[gpfsug-discuss] SOBAR restore with new blocksize and/or inodesize

[Marc A Kaplan]

This redbook

http://w3-03.ibm.com/support/techdocs/atsmastr.nsf/3af3af29ce1f19cf86256c7100727a9f/335d8a48048ea78d85258059006dad33/$FILE/SOBAR_Migration_SpectrumScale_v1.0.pdf

has these and other hints:

-B blocksize, should match the file system block size of the source 
system, but can also be larger (not smaller). To obtain the file system 
block size in the source system use the command: mmlsfs -B 

-i inodesize, should match the file system inode size of the source 
system, but can also be larger (not smaller). To obtain the inode size in 
the source system use the following command: mmlsfs -i. Note, in Spectrum 
Scale it is recommended to use a inodesize of 4K because this well aligns 
to disk I/O. Our tests have shown that having a greater inode size on the 
target than on the source works as well. 

If you really want to shrink the blocksize, some internal testing 
indicates that works also. 
Shrinking the inodesize also works, although this will impact the 
efficiency of small file and extended attributes in-the-inode support.


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