On Thu, Oct 27, 2005 at 01:41:28PM +0900, David Bennett wrote: > I have seen the same article about reducing the size on LVM... I guess > I'm just unclear about what I would lose if I lost an LVM'd drive > (stemming from the fact i dont know how LVM data is stored.) Are bits > of one file stored across multiple drives, or would the loss of a > drive result in the loss of complete files?
It depends. When you build an LVM you have a choice between linear or striped layout. Linear allocates data sequentially from the beginning of the first drive through the end of the last drive. Striping writes the data in chunks, rotating between drives in sequence. Striping generally improves performance, but striped sets can't be extended whereas linear sets can grow. In the event of disaster it's probably easier to recover data from the bits and pieces of a linear set, although it wouldn't be easy. LVM and software RAID both use block devices and present themselves as block devices, so it's possible to layer them to achieve almost any desired level of flexibility and reliability. -- A: Because it messes up the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail?
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