UFS defragmentation

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Operating Systems Solaris UFS defragmentation
# 1  
Old 06-06-2011
UFS defragmentation

is there any other/better way to defragment the ufs slice instead of backup+restore?
how to tell which slice needs defragmenting?
# 2  
Old 06-06-2011
Usually ufs does not need a lot of defragmentation done to it. If disks are approaching full, i.e. > 90% you can start having problems. If you are on a SAN there is virtually never a worry about fragmentation.

The only real issue with "fragmentation" relates to having a single directory with huge numbers of small files and loads of deletions/additions. This sometimes kills performance on the directory and also the filesystem itself.
# 3  
Old 06-06-2011
a-ha, we have such directory. I'll tar it and remove files. they are some sort of logs, very short text files. thanks.
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