Thanks for the responses all. I want RAID 5 but without mirroring. The data is important but not that important. I am planning to use LVM.
If the controller creates a stripe size of 16k, do I need to do anything special with physical extends (in pvcreate or vgcreate) ? Do I need to do anything specific when creating a LV? I plan on striping my LV to create extra spindles. Do I need to create my ext3 filesystem with any particular settings? I am looking for a optimal tuning guide with emphasis on performace versus redudancy. On Sat, Jun 7, 2008 at 4:27 PM, Andrew M.A. Cater < [EMAIL PROTECTED]> wrote: > On Sat, Jun 07, 2008 at 12:52:24PM -0400, Mag Gam wrote: > > With the RAID array I am planning to use RAID 5 so my data is still > > protected. My confusion is going with RAID striping (picking the right > > size). Also, Does the filesystem layout need to be specific when I do > > striping? If I am using 128k stripes, should I start my filesystem on > 129k > > and end with max-(128+1k)? > > > > You have four or five considerations. > > You mentioned you were going to use your 12 disks as two RAID arrays. > > If one is going to be for your data and one for a backup of that data - > 2 x RAID 5 and then RAID1 [5 x 500 = ~2.5TB mirrored]. > > If you need maximum data storage - all your disks in one array in RAID > 5. > > 11 x 500, one spare - 5.5TB but you rely on the spare :) > > If you need data resilience - all your disks in one array in RAID 6 or > RAID 10 > > Hardware RAID control is lovely - but you may need battery backup on > some cards to avoid problems on delayed writes. Hardware RAID control > also ties you to one manufacturer's cards and/or recovery utilities if a > RAID fails and you have to recover data. > > If you go the hardware route: take the card defaults. > > Linux mdadm works well and, under some circumstances, can approach the > performance of a dedicated hardware RAID card - disks can be swapped > into any Linux box to recover the RAID. > > You can then add LVM on top. > > HTH, > > Andy > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact > [EMAIL PROTECTED] > >
