Is there any performance lost in using a software raid array with only 1 disk?
I was wanting to use the mdadm monitoring tools to monitor the machines single disk drive for failures and such. Is there any performance hit for such a setup?
Some machines have RAID some machines dont (for me) and I was thinking about a common setup.
Also then if I want in the future I can actually just add the second disk and now I have RAID.
Jerry
On 31/01/07, Jerry Geis geisj@pagestation.com wrote:
Is there any performance lost in using a software raid array with only 1 disk?
IMHO a single disk in array should not make it faster or slower. However I would look at this thread with interest for answers from Guru's
Jerry Geis wrote:
Is there any performance lost in using a software raid array with only 1 disk?
I was wanting to use the mdadm monitoring tools to monitor the machines single disk drive for failures and such. Is there any performance hit for such a setup?
I assume you are talking about RAID1 arrays. No, you won't. Rather, you will get a performance loss if you carve up your disk into more than one partition.
Some machines have RAID some machines dont (for me) and I was thinking about a common setup.
Also then if I want in the future I can actually just add the second disk and now I have RAID.
I don't think you can actually build an array with missing disks.
Feizhou spake the following on 1/31/2007 7:09 AM:
Jerry Geis wrote:
Is there any performance lost in using a software raid array with only 1 disk?
I was wanting to use the mdadm monitoring tools to monitor the machines single disk drive for failures and such. Is there any performance hit for such a setup?
I assume you are talking about RAID1 arrays. No, you won't. Rather, you will get a performance loss if you carve up your disk into more than one partition.
Some machines have RAID some machines dont (for me) and I was thinking about a common setup.
Also then if I want in the future I can actually just add the second disk and now I have RAID.
I don't think you can actually build an array with missing disks.
Yes, you can build an array with missing disks, and you shouldn't see much write difference with a missing drive in raid1, but might see a lower read performance (lower than having the raid array, but near equal to a single non-raid drive). With software raid5, you usually see some degradation with both write and read.
On 31/01/07, Feizhou feizhou@graffiti.net wrote:
I don't think you can actually build an array with missing disks.
Yes. You can use mdadm with missing in create/assemble.
On Wed, 31 Jan 2007 09:41:42 -0500 Jerry Geis geisj@pagestation.com wrote:
Is there any performance lost in using a software raid array with only 1 disk?
I was wanting to use the mdadm monitoring tools to monitor the machines single disk drive for failures and such. Is there any performance hit for such a setup?
For monitor drive health I would think smartd would be a better choice.
Some machines have RAID some machines dont (for me) and I was thinking about a common setup.
Also then if I want in the future I can actually just add the second disk and now I have RAID.
This is not a bad idea if you plan on actually upgrading running machines non-RAID machines to RAID 1.
Jerry _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
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