best possible GJOURNAL device?
http://www.vikingmodular.com/products/arxcis/ddr3/ddr3.html or ZFS ZIL device for ZFS fans. anyone know exactly how it is visible and how it works? isn't BIOS clearing out memory on reboot? FreeBSD is but it can be patched easily. How to get DRAM controller mapping i mean what DIMM is at what address? ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: best possible GJOURNAL device?
On Thu, Apr 26, 2012 at 10:16 AM, Wojciech Puchar woj...@wojtek.tensor.gdynia.pl wrote: http://www.vikingmodular.com/products/arxcis/ddr3/ddr3.html or ZFS ZIL device for ZFS fans. anyone know exactly how it is visible and how it works? In general devices like these that I've dealt with in the past are presented as SATA or SAS devices, but some devices require additional drivers (take Ramdrives devices for instance). isn't BIOS clearing out memory on reboot? Depends on the BIOS, the settings set in the BIOS, etc. FreeBSD is but it can be patched easily. I wouldn't depend on volatile memory working in a non-volatile manner unless it's battery backed (which companies like Ramdrive, STEC, Viking, etc do) and in which case all you're doing (depending on how the device is designed) is delaying writes out to non-volatile (NAND/NOR flash) or another non-volatile medium (USB thumbdrive? etc... I vaguely remember seeing a vendor doing something clever like that...). How to get DRAM controller mapping i mean what DIMM is at what address? What is located where should be opaque if the designer designed it properly (otherwise a driver will need to be added to interface with the device if the vendor is trying to be clever or is not fully conforming to ATA/SCSI standards). Thanks, -Garrett ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: best possible GJOURNAL device?
http://www.vikingmodular.com/products/arxcis/ddr3/ddr3.html In general devices like these that I've dealt with in the past are presented as SATA or SAS devices, but some devices require additional drivers (take Ramdrives devices for instance). this one - as described - is 100% regular DDR3 DIMM and plugged as normal memory. Depends on the BIOS, the settings set in the BIOS, etc. FreeBSD is but it can be patched easily. I wouldn't depend on volatile memory working in a non-volatile manner unless it's battery backed (which companies like Ramdrive, STEC, this is supercapacitor backed. after poweroff it have enough time to write all to SLC flash chip. How to get DRAM controller mapping i mean what DIMM is at what address? What is located where should be opaque if the designer designed it properly (otherwise a driver will need to be added to interface with the device if the vendor is trying to be clever or is not fully conforming to ATA/SCSI standards). please read attached link. it is NOT SATA/ATA/SAS/PCIe device. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: best possible GJOURNAL device?
On Thu, Apr 26, 2012 at 10:42 AM, Wojciech Puchar woj...@wojtek.tensor.gdynia.pl wrote: http://www.vikingmodular.com/products/arxcis/ddr3/ddr3.html In general devices like these that I've dealt with in the past are presented as SATA or SAS devices, but some devices require additional drivers (take Ramdrives devices for instance). this one - as described - is 100% regular DDR3 DIMM and plugged as normal memory. Depends on the BIOS, the settings set in the BIOS, etc. FreeBSD is but it can be patched easily. I wouldn't depend on volatile memory working in a non-volatile manner unless it's battery backed (which companies like Ramdrive, STEC, this is supercapacitor backed. after poweroff it have enough time to write all to SLC flash chip. How to get DRAM controller mapping i mean what DIMM is at what address? What is located where should be opaque if the designer designed it properly (otherwise a driver will need to be added to interface with the device if the vendor is trying to be clever or is not fully conforming to ATA/SCSI standards). please read attached link. it is NOT SATA/ATA/SAS/PCIe device. I just read the product tearout. It says that it depends purely on BIOS support, which may or may not exist for your motherboard (and there's an SSD that it uses to write out the data in the event that power fails). So I'm guessing that if it works with your motherboard, it will work regardless of the OS. How it's presented to the OS? ENOCLUE (ask Viking). Thanks, -Garrett ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
Re: best possible GJOURNAL device?
power fails). So I'm guessing that if it works with your motherboard, it will work regardless of the OS. How it's presented to the OS? ENOCLUE (ask Viking). it is DDR3 DIMM so it is presented as RAM. ENODRIVER in FreeBSD. but could be trivial to implement, if it is known on which memory address (non-translated) this exist. ENOIDEA about price too. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
