diskstats - sectors written, what does it mean for mmc-cards?
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From: Clemens Eisserer on 12 May 2010 11:30 Hi, I have a small arm based server running enterly from an mmc-card. To get some glue how much the mmc-card is written to, I had a look at diskstat, which, after 9 days uptime, looks like: 254 0 mmcblk0 87047 34549 2851200 3081695 483009 484000 7736450 30472168 0 5847544 51650 254 1 mmcblk0p1 63356 2037674 920699 7365592 254 2 mmcblk0p2 58214 813270 46364 370858 So, to mmcblk0 7736450 sectors have been written, and the kernel had to wait 5,7h for the writes to complete. But how can I find out how large a sector is? If I assume its 512 bytes, that would mean 3,8gb have been written to that card in the last few days, which seems quite a lot. Thanks, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: Clemens Eisserer on 13 May 2010 03:40
Does really nobody know how large a mmc-sector is, reported by diskstat? - Clemens 2010/5/12 Clemens Eisserer <linuxhippy(a)gmail.com>: > Hi, > > I have a small arm based server running enterly from an mmc-card. > To get some glue how much the mmc-card is written to, I had a look at > diskstat, which, after 9 days uptime, looks like: > > 254 0 mmcblk0 87047 34549 2851200 3081695 483009 484000 7736450 > 30472168 0 5847544 51650 > 254 1 mmcblk0p1 63356 2037674 920699 7365592 > 254 2 mmcblk0p2 58214 813270 46364 370858 > > So, to mmcblk0 7736450 sectors have been written, and the kernel had > to wait 5,7h for the writes to complete. > But how can I find out how large a sector is? > > If I assume its 512 bytes, that would mean 3,8gb have been written to > that card in the last few days, which seems quite a lot. > > Thanks, Clemens > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |