Re: What's the typical RAID10 setup?
From: Roberto Spadim <hidden>
Date: 2011-02-04 21:13:45
http://www.lsi.com/DistributionSystem/AssetDocument/SCG_LSI_SAS_6Gbps_IR_PB_092909.pdf raid10 = (can use linux raid10 too, but i´m just explaning raid 1+0) mdadm --create /dev/md0 --level=1 --raid-devices 2 /dev/sda /dev/sdb mdadm --create /dev/md1 --level=1 --raid-devices 2 /dev/sdc /dev/sdd mdadm --create /dev/md2 --level=0 --raid-devices 2 /dev/md0 /dev/md1 2011/2/4 Stan Hoeppner [off-list ref]:
Robin Hill put forth on 2/4/2011 10:22 AM:quoted
On Fri Feb 04, 2011 at 11:03:30AM -0500, Phillip Susi wrote:quoted
FYI, you should get in the habit of using your mail client's reply to all function. I did not see this until now because you did not send me a copy.I'll make an exception in this case, but I generally reply to messages on mailing lists to the list only, and I have no plans to change this.quoted
On 2/1/2011 4:20 AM, Robin Hill wrote:quoted
No, it's RAID 10 or RAID 1+0. RAID 0+1 would be 2 mirrored pairs of 5-disk RAID 0 arrays, in which case you could only lose 5 disks ifIn English we read from left to right and top to bottom, so 0+1 means stripe on top of mirror.The vast majority of online sources would disagree with you. See: http://en.wikipedia.org/wiki/Nested_RAID_levels http://www.aput.net/~jheiss/raid10/ http://decipherinfosys.wordpress.com/2008/01/15/difference-between-raid-01-vs-raid-10/ http://www.raid.com/04_01_0_1.html http://www.pcguide.com/ref/hdd/perf/raid/levels/multLevel01-c.html http://www.adrc.com/raid-01.html The order it's written is the order of creation. RAID0+1 = RAID 0, then RAID 1 (mirrored stripes) and RAID1+0 = RAID 1, then RAID 0 (striped mirrors).LSI is the undisputed king of HBA RAID, with all major server OEMs rebadging LSI cards and/or using their storage processor chips on the mobo, including Dell, HP, IBM, Intel, Sun, etc. Note the diagram at the bottom of this PDF showing the layout of RAID 10: http://www.lsi.com/DistributionSystem/AssetDocument/SCG_LSI_SAS_6Gbps_IR_PB_092909.pdf It clearly shows a stripe over two mirrors. -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
-- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html