From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (mx1.redhat.com [172.16.48.31]) by int-mx1.corp.redhat.com (8.11.6/8.11.6) with ESMTP id j1RNi9K27740 for ; Sun, 27 Feb 2005 18:44:09 -0500 Received: from Datawav.net ([63.228.244.4]) by mx1.redhat.com (8.12.11/8.12.11) with ESMTP id j1RNi7gK020198 for ; Sun, 27 Feb 2005 18:44:08 -0500 Message-ID: <4222541B.40206@theserrs.net> Date: Sun, 27 Feb 2005 16:13:31 -0700 From: Scott Serr MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [linux-lvm] lvm over raid5 - sizes Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: LVM general discussion and development I have alot of ideas going through my head. Here is my situation: I've had 5 IDEs with 4 partitions each. Each partition is in a RAID5 md:stripped. md0 = hda5, hdb5, hdc5, hdd5, hde5 md1 = hda6, hdb6, hdc6, hdd6, hde6 md2 = hda7, hdb7, hdc7, hdd7 md3 = hda8, hdb8, hdc8, hdd8 md0-3 are in an LVM2 volume group. This makes it really nice when expanding or adding another disk because I just pull say md3 out of the volume group... rebuild md3 bigger and then add it back. I just upgraded, replacing hde with a bigger disk and while the pvmoves are taking FOREVER... I thought what is the right size for the RAID5 chunk-size? I have chunk-size = 128k right now. The pv extents size is (always?) 4MB. Am I just shooting myself in the foot by not making my RAID chunk size atleast 1MB? Can someone give me a reason to increase it? BTW, I'm using reiserfs with default sizes and my needs are mixed. I have many couple gig files, but also some "rsyncs" of client machines as backups/archives. Thanks for any ideas, Scott