On Sat, 1 Dec 2001, Morten Holm wrote:
> Hi,
>
> People on this list keep saying that ataraid should not be used for production and that one can achieve better performance using software raid instead of ataraid.
>
> Why is that?
>
ATA-raid is software raid also, but it is developed to be windows
compatible. Windows and linux in same machine is only reason to select
ata-raid. (future maybe more reasons?)
Linux have atleast three software raid systems:
(ataraid is only device driver for promise and htp...)
1. old software raid (md style)
- only raid0 and raid1.
- old 2.2-kernels
- don't use (without good reason, like am930 wlan, as I do)
2. new linux raid dev
- very good,
- autodetec in boot,
- disk signatures, raid works if disks is swapped in ide/scsi bus.
- raid5, raid1, raid0 and combinations.
- hotspares, hot reconstruction, hotswap (depends hardware)
- select this or
3. Linux LVM
- This is lot more than raid...
- only raid0 and raid1 (maybe old data)
- No more too small partition problem
- Lot of features -> litle complicated...
- winners choice... (but not in every place...)
- If need raid5, lvm can mixed with 2.
- Still in development... select lvm 1.1
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