日期：2007-06-24 | 分类：基础知识 | 阅读：1,209 | 评论关闭 Tags: HBA, initiator, ISCSI, RAID, Target |
iSCSI Initiator 可用软件方式实现，同样的iSCSI Target 也行，不过优劣特点也相近，即是偏成本取向且不易达到专属硬件的效能。且要更注意的是，iSCSI Initiator 软件确实多半采随附的放送策略…… 软件法:如何实现一个iSCSI Target iSCSI Initiator 可用软件方式实现，同样的iSCSI Target 也行，不过优劣特点也相近...
日期：2007-06-19 | 分类：基础知识 | 阅读：1,813 | 评论关闭 Tags: 工作原理, 图解, RAID, RAID10 |
RAID 10: Very High Reliability combined with High Performance Characteristics/Advantages 1. RAID 10 is implemented as a striped array whose segments are RAID 1 arrays 2. RAID 10 has the same fault tolerance as RAID level 1 3. RAID 10 has the same overhead for fault-tolerance as mirroring alone 4. High I/O rates are achieved [...]
...日期：2007-06-19 | 分类：基础知识 | 阅读：1,641 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID7 |
RAID 7: Optimized Asynchrony for High I/O Rates as well as High Data Transfer Rates Architectural Features: 1. All I/O transfers are asynchronous, independently controlled and cached including host interface transfers 2. All reads and write are centrally cached via the high speed x-bus 3. Dedicated parity drive can be on any channel 4. Fully [...]
...日期：2007-06-19 | 分类：基础知识 | 阅读：1,798 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID6 |
RAID 6: Independent Data disks with two independent distributed parity schemes Characteristics/Advantages 1. RAID 6 is essentially an extension of RAID level 5 which allows for additional fault tolerance by using a second independent distributed parity scheme (two-dimensional parity) 2. Data is striped on a block level across a set of drives, just like in [...]
...日期：2007-06-19 | 分类：基础知识 | 阅读：3,259 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID5 |
RAID 5: Independent Data disks with distributed parity blocks Characteristics/Advantages 1. Highest Read data transaction rate 2. Medium Write data transaction rate 3. Low ratio of ECC (Parity) disks to data disks means high efficiency 4. Good aggregate transfer rate
...日期：2007-06-19 | 分类：基础知识 | 阅读：1,788 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID4 |
RAID 4: Independent Data disks with shared Parity disk Characteristics/Advantages 1. Very high Read data transaction rate 2. Low ratio of ECC (Parity) disks to data disks means high efficiency 3. High aggregate Read transfer rate Disadvantages 1. Quite complex controller design 2. Worst Write transaction rate and Write aggregate transfer rate 3. Difficult and [...]
...日期：2007-06-19 | 分类：基础知识 | 阅读：2,047 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID3 |
RAID 3: Parallel transfer with parity Characteristics/Advantages 1. Very high Read data transfer rate 2. Very high Write data transfer rate 3. Disk failure has an insignificant impact on throughput 4. Low ratio of ECC (Parity) disks to data disks means high efficiency
...日期：2007-06-19 | 分类：基础知识 | 阅读：1,468 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID2 |
RAID 2: Hamming Code ECC Characteristics/Advantages 1. “On the fly” data error correction 2. Extremely high data transfer rates possible 3. The higher the data transfer rate required, the better the ratio of data disks to ECC disks 4. Relatively simple controller design compared to RAID levels 3,4 & 5
...日期：2007-06-19 | 分类：基础知识 | 阅读：2,644 | 评论关闭 Tags: 工作原理, 图解, CACHE, IO, RAID, RAID1 |
RAID1: Mirroring and Duplexing Characteristics/Advantages 1. One Write or two Reads possible per mirrored pair 2. Twice the Read transaction rate of single disks, same Write transaction rate as single disks 3. 100% redundancy of data means no rebuild is necessary in case of a disk failure, just a copy to the replacement disk 4. [...]
...日期：2007-06-19 | 分类：基础知识 | 阅读：2,336 | 2 个点评 » Tags: 工作原理, 图解, CACHE, IO, RAID, RAID0 |
RAID 0: Striped Disk Array without Fault Tolerance Characteristics/Advantages 1. RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written to a separate disk drive 2. I/O performance is greatly improved by spreading the I/O load across many channels and drives 3. Best performance is achieved [...]
...
