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LXF 150 LVM and performance

 
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thinker



Joined: Mon Mar 21, 2011 6:50 pm
Posts: 4

PostPosted: Mon Nov 07, 2011 9:41 am    Post subject: LXF 150 LVM and performance Reply with quote

In "LXF150 - LVM: Manage your storage" Jonathan states:
Quote:
It [LVM] does this by, in effect, standing between the filesystem and the physical disks, mediating all their interactions.


This sounds like the typical solution by introducing an extra level of indirection. I have no problem with that as it makes life easier in a number of ways.

However, that made me think about performance since disk I/O is one of the key resources (hence the multiple cache levels, SSD, etc).

Has the performance impact of LVM (compared to traditional partitioning schemes) been measured? Can anything be done to tune its performance? For example, what is the impact of changing the size of the extents from the default 32MB? Is there any point in trying to match this size to the size of the (hardware) disk cache. Conversely, should we buy disks that have a certain amount of cache?
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thinker



Joined: Mon Mar 21, 2011 6:50 pm
Posts: 4

PostPosted: Thu Nov 10, 2011 10:59 am    Post subject: Reply with quote

Since my original post, I have found the following two pages where increased performance was reported by two individuals:

http://users.tkk.fi/sliedes/fsspeed/fsspeed.html
http://blog.andrew.net.au/2006/08/09
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