From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Daniel L. Miller" Subject: Re: Grow a RAID-10 Date: Wed, 02 Jul 2008 18:47:31 -0700 Message-ID: <486C2FB3.3050403@amfes.com> References: <486BF974.70508@amfes.com> <20080702231026.GA15028@rap.rap.dk> Reply-To: dmiller@amfes.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <20080702231026.GA15028@rap.rap.dk> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Keld J=F8rn Simonsen wrote: > On Wed, Jul 02, 2008 at 02:56:04PM -0700, Daniel L. Miller wrote: > =20 >> I currently have a RAID10 across (4) SATA drives. It looks like I'm= =20 >> going to need to grow in the near future. Any tips for a procedure = for=20 >> this? My current plan: >> >> 1. Add a PCI SATA controller (MB had 4 SATA + 4 RAID SATA, it's a T= yan=20 >> MB with a NFORCE chipset, I'm not sure if I want/can use the RAID SA= TA=20 >> ports as plain SATA connections). >> =20 > > Why not use the mobo raid sata ports? They are probably faster than a > controller on the pci bus. What kind of pci bus do you have? > > =20 My mistake. Confused this one with another system. Only have 4 ports=20 available. I did have the option of using the Nvidia RAID - which I di= d=20 NOT enable. What "kind" of pci bus? Don't understand the question. If it matters,= =20 it's a Tyan S2892, a "Thunder K8SE". nForce Pro2200 and AMD8131 PCI-X=20 chipsets. > PCI-E 1x is likely to be too slow for a 4-drive raid10,f2 array. > My 4-drive raid10,f2 delivers about 320 MB/s and newer disks should b= e > able to deliver 360 MB/s - well above the 250 MB/s that a PCI-E 1x ca= n > deliver.=20 > > =20 >> 2. Add 2 more drives - not necessarily the same size as the existin= g=20 >> (they were all 4 the same) >> >> 3. Execute "mdadm --grow /dev/md0" >> =20 > > What kind of raid10 do you have?>=20 > =20 I don't understand this question either. mdadm --detail /dev/md0 /dev/md0: Version : 00.90.03 Creation Time : Tue Oct 3 19:11:53 2006 Raid Level : raid10 Array Size : 312581632 (298.10 GiB 320.08 GB) Used Dev Size : 156290816 (149.05 GiB 160.04 GB) Raid Devices : 4 Total Devices : 4 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Jul 2 18:46:15 2008 State : clean Active Devices : 4 Working Devices : 4 Failed Devices : 0 Spare Devices : 0 Layout : near=3D2, far=3D1 Chunk Size : 32K UUID : 9d94b17b:f5fac31a:577c252b:0d4c4b2a Events : 0.10941692 Number Major Minor RaidDevice State 0 8 0 0 active sync /dev/sda 1 8 16 1 active sync /dev/sdb 2 8 32 2 active sync /dev/sdc 3 8 48 3 active sync /dev/sdd --=20 Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html