look this: http://www.ramsan.com/products/4 http://www.ramsan.com/products/2 2011/1/19 Roberto Spadim <roberto@xxxxxxxxxxxxx>: > don´t forget that you can use ramdisks.... just read how to select the > right memory, and the right position before initialize you ramdisk > > 2011/1/19 Roberto Spadim <roberto@xxxxxxxxxxxxx>: >> ok, your hardware have: >> cpu, memory, disk controller, disks >> >> and you computer have: >> cpu, memory, disk controler (your hardware) >> >> if your computer cache don´t sync to your disk controller you will >> lose information.... >> >> check that *memory, is the volatille memory and *disk controller is >> the non volatille memory >> if you tell me that you will never have a *memory, and you have always >> a non volatille memory, no problem, you will never need a kernel >> load... just a boot loader that read previous memory information and >> start in that point... why don´t do this? non volatille memory is not >> as fast as volatille memory >> got the problem? >> >> >> 2011/1/19 Cory Coager <ccoager@xxxxxxxxx>: >>> On Wed, Jan 19, 2011 at 01:19:18PM -0200, Roberto Spadim wrote: >>>> ok, >>>> but if you don?t sync file system (remove from memory and put in disk >>>> controller) >>>> you will lost information with or without a batery >>>> >>>> how to don?t lose information? >>>> don?t power down you memory,cpu, disk controller (sata controler, raid >>>> controller, or anyother) and disks (does it have a batery? a super >>>> capacitor?) >>>> if you power down, be sure that all memory was send to disk controller >>>> and that disk controller have energy (batery or capacitor) to send >>>> information to disks (they need batery or capacitor too) >>>> >>>> right? >>>> so, a ups can power cpu, memory, disk controller and disks with only >>>> one batery (not a batery for each device cpu,memory,disk,disk >>>> controller) >>>> the best world could be a non volatile memory (250mb/s flash 4kb >>>> block) with the speed of volatile memory (10000mb/s ddr3 i don?t know >>>> the block size) >>> >>> It would have to work the same as a hardware RAID controller. >>> Information is first written to the cache then synced to the >>> disk. If the data is in the cache but not on the disk, the >>> machine loses power, next boot up the software raid would need a >>> way to flush the data from the ram disk to the disk. Of course >>> this would require the battery be in working condition, as with >>> any hardware. >>> >>> Hopefully I've explained that well enough. Perhaps it will be >>> better to see the hardware I'm talking about: >>> http://techreport.com/articles.x/16255 >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> >> >> >> -- >> Roberto Spadim >> Spadim Technology / SPAEmpresarial >> > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial > -- Roberto Spadim Spadim Technology / SPAEmpresarial -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
