HP StorageWorks 2000i HP StorageWorks 2000 G2 Modular Smart Array reference gu - Page 24
RAID level, Expansion capability, Maximum disks, level, disks, Description, Strengths, Weaknesses
View all HP StorageWorks 2000i manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 24 highlights
Table 5 RAID level comparison (continued) RAID level 5 6 10 (1+0) 50 (5+0) Min. Description disks 3 Block-level data striping with distributed parity 4 Block-level data striping with double distributed parity 4 Stripes data across multiple RAID-1 sub-vdisks 6 Stripes data across multiple RAID-5 sub-vdisks Strengths Weaknesses Best cost/performance for transaction-oriented networks; very high performance and data protection; supports multiple simultaneous reads and writes; can also be optimized for large, sequential requests Write performance is slower than RAID 0 or RAID 1 Best suited for large sequential workloads; non-sequential read and sequential read/write performance is comparable to RAID 5 Higher redundancy cost than RAID 5 because the parity overhead is twice that of RAID 5; not well-suited for transaction-oriented network applications; non-sequential write performance is slower than RAID 5 Highest performance and data protection (can tolerate multiple disk failures) High redundancy cost overhead: because all data is duplicated, twice the storage capacity is required; requires minimum of four disks Better random read and write performance and data protection than RAID 5; supports more disks than RAID 5 Lower storage capacity than RAID 5 Table 6 Vdisk expansion by RAID level RAID level Expansion capability Maximum disks NRAID Cannot expand. 1 0, 3, 5, 6 You can add 1-4 disks at a time. 16 1 Cannot expand. 2 10 You can add 2 or 4 disks at a time. 16 50 You can add one sub-vdisk at a time. The added sub-vdisk must contain the same 32 number of disks as each of the existing sub-vdisks. 24 Getting started