EMMC flash storage wear level

Материал из Wiren Board

eMMC Health Status

The following commands are used to get the estimated wear level of the eMMC flash storage chip used in Wiren Board 5 controllers:


Mount debugfs 

mount -t debugfs none /sys/kernel/debug/


Read the wear level estimation 

cat /sys/kernel/debug/mmc0/mmc0\:0001/ext_csd \
| python -c 'import binascii, sys; print "~%d%% wear" % (ord(binascii.unhexlify(sys.stdin.read().strip())[0x5e])*10)'

Example output: 

~10% wear

The level is returned in multiplies of 10 percent. The minimum wear is 0% (new device), the maximum is supposed to be 100%.


Sources

  • хhttp://eip.dediprog.com/dediprog/get_file.php?path=upload/mcusupport/321/0984d71f2cb0fee63a96cba5943a7d14.PDF&filename=SDIN7DP2-4G.PDF SanDisk SDIN7DP2-4G datasheet]
Источник — https://wirenboard.com/wiki/index.php?title=EMMC_flash_storage_wear_level&oldid=7502