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Re: Rm performance issue

From: Philip Rowlands
Subject: Re: Rm performance issue
Date: Wed, 26 Sep 2007 13:43:27 +0100 (BST)

On Wed, 26 Sep 2007, Ken Naim wrote:

I am removing 300gb of data spread across 130 files within a single
directory and the process take just over 2 hours. In my past experiences
removing a small number of large files was very quick, almost instantaneous.
I am running red hat Linux on ibm p series hardware against a san with sata
and fiber drives. I see this issue on both the sata and fiber side although
the rm process is slightly faster on fiber.

It's more likely to be caused by your storage system than rm, but here's how to tell:

mkdir foo
touch foo/{a,b,c,d,e,f}
strace -T -e trace=file rm -rf foo

Try this in a temporary directory on your local disk, to get some idea of how long the unlink(2) system call takes. Then try the strace on your slow-running rm command, and see how long rm is spending waiting for the system call to complete.


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