|
I found this description about disk setup in install guide: It is not necessary to set up RAID on disks used by MapR-FS. MapR uses a script called disksetup to set up storage pools. In most cases, you should let MapR calculate storage pools using the default stripe width of two or three disks. If you anticipate a high volume of random-access I/O, you can use the -W option with disksetup to specify larger storage pools of up to 8 disks each. question is : 1)for disk, pls define default stripe width of two or three disks. Is it RAID 0? 2)Why use –W and why unto 8 disk, pls explain in detail? |
|
Yes, its RAID0 . Your data is scattered for better performance. The more disks the better performance, hence the suggestion for higher I/O situations. But if any one disk fails on the storage pool, the whole pool goes offline. So its a trade-off between the probability for a failure and the performance gain from scattering data. |
