LVM - Combining different hard drives with different specs ?
Hi,
I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive I want to add. I am using Ubuntu Server 10.04, I installed the existing 100GB drive using LVM, only a single initial HD. I aim to increase my storage capacity under the server's document root /var/www... Before I get started hopefully asking intelligent questions and giving the needed information to help you help me, I wanted to ask this initial question:
These two drives are different, they surely have different performance. Will this be a problem? If it was RAID I think matching drives are needed. I just want to add storage capacity with acceptable performance for a local in-house server.
Thanks,
Lee G.
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Not a problem. If the drives have different performance, some files may have different performance, but that's actually nothing new because the outside of a disk platter is faster than the inner tracks. So whether you have one disk, two matched disks, or two mismatched disks you'll always have different areas with different performance.
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Quoted 22 lines · Lee Gold
Hi,
I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive I want to add. I am using Ubuntu Server 10.04, I installed the existing 100GB drive using LVM, only a single initial HD. I aim to increase my storage capacity under the server's document root
/var/www... Before I get started hopefully asking intelligent questions and giving the needed information to help you help me, I wanted to ask this initial question:These two drives are different, they surely have different performance. Will this be a problem? If it was RAID I think matching drives are needed. I just want to add storage capacity with acceptable performance for a local in-house server.
Thanks,
Lee G.
Quoted 11 lines · Lee Gold
I have a 100GB IDE HD that will fill up soon. I have a 1TB SATA drive I want to add. I am using Ubuntu Server 10.04, I installed the existing 100GB drive using LVM, only a single initial HD. I aim to increase my storage capacity under the server's document root
/var/www... Before I get started hopefully asking intelligent questions and giving the needed information to help you help me, I wanted to ask this initial question:These two drives are different, they surely have different performance. Will this be a problem? If it was RAID I think matching drives are needed. I just want to add storage capacity with acceptable performance for a local in-house server.
Even for RAID, they don't have to match. For RAID1, write speed will follow the slowest drive.
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Quoted 2 lines · Stuart D. Gathman
Even for RAID, they don't have to match. For RAID1, write speed will follow the slowest drive.
Though combining lower and higher speed drives can increase the wear rate on the larger drive (that is atleast what we found when a 10k and 15k had to be used in a mirror (due to spare drive availablity).
James