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shipon_97 12-14-2010 10:37 PM
Wanna configure RAID1 in RHEL 5 !
 
Friends ,
I wanna configure RAID 1 within TWO HDD in RHEL-5 during installation moment .

I have the following questions regarding software raid vs hardware raid :

1) What is the basic difference between hardware and software raid

2) In software raid , If I use two HDD as RAID1 , then if one HDD is failed , can I boot it from another HDD ?

3)In software RAID , Between two HDD , If One HDD is failed then if I remove bad HDD and add a spare HDD then is it automatically synchronized with FIRST HDD ?

4) In software raid is it possible to keep '/boot' partition in two HDD (I use 2 HDD as RAID1) as separate partition ?

5) Finally is there any documnets or sites where I get software raid configuration during INSTALLATION moment in using GRAPHICAL mode , plz give me the address.


Ths in advance .. ...

vikas027 12-14-2010 11:47 PM
Quote:
Originally Posted by shipon_97 (Post 4191843)
Friends ,
I wanna configure RAID 1 within TWO HDD in RHEL-5 during installation moment .

I have the following questions regarding software raid vs hardware raid :

1) What is the basic difference between hardware and software raid
Hardware RAID
A hardware RAID implementation usually takes the form of a specialized disk controller card. The card performs all RAID-related functions and directly controls the individual drives in the arrays attached directly to it. With the proper driver, the arrays managed by a hardware RAID card appear to the host operating system just as if they were regular disk drives.
Most RAID controller cards work with SCSI drives, although there are some IDE-based RAID controllers as well.

Software RAID
Software RAID is simply RAID implemented as kernel- or driver-level software for a particular operating system. As such, it provides more flexibility in terms of hardware support — as long as the hardware is supported by the operating system, RAID arrays can be configured and deployed


Quote:
Originally Posted by shipon_97 (Post 4191843)
2) In software raid , If I use two HDD as RAID1 , then if one HDD is failed , can I boot it from another HDD ?
INMHO, this is not desired. RAID 1 is for mirroring disks. If in case you want to clone a disk, I recommend use of dd commands as :-
Code:
dd if=/dev/sda of=/dev/sdb
In this case /dev/sdb will become a clone of /dev/sda.


Quote:
Originally Posted by shipon_97 (Post 4191843)
3)In software RAID , Between two HDD , If One HDD is failed then if I remove bad HDD and add a spare HDD then is it automatically synchronized with FIRST HDD ?
Yes, this is possible.



Quote:
Originally Posted by shipon_97 (Post 4191843)
4) In software raid is it possible to keep '/boot' partition in two HDD (I use 2 HDD as RAID1) as separate partition ?
Yes, we can configure RAID1 for /boot.



Quote:
Originally Posted by shipon_97 (Post 4191843)
5) Finally is there any documnets or sites where I get software raid configuration during INSTALLATION moment in using GRAPHICAL mode , plz give me the address.
I can help you in software RAID through the command line part after installation. It is not too difficult.

I never tried any graphical tool, nor at the time of installation.


Hope this helps.


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