On Sat, 2005-07-09 at 23:40 +0200, Farkas Levente wrote: > what happends if the 3ware card get wrong? > do you always have a backup raid controller The issue is no different than with tape cartridges. Yes. I _always_ deploy at least (2) 3Ware cards at any organization, so there is a fall-back in the case of disaster. > (with the same type)? There is no such thing as "same type" with 3Ware. As long as you put the volume in a device that is the same or newer firmware, you're fine. BTW, I have deployed over 50 (five-zero) 3Ware cards and have _never_ had a failure of a device yet. Some are 4+ years old and still in use. Plus I personally have an original 3Ware Escalade 7800 8-channel at home I have upgraded from Red Hat Linux 6.1 to Fedora Core 3 -- *0* non-sense with LVM/MD. > with software raid you can plug it to any kind of controller > and save your data! That's what backup is for! Geez. ;-> And not always, if they disagree over low-level format. I've had that happen with different SCSI host adapters from different vendors on more than one occasion (and even the same vendor -- OEM v. Retail Adaptec). And when it comes to RAID-1, it's just a full disk mirror anyway. > at the first place we start to use 3ware's raid5 when it's crashes at > the first week and we got a mail from 3ware that it's a known issue with > the current firmware. that was enough! That was the 3Ware Escalade 6000 series. 3Ware added RAID-5 support for the 6000 series when customers requested it. 3Ware regretted ever doing such. _Never_ seen an issue on the Escalade 7000+ series. On the 6000 series, I always use just RAID-1 or RAID-10. In many cases, RAID-5 (regardless of implementation) is _not_ fast enough, so I use RAID-10. > how you can plug 1.5TB into machine? and the only good kernel support is > for 3ware (at least 2-3 years ago). that simple. Hmmm, I thought RAIDCore's solution was integrated with LVM/MD? And they _do_ have hot-plug last time I checked. Just seems like a massive waste of the ASIC. -- Bryan J. Smith b.j.smith at ieee.org --------------------------------------------------------------------- It is mathematically impossible for someone who makes more than you to be anything but richer than you. Any tax rate that penalizes them will also penalize you similarly (to those below you, and then below them). Linear algebra, let alone differential calculus or even ele- mentary concepts of limits, is mutually exclusive with US journalism. So forget even attempting to explain how tax cuts work. ;->