From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx07.extmail.prod.ext.phx2.redhat.com [10.5.110.31]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id v01EOJYk011840 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Sun, 1 Jan 2017 09:24:19 -0500 Received: from mail.reox.at (mail.reox.at [88.198.22.87]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 774BAC04B93B for ; Sun, 1 Jan 2017 14:24:18 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mail.reox.at (Postfix) with ESMTP id 5836058CDD0 for ; Sun, 1 Jan 2017 15:15:17 +0100 (CET) Received: from mail.reox.at ([127.0.0.1]) by localhost (mail.reox.at [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id e4xl-br7Ps6E for ; Sun, 1 Jan 2017 15:15:16 +0100 (CET) Received: from cebalrai (93-82-3-45.adsl.highway.telekom.at [93.82.3.45]) by mail.reox.at (Postfix) with ESMTPSA id 6298858CDCE for ; Sun, 1 Jan 2017 15:15:16 +0100 (CET) Date: Sun, 1 Jan 2017 15:15:14 +0100 From: Sebastian Bachmann Message-ID: <20170101141514.jnazw5dd4kfpcip4@cebalrai> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="76yj7wzi3uforri6" Content-Disposition: inline Subject: [linux-lvm] Change stripe cache for lvm raid5 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: To: linux-lvm@redhat.com --76yj7wzi3uforri6 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi! I'm using a LVM RAID5 on a machine but the write performance is pretty poor (about 20-30MB/s), where the read performance is quite good (about 280MB/s). I read about the stripe_cache_size for md raid and as far as I understand LVM raid, it uses md as well. In the design document for lvm2-raid (https://git.fedorahosted.org/cgit/lvm2.git/tree/doc/lvm2-raid.txt) I can find that a option --stripecache is specified there, but as it seems those options were never implemented. Is it possible to set the stripe cache size somewhere else? It seems to me that lvm2 uses dmsetup to create the raid, where a stripe cache can be set while creation. But it seems to me there is no interface to change such values later on? Thanks in advance! regards Sebastian --76yj7wzi3uforri6 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEZFa7XEAmJF3nZlHUb9vYxvk7X4sFAlhpDu8ACgkQb9vYxvk7 X4uC3Q//Se8E/NnZr20MVLeG1Y4WAK/Xk9kiA2gUW5+SsgqxeekOgFyDqidp0r4N 3b8n9guP7TLBCChIovcNyTQ0iaL2aOcdjaXVDxrPnNqY7IukFQ+BNaMQkfagpfMR Zo5JIr9mgbAK8ATo/l1TgntH/flsZ8bhw85Jjl9bBSzIgRuvFklPB79Uob6yBDRY f13iz7dCVtWydoG0ismzRA6Q5RJFv9EcTKTCiSSLHAntb3ky5OCLntQuLrqJmwHs p+LF/XZ6FjVeNZ6ggTTtXDUkpcrgMzpG+s1dkP/kKhqLSSdTbFqdwKVyDgVdnoBg oeaFOtseYTgy2+hX1eZq2FRAvBfp48dR7k5Bqn91j2J67G1QnLfSW1aoqNriAko6 3muPTVtAeQjzOcadlEKZc1sX6hhV4lvUK6NPopDnUWIOMwMFRpE76ukFbUKz1Eoq wBE5t2zPg7XScattEo+3mLOYX7SALGmXuD+Tg+3a41RuJtZCP2Obm3lvIRLu/GXR Ag/GTLrz0sP9SPEdm1f4z0CJo/ddUo1WV0FcIdPiPyl9KHAZEWarf0L17/tuP/nu NgcVEdc/p8XOOZfe7bvLy7iL5V9uYBg3IJR64/QbJE6sKAm1VmRktf5saYCuTldA VhVgiELVZD8cuKma65qLlRFYyPPxkoUSs7S+/MjqnB6LqdJwxI0= =baAb -----END PGP SIGNATURE----- --76yj7wzi3uforri6--