On Mon, Sep 28, 2015 at 10:52 AM, jdd
Le 28/09/2015 16:36, Xen a écrit :
And explain why it is relevant. Even mainstream NAS devices with even dozens of disks (I believe) use software RAID.
As far as I understand, any raid is software driven (any computer hardware is software driven :-). All is to know where the software is run.
* Hardware raid is a box (nas) or a card (scsi) with on board software and processor(s) I don't have to care with. I had one, very handy! Usually pretty expensive and you have value for the money.
* fake raid are build in your own computer. Depending of the make, part of the software is in rom (possibly in the bios), part in the OS that may have to be windows (and what version?) to use the maker's driver. Linux may or may not see this, probably not.
* soft raid in linux is a very well implemented software, kernel module + user space commands. Of course it uses processor power, but who needs really all the time our processor power? I guess the penalty is little. But I have no idea of how windows manage this, probably not that well.
That said, I have no continuous availability necessity in my use, so I find raid a waste or data space and no more use it...
good discussion, anyway, but don't seems to show any new development about raid
thanks jdd
I went to the local Fry's over the weekend. They had a 2TB SSD from Samsung for about $900, or 1TB SSDs for $500. They both advertised 500 MB/sec read/write speed and over 100,000 IOPS. The "value" of a hardware raid controller may soon disappear in the 2TB or smaller market. ie. The last hardware raid controller I bought was $1,500 IIRC. fyi: The software overhead of a simple mirror is reasonably small. For $2K you can get 2 of those 2TB SSDs and setup an outrageously fast 2TB mirror. A couple years ago you would have had to spend significantly more to get the same performance/reliability. I'm fully aware hardware Raid5 / Raid6 will survive in the multi-TB market for some time to come. I'm talking exclusively about the 2TB or smaller market space. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org