On Sat, Jun 7, 2008 at 9:08 AM, Mag Gam <email@example.com
> hey Jim
> thanks for the reply.
> My setup is very different from the OP. I was just intrigued by his LVM
> write up. I suppose I should start a new thread :-)
> I have 12disk (500GB) disk array. I would like to setup 2 (or 3 or 4) RAID
> 5 volumes via controller. Once I setup the volumes, I will create PVs out of
> them using LVM. The LVs create I plan on using striping and put ext3 fs. My
> question is, what would be the optimal setup for performance? Redudancy is
> important but would like to get good performace because we are planning to
> do scientific computing for the summer at my University...
> On Sat, Jun 7, 2008 at 8:53 AM, James Barrett <firstname.lastname@example.org
>> RAID on HW level - I am supposing you mean two RAID1 arrays? Striping
>> with LVM... as in, two physical devices, one VG, and striping...
>> This is feasible. I do not see how doing this would be any different
>> than RAID1+0 or RAID0+1, allowing you to lose two of four disks. It
>> just depends on which disks you lose! If you lose two disks in the
>> same array, all data is lost. If you lose one disk in each array, you
>> still have all data. Of course, I imagine that using LVM for the
>> striping allows you to add non-raided disks, which completely defeats
>> the purpose of using any raided disks.
>> If you choose RAID6 (2 parity), it will give different results. You
>> still have the ability to lose 2 disks, but without discretion on
>> which are lost. The downside of RAID6 is decreased performance.
>> On Sat, Jun 7, 2008 at 8:30 AM, Mag Gam <email@example.com
>> > Slightly off topic question ...
>> > I see you are using RAID on LVM, what if I am using RAID on HW level and
>> > I
>> > plan to stripe on LVM level. Is this a good practice?
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