Francois Caen wrote:
>>I then did a software RAIDO across them, and finally:
>>
>>mke2fs -b 4096 -j -m 0 -R stride=1024 -T largefile4 /dev/md0
>>
>>
>
>Joshua, thanks for the reply on this.
>There's something kludgy about having to do softraid across 2
>partitions before formatting. It adds a layer of complexity and
>reduces reliability. Is that the trick RH recommended to go up to 8TB?
>
>
>
Huh? I suspect he did this not because of the OS, but because each RAID
card had maxed out the number of physical ports. You don't HAVE to do
that. I suspect it would also work fine if you had a dozen 500gb
Hitachi drives on a 12-port 3ware card.
For what it's worth, I have also done RAID0 stripes of 2 raid arrays to
get *really* fast read/write performance when used for storing
uncompressed video. Recently, when I was at Apple for a meeting, that
was their engineer's preferred method for getting huge RAIDs....running
software RAID volumes across multiple Xserve-RAID devices
Perhaps I'm just extremely lucky, but I've not run into this magic 1TB
barrier that I see bandied about here. Heck, if you're willing to roll
the dice on Hitachi drives, you can get a terabyte these days with just
2 hard disks in the array with RAID0 or 3 disks with RAID5.
Unfortunately, a lot of the documentation and FAQs are quite out of date
which can lead to some confusion.
Cheers,
