blocks in a cylinder  
>> group? The mkfs_ufs man page would lead me to believe the answer to my  
>> question is "yes":
>>
>> maxcontig=n     The  maximum  number   of   logical
>>                  blocks, belonging to one file, that
>>                  are  allocated  contiguously.   The
>>                  default is calculated as follows:
>>                  [         ....                    ]
>>
>> I want to see if it's possible to configure UFS to simulate VxFS's  
>> ability to allocate single sequential block extents. We have several  
>> applications that perform large sequential I/O's, and have  
>> significantly increased throughput by allocating one large sequential  
>> extent per file. Can we achieve the same thing by adjusting cgsize and  
>> maxcontig with UFS? Any thoughts or feedback are welcome!
>>
>> Thanks,
>> - Ryan
>> _______________________________________________
>> ufs-discuss mailing list
>> ufs-discuss@opensolaris.org
>
> _______________________________________________
> ufs-discuss mailing list
> ufs-discuss@opensolaris.org


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