[nflug] RE: Partitions sizes

Sun Nov 27 12:56:41 EST 2005

Hi, Dave
  Sounds like a really nice setup your planning! 

  "Beware though that if the 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 data-loss as it'll only take one out of the group of drives to fail to cause potential data loss". 

  Yea, this would be a weakness in the system, so one would have to be very careful. As you said you do have a second channel available, could you set up a dual setup, and mirror the raid might solve the problem? Or would it be easier to mirror to another system over the network. Like running dual servers, ie: main and backup, but If this is a home based system then it is all inane.

The box I have to work with will allow me to run a ATA 133 to serial drive raid system, MSI board you see. For now I was only planning to leave in the 120gig, but add a DVD -/+ RW Duel layer, and two to three more 120gig or larger drives. Or as you state more then two HDD do slow performance, so I just could leave in the CD-RW. 

  I did a bit of figuring with pen and paper to plan out how to allocate drive space to each partition, and I ended up with this layout.

   /boot 100megs, / 10gigs, /usr 25gigs, /usr/local 25gigs, /var 10gigs, /home 20gigs, /tmp 10gigs, /opt 10gigs, and /scratch 10gigs. How does that sound for starters?

  You where talking about SCSI, so that subject I was thinking of how to get my IBM Intellistation up and running. I'm looking into SCSI for it, but really don't know where to start. I would need a card, have a 68pin cable to work with and have room for three drives. I would like to go with 50 to 150gig drives if possible, any suggestion? I was planning on using the CD-RW on IDE channel 2 as master. 
  Say any idea if that SCSI to IDE bridge would work with IDE optical drives, rather than connecting it through the IDE controller.

  Thanks, Ron Maggio

Dave Andruczyk <djandruczyk at yahoo.com> wrote:

--- Ron Maggio 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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