[Lustre-devel] storing SOM epoch in EA

Alex Zhuravlev Alex.Zhuravlev at Sun.COM
Tue Feb 19 04:13:08 PST 2008

btw, are you proposing to store LOV in global IAM?

thanks, Alex

Yuriy Umanets wrote:
> Seriously, IMHO what is bad about EAs:
> 1. You need to control their size, you need to bother;
> 2. Large-fast inodes make create/lookup slow. You need to load this 
> thing to memory after all. I think this is complement to additional 
> seeks caused by IAM;
> 3. Storing epoch in EA makes you use this chain to access epoch: 
> fid->inode->epoch (in EA), IAM makes it shorter: fid->epoch (in IAM);
> 4. Large inodes consume more RAM;
> 5. There others...  but they are less related to technical 
> downsides/advantages so I will omit them.
> Thanks.

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