On Sunday 19 October 2014 13:35:15 C. SB did opine And Gene did reply: > > sympathizing with their captors. When I suggest how easy it'd be to > > swap hard drives and install LinuxCNC and use the same hardware, > > I need to violently disagree with this. On my setup, swapping drives > has been pure hell. With lava and everything. > > First HDD (80GB IDE) had a DMA bug that caused >10ms latency jitter. > -> Unfixable because newer libata doesn't work with hdparm anymore ! > Second HDD (4GB IDE): tried copying setup from first HDD, but got > tangled in a mess of UUID mismatch and "root not found" errors. > -> Had to reinstall from scratch. > Third HDD (2TB SATA), brand new, isn't detected by all 3.x linux > kernels I've tried (thanks, libata). To add insult to injury, winXP > detects it just fine. > So I'm back to HDD #2. I'm not going to try to see how much time I've > wasted on this. I'm not even done yet. > I can tell a different story. I bought a 3 drive sata cage from an online vendor 2 or 3 years back, $70 at the time, and actually have 4 1Tb drives in this machine.
I use one for vtapes backups with amanda, a second has a new install of 12.04 LTS on it, the third one had the last pre-ubuntu (pcLOS) install on it, basically so I can maintain continuity, currently booted to 10.04.4 LTS, but a quick shut down, and an interchange of the upper 2 drives in that cage, accomplished by opening the doors and swapping their positions, and I can reboot to 12.04 LTS. That 2Tb sata is more than likely a 4kb sector drive, and the kernel you are using doesn't have that extension enabled, or your mobo hardware is too old. But 4k drive hardware has been available for quite a while, my now elderly ASUS M2N-SLI Deluxe I bought as soon as the AMD Phenoms came out, (2007?) works just fine because one of my 1Tb drives is a 4k sector drive. Its so transparent I wasn't even aware of it till I noticed it said so on the white drive label one day while swapping them around. The IDE interface can wreck your latency figures, mine got immediately better with the switch to sata. > When I recommend linuxCNC (I do), I never, ever mention swapping HDDs. > What I do mention is: > - incredibly excellent docs compared to Mach > - very coherent config (.ini, .hal, .xml : one directory) > > CSB > > ----------------------------------------------------------------------- > ------- Comprehensive Server Monitoring with Site24x7. > Monitor 10 servers for $9/Month. > Get alerted through email, SMS, voice calls or mobile push > notifications. Take corrective actions from your mobile device. > http://p.sf.net/sfu/Zoho > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
