On 1/4/2012 6:41 AM, Mark Wendt wrote: > On 01/04/2012 06:33 AM, Les Newell wrote: >> That is a good article. I do most of that apart from changing the I/O >> scheduler. For reliability I leave journaling on. >> >> Les >> > Yep, but the journaling will eventually eat your disk up. It's a > trade-off. Longevity of the device vs reliability of the OS. > > Mark > Gentle persons:
There's two different phenomena going on with SSDs. Let's not confuse them. On the one hand, there is the well-known and understood problem that they have limited write endurance. It is easy to compute a useful life knowing your disk usage pattern and taking precautions such those in the referenced article (which info was already covered on our Wiki three years ago thanks to Les, by the way, albeit hidden under Installing to Compact Flash). IMHO this can not be considered a reliability issue. On the other hand, there is the evolving and poorly understood problem of premature failure (e.g., failure well before expected from cycle wear-out or manufacturer's claimed MTTF/MTBF). It is impossible to compute a useful life against these failures, which occur for a variety of reasons. IMHO this is exactly the reliability issue. Again, I recommend reading at least the Tom's Hardware summary http://www.tomshardware.com/reviews/ssd-reliability-failure-rate,2923-3.html It draws on collected experiences with hundreds and thousands of SSDs. Bottom line for me: I use one for a variety of reasons---size, power, speed, physical toughness---and I take precautions knowing it will inevitably fail before I expect it to. Regards, Kent ------------------------------------------------------------------------------ Ridiculously easy VDI. With Citrix VDI-in-a-Box, you don't need a complex infrastructure or vast IT resources to deliver seamless, secure access to virtual desktops. With this all-in-one solution, easily deploy virtual desktops for less than the cost of PCs and save 60% on VDI infrastructure costs. Try it free! http://p.sf.net/sfu/Citrix-VDIinabox _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
