From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Monnerie Subject: Re: raid10n2/xfs setup guidance on write-cache/barrier Date: Fri, 16 Mar 2012 12:06:54 +0100 Message-ID: <3633779.GerkmFcqtU@saturn> References: <20322.29849.917554.794740@tree.ty.sabi.co.UK> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart2250665.9ql0y8N4me"; micalg="pgp-sha1"; protocol="application/pgp-signature" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: xfs@oss.sgi.com Cc: Jessie Evangelista , Peter Grandi , Linux RAID List-Id: linux-raid.ids --nextPart2250665.9ql0y8N4me Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Am Freitag, 16. M=C3=A4rz 2012, 11:36:07 schrieb Jessie Evangelista: > If you were in my place with the resource constraints, you'd go with:= > xfs with barriers on top of mdraid10 with device cache ON and setting= > vm/dirty_bytes, vm/dirty_background_bytes, vm/dirty_expire_centisecs,= > vm/dirty_writeback_centisecs to safe values If you ever experienced a crash where lots of sensible and important=20= data were lost, you would not even think about "device cache ON". > could you please suggest a hardware raid card with BBU that's cheap? "Cheap" is a varying definition. How much is your data worth? How much=20= does one day of blackout cost?=20 I've been very happy with Areca Controllers, like the 12x0 and 1680=20 series, and now there's the newer 1882 series like=20 http://geizhals.at/eu/721745 plus a BBU for about 100=E2=82=AC. You can even mix RAID levels on the same disks, example of 8x1TB define= =20 a RAID0 of 500G and the rest a RAID6. Online expansion possible,=20 scheduled background verify, e-mail notification on everything, logging= ,=20 ntp times, oob-mgmnt via it's own network interface, ... Very reliable, I never had a problem. And they have a good support team= . --=20 mit freundlichen Gr=C3=BCssen, Michael Monnerie, Ing. BSc it-management Internet Services: Prot=C3=A9ger http://proteger.at [gesprochen: Prot-e-schee] Tel: +43 660 / 415 6531 --nextPart2250665.9ql0y8N4me Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) iEYEABECAAYFAk9jHtMACgkQzhSR9xwSCbRr5gCdFsTbgI5PSGoK/QZs18dY3Z5g +YIAoJTOux9xS23y4jSC0sWAz++hYSvw =hmCD -----END PGP SIGNATURE----- --nextPart2250665.9ql0y8N4me--