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| Sun System Handbook - ISO 3.4 June 2011 Internal/Partner Edition | ||
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Solution Type Technical Instruction Sure Solution 1008840.1 : Sun StorEdge[TM] 3310: How are disks mirrored in RAID 1+0?
PreviouslyPublishedAs 212175 Description In an Sun StorEdge[TM] 3310 array, how are the disks mirrored physically? Is RAID-1, when using more than 2 disks, actually RAID 0+1 or RAID 1+0? Steps to Follow When 4 or more physical disks are selected to make a logical disk, and RAID level 1 is selected, the resulting logical disk is implemented as a RAID 1+0, meaning that the resulting logical disk is a stripe of mirrored pairs of physical disks. On the SE3310, the controller uses Channel IDs and Disk IDs to determine which disks become the mirrored pairs. For example, say you select the following 6 disks with which to create a logical disk: CHL0/ID10, CHL2/ID1, CHL0/ID11, CHL2/ID3, CHL0/ID12, and CHL2/ID2. The RAID controller will first order these disks by ChannelID and then DiskID, so the disks will be sorted in the following order: CHL0/ID10, CHL0/ID11, CHL0/ID12, CHL2/ID1, CHL2/ID2, CHL2/ID3 and will then divide this ordered list into two equal parts: Part 1: CHL0/ID10, CHL0/ID11, CHL0/ID12 Part 2: CHL2/ID1, CHL2/ID2, CHL2/ID3 Each corresponding disk of each part are mirrored together, so in this example, CHL0/ID10 and CHL2/ID1 are mirrored, CHL0/ID11 and CHL2/ID2 are mirrored, and CHL0/ID12 and CHL2/ID3 are mirrored. Product Sun StorageTek 3310 SCSI Array mirror, 3310, layout Previously Published As 71182 Change History Date: 2005-02-14 User Name: 7058 Action: Approved Comment: OK to republish. Updated review date. Version: 3 Date: 2005-02-14 User Name: 7058 Action: Accept Comment: Version: 0 Attachments This solution has no attachment |
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