[linux-lvm] raidtools/mdadm stability

[linux-lvm] raidtools/mdadm stability

[Don Shesnicky]

 

Couple of quick questions on raidtools/mdadm if anyone cares to comment:

1. In the raid faq it states "However, if you find raidtools cumbersome 
or limited, mdadm (multiple devices admin) is an extremely useful tool 
for running RAID systems. It can be used as a replacement for the 
raidtools, or as a supplement." I want to mirror the root drives of a 
RHEL4 ES U2 system, what's the prefered method for stability -
raidtools, 
mdadm or mdadm with raidtools. 

2. I take it from a previous posting I can mirror my two root drives, 
installed the MBRs and be good to go to boot off either drive, that 
the mirror is not at the bit level and does not include the MBR?

3. Is RHEL4 ES Update2 generally stable or is there something that 
could burn us here?

Don

Re: [linux-lvm] raidtools/mdadm stability

[Andy Smith]

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On Thu, Feb 02, 2006 at 10:15:52AM -0600, Don Shesnicky wrote:
> Couple of quick questions on raidtools/mdadm if anyone cares to comment:
> 
> 1. In the raid faq it states "However, if you find raidtools cumbersome 
> or limited, mdadm (multiple devices admin) is an extremely useful tool 
> for running RAID systems. It can be used as a replacement for the 
> raidtools, or as a supplement." I want to mirror the root drives of a 
> RHEL4 ES U2 system, what's the prefered method for stability -
> raidtools, 
> mdadm or mdadm with raidtools. 

raidtools is obsolete, so mdadm.

> 2. I take it from a previous posting I can mirror my two root drives, 
> installed the MBRs and be good to go to boot off either drive, that 
> the mirror is not at the bit level and does not include the MBR?

The mirror is at the block device level, e.g. if your root fs is
/dev/sda1 then that's what you mirror.  So you could install an MBR
on sda and sdb for example.

> 3. Is RHEL4 ES Update2 generally stable or is there something that 
> could burn us here?

I have had no issues whatsoever with LVM or mdadm in RHEL3 or 4.
Apart from LVM snapshots, of course.

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