From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell Smith Subject: Re: Raid over 48 disks Date: Wed, 19 Dec 2007 12:08:02 +0000 Message-ID: <476909A2.8030502@ukd1.co.uk> References: <200712182350.lBINoMn17765@www.watkins-home.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200712182350.lBINoMn17765@www.watkins-home.com> Sender: linux-raid-owner@vger.kernel.org To: Guy Watkins Cc: 'Brendan Conoboy' , 'Norman Elton' , linux-raid@vger.kernel.org List-Id: linux-raid.ids Guy Watkins wrote: > } -----Original Message----- > } From: linux-raid-owner@vger.kernel.org [mailto:linux-raid- > } owner@vger.kernel.org] On Behalf Of Brendan Conoboy > } Sent: Tuesday, December 18, 2007 3:36 PM > } To: Norman Elton > } Cc: linux-raid@vger.kernel.org > } Subject: Re: Raid over 48 disks > } > } Norman Elton wrote: > } > We're investigating the possibility of running Linux (RHEL) on top of > } > Sun's X4500 Thumper box: > } > > } > http://www.sun.com/servers/x64/x4500/ > } > } Neat- 6 8 port SATA controllers! It'll be worth checking to be sure > } each controller has equal bandwidth. If some controllers are on slower > } buses than others you may want to consider that and balance the md > } device layout. > > Assuming the 6 controllers are equal, I would make 3 16 disk RAID6 arrays > using 2 disks from each controller. That way any 1 controller can fail and > your system will still be running. 6 disks will be used for redundancy. > > Or 6 8 disk RAID6 arrays using 1 disk from each controller). That way any 2 > controllers can fail and your system will still be running. 12 disks will > be used for redundancy. Might be too excessive! > > Combine them into a RAID0 array. > > Guy Sounds interesting! Just out of interest, whats stopping you from using Solaris? Though, I'm curious how md will compare to ZFS performance wise. There is some interesting configuration info / advice for Solaris here: http://www.solarisinternals.com/wiki/index.php/ZFS_Configuration_Guide esp for the X4500. Russell