arkhan_jg
Apprentice
Joined: 18 Mar 2003
Posts: 199
Location: Dorset, UK
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 Posted: Tue Dec 30, 2003 4:28 am Post subject: |
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If you want to mount one directory over two drives, there are two ways of going about it.
The first is to setup some sort of virtual partition. I.E. EVMS, or LVM.
Basically, these will allow you to use your two drives together to create one partition the size of multiple ones added together. The downside is, if one drive fails, you risk losing the entire partition, so make sure you have good backups! The advantage of a virtual filesystem is you can add, resize or move the volume set between different physical drives very easily, thus allowing you to 'grow' the file system later. You can also create virtual filesystems that don't span the entire size of a physical disk.
The second option is to setup a software raid array. Depending on how you configure it, you will have:
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RAID 0: 2 or more hard drives are combined into one big volume. The final volume size is the sum of all the drives. When data is written to the RAID drive, the data is written to all drives in the RAID 0. This means that drive reads and writes are very fast, but if 1 drive dies you lose all your data.
RAID 1: 2 hard drives are combined into one volume the size as the smallest of the physical drives making it. The two hard drives in the RAID are always mirrors of each other. Thus, if a drive dies you still have all your data and your system operates as normal.
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Note, RAID is applied at the drive level, so you can't have different partitions across the drives; they must be used for the raid-array as a whole.
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