So, I've got a zabbix server here which has a mysql database that is doing about 5,000-10,000 wsec/sec, which is around 2.5-5.0MB/sec if my math is correct and that works out to 73TB/year of writes (and the database is only 32GB).
Can I use a Flash SSD anywhere in this use case? On Mon, 14 Sep 2009, Stephen Johnson wrote: > On Sat, 2009-09-12 at 08:16 -0700, Dave Close wrote: >> Flash reads are reasonably fast, I agree. Writes are not in my >> experience. And one probably writes to swap at least as often as >> one reads from it. >> >> "Years" sounds like a long time. But many embedded systems are >> intended to remain in service for ten years or more. A worn-out >> flash memory after eight years (for example) would not be fun. > > I find that people tend to underestimate how much actual data would be > required to wear out flash. I did a calculation back when I was more > involved with the handhelds.org project(s). Major thing at the time was > porting the kernel and setting up a distribution for the Compaq IPAQ and > other PDA. The first Ipaq has 16 MB of flash. Assuming a modest amount > of re-writes for Flash of that era. One would have to write 1.6 TB of > data to wear out the flash. And using something like JFFS2 on the flash, > the effect amount of written data is easily double that. > > When people think about the ramifications of writing over a TB of data > to handheld PDA, they realize their fears were a bit silly. I'll admit I > was worried about wearing out the flash of my IPAQ before I did the > math. Even reflashing it a few hundred times, the IPAQ would be obsolete > long before I wore out the flash in it. > -- > Stephen Johnson <[email protected]> > > _______________________________________________ > Discuss mailing list > [email protected] > http://lopsa.org/cgi-bin/mailman/listinfo/discuss > This list provided by the League of Professional System Administrators > http://lopsa.org/ > _______________________________________________ Discuss mailing list [email protected] http://lopsa.org/cgi-bin/mailman/listinfo/discuss This list provided by the League of Professional System Administrators http://lopsa.org/
