At 10:13 pm +0100 24/1/01, Aley Keprt wrote: >> At 9:06 pm +0100 24/1/01, Aley Keprt wrote: >> >If you use two disks without RAID0, you have the same data loss >probability. >> >> Wrong. With RAID0, you lose the integrity of your *entire* filesystem when >> _either_ of the disks crash. So you expect to potentially lose 100% of >your >> data every (MTBF/2) years. > >Of course. But this is software problem "How many data you lose when your >disk crashes." >We talked about hardware problems.
A disk crash *is* a hardware problem! If/When a drive fails, you've almost certainly lost all data on that unit. The key is that with a RAID0 filesystem, one crash of any unit makes the data on all the *other* units useless. Yes, the choice of filesystem makes it a software issue, but *you* started talking about data loss probability and saying it was independent of RAID0. That probability *is* increased with RAID0 as compared to two independent filesystems. I think the reasons have been explained clearly enough already. Andrew -- --- Andrew Collier ---- ---- http://mnemotech.ucam.org/ --- -- r<2+ T<4* cSEL dMS hEn/CB<BL A4 S+*<++ C$++L/mP W- a-- Vh+seT+ (Cantab) 1.1.4
