From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Smith Subject: Re: mdadm + raid1 of 2 disks and now need to add more Date: Tue, 11 Apr 2006 20:32:16 +0000 Message-ID: <20060411203216.GV29446@strugglers.net> References: <20060411145142.GR29446@strugglers.net> <443BE6A6.5000202@unix-scripts.info> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="lRMsAdG4hjP4MFkn" Return-path: Content-Disposition: inline In-Reply-To: <443BE6A6.5000202@unix-scripts.info> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids --lRMsAdG4hjP4MFkn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 11, 2006 at 07:25:58PM +0200, Laurent CARON wrote: > Andy Smith wrote: > >On Tue, Apr 11, 2006 at 04:41:30PM +0200, Shai wrote: > >>I have two SCSI disks on raid1. > >>Since I have lots of reads from that raid, I want to add two more > >>disks to this raid so that read will be faster. > >> > >>How should I add the new disks? > > > >Is this possible with md currently: > > > >Create a RAID-10 on the two new disks specifying one disk missing > >from each mirror. > > > >Then copy data over and add the two existing disks letting it > >resync? >=20 > Why not growing the array with 2 more disks? Well I guess a RAID-1 of 4 disks would be slightly more redundant than a 4 disk RAID-10, but it would have half the capacity, and the read performance would be very similar, no? --lRMsAdG4hjP4MFkn Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFEPBJQIJm2TL8VSQsRAveFAJ4/n2cEFlbiyqOnBk2rhW04E4/3XgCfdfVW TzrfefeU5e52idMiQPjmIb8= =yONf -----END PGP SIGNATURE----- --lRMsAdG4hjP4MFkn--