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the new ssd is much faster
I do have one more sata port available and was entertaining reusing the 'old' ssd when the new one was up and running.
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the OS will be on the "old" SSD. (mount point /)
your data will be on the "new" SSD. (mount point /home)
performance:
your OS is on the slower, older SSD. there is not a lot of downside to this.
your data is on the faster, newer SSD. this is good.
your reads/writes are now spread across two SATA interfaces, which will be faster.
recovery:
separation of OS and data makes recovery easier.
old SSD fails? no data lost. get new SSD, install OS, mount /home, you are back in business.
new SSD fails? no problem. get new SSD, restore data from backup using the tools on your current OS. you are back in business.
just remember,
1) if you have enough RAM (4-8GB should do it), don't use swap on an SSD.
2) enable either continuous or periodic TRIM on the SSD; i am a fan of periodic.
ar-jedi