- If you are frugal a 128 GB 2.5" drive might be sufficient as a boot notebook or server hard disk
- But the SSD price is still hovering between 400 and 700 CHF (1 CHF is about 1 USD)
- By comparison a 16MB cache, 500GB Seagate Momentus 2.5 spinning disk costs only 130 CHF (130 USD)
- The latest generation of drives now promise to be faster than their spinning counterparts. Claimed performance is now over 200MB/s read and 150MB/s write. Well allegedly (I mean excluding stuttering, multiple firmware problems, and badly designed notebook SATA interfaces)
Because of the expense there is growing interest in using the SSD as an intelligent cache to the rest of your computer disks. Here is a quick survey of the options
You need an Adaptec Series 2, Series 5 and Series 5Z Unified Serial Storage Controller
You get some software and an Adaptec SSD used to cache read write operations to a specific disk array. The limitations are:
- You may not change the supplied 32GB SSD drive for another
- The SSD is used to cache a particular RAID array. So if you create multiple arrays or are using RAID0 you have to choose which array to cache.
- It is a 1000 CHF / USD add on, so not exactly a bargain
Toms hardware MaxIQ review
For some new laptops Lenovo is adding a 32GB or 64GB SSD drive on a PCiE interface in conjunction with the normal 2.5" spinning hard disk. Some low level software is presumably responsible for shuffling the most active data onto the SSD and de-staging it to spinning disk as necessary.
Raidon HyBrid Disk
No information yet
I like this solution because it is inexpensive, although you do have to buy the expensive SSD. The review below does show performance benefits. I particularly like the design decision that means that all disk writes go straight to hard disk.
Any other Business
I will not dwell on the reverse (and insane) solutions which aggregate SSD disks into an ever more expensive solution. Examples OCZ Colossus, RAMSAN disks
Spending My own money!
It's really my money that I am spending. So IMHO the way forward is still
- It goes without saying that OSX/ Windows users can make use of RAM rich environments to eliminate application paging as well as technologies likeReadyBoost
- Not to use any of the above caching solutions, since the cost of SSD is still unacceptably high.
- For desktop computers invest in a 15K SAS disk and controller
- Or invest in a spinning WD VelociRaptor
- For notebooks, keep the faith, keep your disk defragged with Auslogics or similar
- When the insanely high SSD prices drop to less than 2x spinning then think again.