MSI NF750-G55 User Guide - Page 103

MS-7578, You can press, arrays created., There must be at least two fault tolerant arrays already

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MS-7578 You can press F1 to access the online help that walks you through the Wizard with step-by-step instructions. Designate a Spare Disk About Spare Disks You can designate a hard drive to be used as a spare drive for a RAID 1, RAID 0+1 or RAID 5 array. The spare drive can take over for a failed disk. MediaShield RAID supports two types of spare drives: Free Disk A free disk is a disk that is not part of any RAID array, but can be used by any available RAID 1, RAID 0+1, or RAID 5 array that requires another disk when one of its disks crashes or becomes unusable. The process is automatic and requires no user interaction. Example: A system may have four hard disks where one disk is used to boot the OS, two hard drives are set up in a mirrored array, and a fourth hard disk is set up as a free disk. If one of the mirrored array drives fails, the free disk will be assigned automatically to the mirrored array to replace the failed disk. Dedicated Disk A dedicated free disk is a disk that is assigned to a RAID 1, RAID 0+1, or RAID 5 array. The dedicated disk is used by that array only when needed ‐ for example, during a system crash where a RAID mirrored drive is broken. The dedicated disk can be used only by the array that it is assigned to and not by any other array, unlike a free disk which can be used by any available RAID 1, RAID 0+1, or RAID 5 array. To mark a disk as dedicated (reserve it for use by a specific array), you must have at least one free disk and you must also have at least two RAID 1, RAID 0+1, or RAID 5 arrays created. Requirements for Designating a Spare Disk The Designate Spare option on the Storage page appears only if all the following conditions are met. ■ There must be at least two fault tolerant arrays already created. ■ There must be at least one free disk with capacity equal to or greater than the smallest disk in the given fault tolerant array. For example, if a mirror array is created with disk capacities of 40 GB and 80 GB, there should be at least one free disk available of capacity equal to or greater than 40GB to be used as a spare disk for that array. Instructions Click Designate spare to start the Designate Spare Wizard and then follow instructions. You can press F1 to access the online help that walks you through the Wizard with step-by-step instructions. B-13

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B-13
MS-7578
You can press
F1 to access the onl±ne help that walks you through the W±zard w±th
step-by-step ±nstruct±ons.
Des±gnate a Spare D±sk
About Spare D±sks
You can des±gnate a hard dr±ve to be used as a spare dr±ve for a RAID 1, RAID 0+1 or
RAID 5 array. The spare dr±ve can take over for a fa±led d±sk. Med±aSh±eld RAID
supports two types of spare dr±ves:
Free D±sk
A free d±sk ±s a d±sk that ±s not part of any RAID array, but can be used by any ava±l-
able RAID 1, RAID 0+1, or RAID 5 array that requ±res another d±sk when one of ±ts
d±sks crashes or becomes unusable. The process ±s automat±c and requ±res no user
±nteract±on.
Example: A system may have four hard d±sks where one d±sk ±s used to boot the
OS, two hard dr±ves are set up ±n a m±rrored array, and a fourth hard d±sk ±s set up
as a free d±sk. If one of the m±rrored array dr±ves fa±ls, the free d±sk w±ll be ass±gned
automat±cally to the m±rrored array to replace the fa±led d±sk.
Ded±cated D±sk
A ded±cated free d±sk ±s a d±sk that ±s ass±gned to a RAID 1, RAID 0+1, or RAID 5 ar-
ray. The ded±cated d±sk ±s used by that array only when needed ‐ for example, dur±ng
a system crash where a RAID m±rrored dr±ve ±s broken. The ded±cated d±sk can be
used only by the array that ±t ±s ass±gned to and not by any other array, unl±ke a free
d±sk wh±ch can be used by any ava±lable RAID 1, RAID 0+1, or RAID 5 array.
To mark a d±sk as ded±cated (reserve ±t for use by a spec±fic array), you must have at
least one free d±sk and you must also have at least two RAID 1, RAID 0+1, or RAID
5 arrays created.
Requ±rements for Des±gnat±ng a Spare D±sk
The Des±gnate Spare opt±on on the Storage page appears only ±f all the follow±ng
cond±t±ons are met.
There must be at least two fault tolerant arrays already created.
There must be at least one free d±sk w±th capac±ty equal to or greater than the smallest
d±sk ±n the g±ven fault tolerant array.
For example, ±f a m±rror array ±s created w±th d±sk capac±t±es of 40 GB and 80 GB,
there should be at least one free d±sk ava±lable of capac±ty equal to or greater than
40GB to be used as a spare d±sk for that array.
Instruct±ons
Cl±ck Des±gnate spare to start the Des±gnate Spare W±zard and then follow ±nstruc-
t±ons.
You can press
F1 to access the onl±ne help that walks you through the W±zard w±th
step-by-step ±nstruct±ons.
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