From mboxrd@z Thu Jan 1 00:00:00 1970 From: Asdo Subject: Re: Array 'freezes' for some time after large writes? Date: Wed, 31 Mar 2010 18:37:42 +0200 Message-ID: <4BB37A56.80008@shiftmail.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-reply-to: Sender: linux-raid-owner@vger.kernel.org To: Jim Duchek Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Jim Duchek wrote: > Hi all. Regularly after a large write to the disk (untarring a very > large file, etc), my RAID5 will 'freeze' for a period of time -- > perhaps around a minute. My system is completely responsive otherwise > during this time, Why don't you cat /proc//stack to see what was the process doing? Maybe more than once to see if it hangs always on the same syscalls... I believe this is more useful if there is only 1 access to the array, not concurrent access. You need to freeze it with e.g. the tar only, This might identify filesystem problems. Other problems might be more difficult.