Denys Vlasenko wrote:
On Sunday 11 November 2007 11:33, Tino Keitel wrote:
The dd command reads 100 MB from each partition two times in a row. It
looks like sda1 and sda2 are not bufferd (the first 4 dd runs), but
sda3 and sda4 are (the last 4 dd runs).
The computer is a Mac mini with a 2,5" SATA hard disk. The first 2
partitions contain EFI and MacOS X, and are unused in Linux. The last 2
partitions are an ext3 partition for / and an LVM for the rest of the
sytem.
Any hints how the dd/buffering behaviour could be explained? The system
was mostly idle, and the numbers are reproducible across reboots.
IIRC only mounted partitions' reads are cached.
Or, in general, those devices which kernel actually "uses" (mounted, but
also LVM, RAID, which don't have to be mounted to get cached).
--
Tomasz Chmielewski
http://lists.wpkg.org
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