QUESTION $1$ IA$$ Mnnl$.$c$1$

$($a$)$

rigure $Z$ : Iirrored NA$$D and striped KA U

Figure $2$ shows Mirrored RAID and Striped RAID. Discuss what happens in

Mirrored RAID and Striped RAID when Block $3$ in both Disk $1$ are corrupted.

$[4$ marks$]$

$($b$)$ An "interblock gap" is given to allocate time for the disk controller to transfer

data from the buffer to memory using Direct Memory Access $($DMA$).$ However,

sometimes the time provided by the intergap is insufficient to perform this task.

Recommend a solution to overcome this problem.

$[3$ marks$]$

$($c$)$ Physical File Storage consists of:

$($i$)$ contiguous

$($ii$)$ non$-$contiguous $($linked$)$

$($iii$)$ non$-$contiguous $($indexed$)$ formats.

Evaluate the performance of each type of memory allocations in the event of file

growth to the file management system.