Oh dear god, corporate world has been getting to me. Starting to top-post by default, but occasionally catching myself in time...
On Fri, 7 Nov 2014, Toby Corkindale wrote: > >> I have read stories of people spending lots of money on SD cards and > >> finding none of them work, so am a bit nervous about doing this myself. > > > > People buying lots of SD cards and none of them working? What's the one > > common thing amongst all those SD cards? The power supply. > > Oh, one other thing -- I found that overclocking the raspberry pi > caused me sd card corruption too, so if you're hitting issues, try > going back to stock speeds. Interesting. Might still be a power supply issue - more switching transients at higher clock speed. I had overclocked mine, and was using the original SD card I bought from element 14. I loaded munin onto it, and after a while, the latency was increasing to 1 second. I blew it away (not that SD cards support TRIM) and rebuilt it on btrfs, and the response time started increasing to 10 seconds after a few days (the graph almost looked log-linear, ie exponentially increasing latencies as it ran out of blocks to remap to) before it finally went read-only corrupt. The replacement card is working a lot better several months on. But I advocate putting munin on (turn copious logging and logfile sync etc off!) and monitoring disk latencies on all your systems. A Scary Devil Monk this morning showed his munin graphs of a 2 disk system pre- and post- a power failure. His disk whose latencies immediately went up by a factor of 10 turned out to have been a RMA replacement from only 9 months ago. -- Tim Connors _______________________________________________ luv-main mailing list [email protected] http://lists.luv.asn.au/listinfo/luv-main
