RE: mongo_copy: cp: cannot stat `/mnt/testfs/testdir0-0-0/f92': Input/output error

["David Dabbs" <david@dabbs.net>]

Something to add regarding the following errors from last night:

cp: cannot stat `/mnt/testfs/testdir0-0-0/f92': Input/output error

As part of my mongo benchmarking, I have added two steps before all other
processing:

1. Create a large number of directories on the benchmark device. These are
taken from a list of actual directories on my machine and are created under
the mount point for the test device e.g. my /etc becomes /mnt/testfs/etc. 

2. Create a large number of files on the test device. This is done using a
modified version of one of the mongo_ programs. Each file is simply created
by open(O_CREAT) then closed immediately. I can't tell you how many files
are created right now because I'm in the middle of running an ext3
benchmark, but it is a large number of files, each zero length. No shipped
mongo sources were changed, save mongo.pl (to include the new phases) and an
added LOG statement so I can watch each iteration command execute.

I spend a long time last night retesting mongo runs with and without the
MKDIRS and MKFILES phases to see if they had contributed to the errors, but
could not find any relationship.

I hope this helps in some way.


David