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Notes:
Cloning with a system backup (mksysb) from a 64-bit enabled JFS2 system to a 32-bit system will fail.
Unlike the JFS file system, the JFS2 file system will not allow the link() API to be used on files of type directory. This limitation may cause some applications that operate correctly on a JFS file system to fail on a JFS2 file system.
The following table provides a summary of JFS and JFS2 functions:
Functions JFS2 JFS
Fragments/Block Size 512-4096 Block sizes 512-4096 Frags
Maximum file system size 1 Terabyte 1 Terabyte
Maximum file size 1 Terabyte 64 GBytes
Number of i-nodes Dynamic, limited by disk space Fixed, set at file system creation
Directory organization B-tree Linear
Online defragmentation Yes Yes
namefs Yes Yes
DMAPI No Yes
Compression No Yes
Quotas No Yes
Deferred update No Yes
AIX 5L Changes to the dd Command
The dd command now supports multiple volume spanning by using the span=yes or span=no options. When the span=no option is used, the dd command works as the default without spanning.
The dd command can span across devices if the input file is larger than the output device physical size.
Syntax
dd[if=InputFile] [of=OutputFile] [cbs=Number] [fskip=Number] [skip=Number] [seek=Number] [count=Number] [bs=Number] [span=yes|no] [ibs=Number] [obs=Number] [files=Number] [conv=Parameter[, ...]]
The span=yes|no flag allows you to span across devices if yes is specified. If no is specified, it works as the default.
Note: Use care when selecting the block size. An incorrect value can cause data inconsistency or overlap. The correct block size is a multiple of the physical volume size. In addition, label each volume consecutively so that the volumes can be restored in the correct order.
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