> 1. I also added mount option 'compression=lzo' and 'io_cache' to /home at 
> first.

Neither io_cache nor compression=lzo are options that exist.  You
probably meant compress=lzo for the first, but I really don't know
what you wanted for io_cache (inode_cache?  that's not really a
performance thing)

You need to check what the actual parameters are before you change
things.  Making stuff up simply doesn't work.
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