[nflug] RE: Partitions sizes

Dave Andruczyk djandruczyk at yahoo.com
Sun Nov 27 11:12:12 EST 2005



--- Ron Maggio <ronmaggio2005 at yahoo.com> wrote:

> Hi, Dave
>   Thanks for all your advice.
>    
>   So your going to add HDD's later on down the road, and from what your
> saying is that LVM will let you add them on and divide them up on the fly. So
> by doing so you can add partitions, and from what I've read about using LVM
> one can move (resizing partitions) them around without destroying data. So if
> I'm correct one can do partition extensions, similar to NT's volume striping
> to increase partition space? Linux has come a long way!
>    

Yes, what I'm planning on is picking up at least one Samsung Spinpoint P series
250GB drive (about $100.00 from newegg.com) and a SCSI to IDE bridge to allow
me to run it on my U160 SCSI bus (I don't care for IDE interfaces as if you run
more than one drive per channel performance goes to hell)  Since I still have
about 12 ID's free on the SCSI bus I could add a couple more before being BW
limited on the SCSI bus,  as this drive can't push more than about
35-40MB/second. theoretically I could have 4 of these on the SCSI bus running
in a RAID5 configuration and just nearly saturate that SCSI channel. (though I
have a second channel available)  whereas I'd need four independant IDE
channels to do the same thing, and I wouldn't have the advantages of command
queuing that SCSI gives me (the SCSI/IDE bridge does TCQ, Tagged command
Queuing)

Once this drive is in, it'll have a static /boot partition and the rest will be
LVM'd and split up as needed. if I add another drive, I can just LVM extend the
volume group to encompase both drives and now more space is available to extent
ANY partition on the LVM group.  the LVM core takes care of whereto put the
data.   Beware though that if hte drives are not in a redundant configuration.
(i.e. hardware raid 1/5) that adding drives together in a linear fashion will
increase the likelihood of dataloss as it'll only take one out of the group of
drives to fail to cause potential data loss..


Dave J. Andruczyk


		
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