| 1 |
On Thursday 20 April 2006 00:46 Neil Bothwick was like: |
| 2 |
> > Am I correct in understanding that I can use LVM2 to stripe a volume |
| 3 |
> > across more than one disk, just like a raid 0 setup, even if the disks |
| 4 |
> > are quite dissimilar? Would it be possible (or worthwhile) to allocate |
| 5 |
> > my old 40GB disk and a portion of my new disk (say another 40GB) to a |
| 6 |
> > single logical volume to be used as a fast audio and video |
| 7 |
> > scratchspace? (For Linux, that is -- I am aware that it wouldn't be |
| 8 |
> > accessible from Windows). I would keep the rest of disk in normal |
| 9 |
> > partitions to reduce the risk of losing all my data to disk failure. |
| 10 |
> |
| 11 |
> It is perfectly possible, but performance may suffer if one disk is |
| 12 |
> slower than the other, compared with using the fast disk alone. Another |
| 13 |
> option may be to use the old disk for the operating systems and the new |
| 14 |
> one for data. Speed of the OS disk only affects program loading time, |
| 15 |
> you would then get maximum performance when using the programs. |
| 16 |
|
| 17 |
Thanks for your help once again, Neil. |
| 18 |
|
| 19 |
The problem I am trying to solve is less about getting best all-round disk |
| 20 |
performance than it is to get super-duper disk performance when doing |
| 21 |
extremely disk intensive tasks such as video and audio editing. I'm not sure |
| 22 |
that having the OS or the swap on different disks because if I have enough |
| 23 |
memory I shouldn't need to access them very much while doing the audio and |
| 24 |
video stuff. |
| 25 |
|
| 26 |
The disks are probably not too dissimilar in terms of read and write speed |
| 27 |
(I'll need to look up the specs to verify this). However the cache sizes are |
| 28 |
quite different: 1MB as opposed to 8MB. Would the smaller cache make the |
| 29 |
older disk much slower in practice when it comes to writing or reading very |
| 30 |
large files -- slow enough to bog down the other one if a volume was striped |
| 31 |
across them? |
| 32 |
|
| 33 |
Robert |
| 34 |
|
| 35 |
-- |
| 36 |
Robert Persson |
| 37 |
|
| 38 |
Conspiracy Bears: |
| 39 |
Once upon a time there were lots of conspiracy bears... |
| 40 |
|
| 41 |
|
| 42 |
-- |
| 43 |
gentoo-user@g.o mailing list |
Archives