#Diskkeeper 2.0 static problem software
S a hardware or software component that stores data so future requests for that data can be served faster the data stored in a cache might be the result of an earlier computation, or the duplicate of data stored elsewhere. However, some synthetic benchmarks also show a drop in performance for the same comparison. Synthetic benchmarks show varying levels of performance improvements when multiple HDDs or SSDs are used in a RAID 1 setup, compared with single-drive performance. However, if disks with different speeds are used in a RAID 1 array, overall write performance is equal to the speed of the slowest disk. The array will continue to operate so long as at least one member drive is operational.Īny read request can be serviced and handled by any drive in the array thus, depending on the nature of I/O load, random read performance of a RAID 1 array may equal up to the sum of each member's performance, while the write performance remains at the level of a single disk. This layout is useful when read performance or reliability is more important than write performance or the resulting data storage capacity. This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks a classic RAID 1 mirrored pair contains two disks.
However, some RAID implementations allow the remaining 200 GB to be used for other purposes. For example, if a 120 GB disk is striped together with a 320 GB disk, the size of the array will be 120 GB × 2 = 240 GB. RAID 0 is normally used to increase performance, although it can also be used as a way to create a large logical volume out of two or more physical disks.Ī RAID 0 setup can be created with disks of differing sizes, but the storage space added to the array by each disk is limited to the size of the smallest disk. This configuration is typically implemented having speed as the intended goal.
Since RAID 0 provides no fault tolerance or redundancy, the failure of one drive will cause the entire array to fail as a result of having data striped across all disks, the failure will result in total data loss. RAID 0 (also known as a stripe set or striped volume) splits ("stripes") data evenly across two or more disks, without parity information, redundancy, or fault tolerance.
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