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Old 12-14-2010, 11:37 PM   #1
shipon_97
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Registered: Oct 2005
Location: Bangladesh
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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 .. ...
 
Old 12-15-2010, 12:47 AM   #2
vikas027
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Registered: May 2007
Location: Sydney
Distribution: RHEL, CentOS, Debian, OS X
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Quote:
Originally Posted by shipon_97 View Post
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 View Post
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 View Post
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 View Post
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 View Post
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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