} -----Original Message----- } From: Keld Simonsen [mailto:keld@xxxxxxxxxx] } Sent: Sunday, March 07, 2010 3:07 AM } To: Neil Brown } Cc: Guy Watkins; 'Greg Freemyer'; 'Mark Knecht'; 'Linux-RAID' } Subject: Re: What RAID type and why? } } On Sun, Mar 07, 2010 at 01:21:13PM +1100, Neil Brown wrote: } > On Sat, 06 Mar 2010 18:17:44 -0500 } > "Guy Watkins" <linux-raid@xxxxxxxxxxxxxxxx> wrote: } > } > > } } > > } At a minimum I would build a 3-disk raid 6. raid 6 does a lot of } i/o } > > } which may be a problem. } > > } > > If he only needs 3 drives I would recommend RAID1. Can still loose 2 } drives } > > and you don't have the RAID6 I/O overhead. } > > } > } > and as md/raid6 requires at least 4 drives, RAID1 is not just the best } > solution to survive two failures on a 3-device array, it is the only } solution. } } Raid10 can also do it. } } raid1 is in many ways obsolete and you should rather use raid10, } which in my eyeys is just another way of doing the same conceptual thing } as raid1. } } Best regards } keld Are you sure RAID10 can loose 2 of 3 drives? I did not think it worked that way. I thought RAID10 maintained 2 copies, not 3. But I have never used RAID10. Guy -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
