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Re: [K12OSN] /var is full!

In theory, yes, contiguous space for a partition is best. OTOH, depending on the situation, the performance improvement may only be marginal. And your solution of putting different partitions/mount points onto different disks is the way we used to do it years back when disks were a lot slower because it could yield siginificant benefits. However, any more, where we need top performance, we go to RAID systems, with large caches, 15k rpm disks, etc. But not everyone has that kind of money (I don't at home), in which case, multiple disks is one way to improve that. In the poor man's lab that is my basement, I haven't benchmarked multiple 5400rpm drives versus a 7200rpm lvm'd disk with partitions spread over multiple lvs, but it might produce interesting results. I just haven't noticed any performance hit from using lvm on RedHat, but I'm also not running a system with a lot of users. For a single user system like a desktop, I doubt you'd see a significant difference. To answer your question, no, I haven't seen any tools for optimizing the seek activity. LVM was developed by Sistina, who might sell tools for such management, though.


Les Mikesell wrote:
On Thu, 2003-10-23 at 08:30, Petre Scheie wrote:

Rather, it would put 4GB into various system partitions, plus, say, 4GB for /home, and leave the rest unallocated, but which can be added to existing lvs as necessary or used to create new lvs.

Doesn't that give you really horrible performance when you grow a
partition into space that is far away from the previous part? Multiuser machines tend to have the drive head motion as a bottleneck
anyway since everyone wants the head to be in a different place
at the same time. I like to have root/swap on one drive, /var
on another and /home on another (software mirroring each to identical
drives if possible). That way the continuous scribbling in /var/log
and /var/spool doesn't interfere with loading programs or saving data.
Does LVM have any way to optimize the seek activity or do you lose
control completely?

   Les Mikesell
    les futuresource com

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