Implementing Mass Storage. Flashcards
What feature can only be installed with the OS on a storage device?
Swap File Creation (Ram on disk)
Before a storage device can have an OS installed what is done?
Format and partition.
What is RAID?
Redundant Array of Inexpensive Disks.
Storage set up which can increase speed and/or allow data redundency.
What is RAID0? How many drives are required? Pros and cons?
Raid0 Stripping.
Requires 2 drive.
Files are split between drives
Increases speed but does not give redundency.
What is RAID1? How many drives are required? Pros and cons?
Raid1 Mirroring.
Requires 2 or 4 drives.
Files are copied identically on to 2 or 4 drives.
Gives redundency but is slower.
What is RAID5? How many drives are required? Pros and cons?
Raid5 Stripping with Parity.
Requires minimum of 3 Drives.
Data of a file is split between all but 1 drive and a Parity combination is saved the final. Data sets are rotated so each drive gets data and parities of different files.
Allows one drive to become corrupt as data can be rebuilt using the parity, more than one drive is a total loss. Increased speed.
What is RAID6? How many drives are required? Pros and cons?
Raid6 Stripping with DOUBLE Parity.
Requires minimum of 4 Drives.
Data of a file is split between all but 2 drives and an indetical parity is saved the final 2 drives. Data sets are rotated so each drive gets data and parities of different files.
Allows two drives to become corrupt as files can be rebuilt using the parity, more than two drives is a total loss. Same increase speed as RAID5 with additional redundancy of an additional drive.
What is RAID10? How many drives are required? Pros and cons?
Raid10 AKA Raid1+0 Striping Mirrors
Requires minimum of 4 Drives.
Drives are in pairs, each pair is a mirror itself, stripping the mirrors across pairs of drives.
Stripe of mirrors.
Allows one of each mirror to fail, on each pair of stripes, loosing one complete mirror is a total fail.
What is RAID0+1? How many drives are required? Pros and cons?
Raid0+1 Mirror stripes
Requires minimum of 4 Drives.
Drives are in pairs, each pair is a stripe that is mirrored onto the other pair.
Allows a complete stripe pair to fail, but losing one of each pair can result in a loss.
Where is it possible for RAID be set up or controlled?
Hardware, BIOS, software, OS.
Where can Hardware RAID be found physcially?
Expansion cards and on-board of motherboards.
Define Hot spare?
(RAID)
A hot spare is an unused drive in an array that is ready to take the place of a drive that fails.
Define Hot swappable?
(RAID)
Hot swappable is a setting in which a drive can be pulled or inserted without having to power down a system.
Expansion RAID controllers are configured where?
Their own BIOS and system setups.
Hardware RAID Arrays are viewed as what to the OS?
A single drive.
