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From: Yuriy Umanets <Yury.Umanets@Sun.COM>
To: lustre-devel@lists.lustre.org
Subject: [Lustre-devel] storing SOM epoch in EA
Date: Tue, 19 Feb 2008 17:10:08 +0200	[thread overview]
Message-ID: <47BAF150.70804@sun.com> (raw)
In-Reply-To: <47BAEC01.5050102@sun.com>

Alex Zhuravlev wrote:
> Yuriy Umanets wrote:
>   
>> Yes, this is what I understand as well. And we were discussing that EA 
>> approach has some downsides. In fact what you propose, that is, store it 
>> in EA is logical taking into account that epoch is kind of extension to 
>> inode fields. It is property of inode-object. It is logical to store it 
>> with inode, I see your point. But as we saw, this has/may have some 
>> downsides which may be solved with IAM. Just take this in mind when you 
>> think/work on it. I do not see why IAM is such a bad here.
>>     
>
> 1) additional seek(s)
> 2) shared structure (additional cost on concurrent access)
> 3) inode is already 512 bytes
>
>   
Agreed, but this is all not measured and may happen that IAM is not 
worse but more handy in many respects.

Thanks.
> thanks, Alex
>
>
>
> _______________________________________________
> Lustre-devel mailing list
> Lustre-devel at lists.lustre.org
> http://lists.lustre.org/mailman/listinfo/lustre-devel
>   


-- 
umka

  reply	other threads:[~2008-02-19 15:10 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-19  9:48 [Lustre-devel] storing SOM epoch in EA Alex Zhuravlev
2008-02-19 10:28 ` Yuriy Umanets
2008-02-19 10:30   ` Alex Zhuravlev
2008-02-19 10:38     ` Yuriy Umanets
2008-02-19 10:59   ` Vitaly Fertman
2008-02-19 11:11     ` Yuriy Umanets
2008-02-19 11:18       ` Alex Zhuravlev
2008-02-19 12:02         ` Yuriy Umanets
2008-02-19 12:09           ` Alex Zhuravlev
2008-02-19 14:28             ` Yuriy Umanets
2008-02-19 14:47               ` Alex Zhuravlev
2008-02-19 15:10                 ` Yuriy Umanets [this message]
2008-02-19 12:13           ` Alex Zhuravlev
2008-02-19 14:30             ` Yuriy Umanets
2008-02-19 14:36               ` Nikita Danilov
2008-02-19 14:44                 ` Yuriy Umanets
2008-02-19 14:39               ` Yuriy Umanets
2008-02-19 14:42               ` Alex Zhuravlev
2008-02-19 20:13               ` Andreas Dilger
2008-02-19 14:59           ` Mikhail Pershin
2008-02-19 15:11             ` Kalpak Shah
2008-02-19 15:23               ` Ricardo M. Correia
2008-02-19 15:14             ` Yuriy Umanets
2008-02-19 15:19               ` Alex Zhuravlev
2008-02-19 15:28               ` Vitaly Fertman
2008-02-19 15:18             ` Ricardo M. Correia
2008-02-19 16:21         ` Nikita Danilov
2008-02-19 16:27           ` Alex Zhuravlev
2008-02-20 16:10             ` Nikita Danilov
2008-02-19 15:31 ` Eric Barton
2008-02-19 15:42   ` Alex Zhuravlev
2008-02-19 20:19   ` Andreas Dilger
2008-02-19 20:33 ` [Lustre-devel] on-disk SOM attributes [former storing SOM epoch in EA] Vitaly Fertman

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