Re: [CentOS] SSD support in C5 and C6
Am 07/19/2013 03:17 AM, schrieb Lists: Main thing is DO NOT EVEN THINK OF USING CONSUMER GRADE SSDs. SSDs are a bit like a salt shaker, they have only a certain number of shakes and when it runs out of writes, well, the salt shaker is empty. Spend the money and get a decent Enterprise SSD. We've been conservatively using the (spendy) Intel drives with good results. Hm. I'm not sure, if I'd go with that. In my understanding, I'd just buy something like a Samsung SSD 840 Pro (for not using TLC) and do a overprovisioning of about 60% of the capacity. With the 512GiB-Variant, I'd end up with 200GiB netto. By this way, I have no issues with TRIM or GC (there are always enough empty cells) and wear leveling is also a non-issue (at least right now...). It's a lot cheaper than the Enterprise Grade SSDs, which are still basically MLC-SSDs and are also doing just the same as we are. And for the price of those golden SSDs I get about 7 or 8 of the Consumer SSD, so I just swap those out, whenever I feel like it. Or smart tells me to do so. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] STOP THIS THREAD NOW!
Am 04/08/2011 02:12 PM, schrieb Ian Murray: I'm really tired of this. Ralph: please unsubscribe everyone who can't shut his mouth. Thanks. A lot of of less-vocal people will thank you. Kai ___ Wow Kai, maybe you should suspend the mailing list? At least that would have some equality and fairness about it, rather than subjectively chucking people off. I thought the point of subject lines was so that an individual could chose to read the full message or not. Just skip over or filter. I consider myself as one of the less-vocal people on this list and I totally second Kai in his request. There are more than 200 messages 'discussing' this topic, everything has been said more than twice. It seems like a lot of people just rant over this topic and are not willing to accept the position of the developers - as clear or unclear as this position might have been communicated. It is not a matter of subject lines to skip messages, it's a matter of drawing their consequences for those guys. Either you skip CentOS because your not willing to accept the terms of the team or you accept the way it is. Ranting endlessly about it under the cover of trying to help or trying to improve the process will not help it. Right now we are far beyond the point discussing actual improvements, it's just ranting. Even if you consider yourself as only willing to help, the tone and mood on the list simply doesn't allow it anymore. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Server hangs on CentOS 5.5
Am 03/11/2011 03:03 AM, schrieb Nico Kadel-Garcia: On Thu, Mar 10, 2011 at 6:49 PM, B.J. McClurekeepert...@bellsouth.net wrote: B.J. McClure keepert...@bellsouth.net Sent from MacBook-Air On Mar 10, 2011, at 5:28 PM, Nico Kadel-Garcia wrote: On Thu, Mar 10, 2011 at 11:13 AM, Michael Eagerea...@eagerm.com wrote: Previous cleaning have been with canned compressed air. Thanks for the caution about vacuums and static. I may use the vacuum on the case fans from the outside. The case should provide an adequate static shield. I've had good results with a damp, soft cloth or Q-tip with distilled water for awkward bits. and filters, and that cloth for the case itself. It also looks noticeably newer, which helps with walking investors through a small machine room. I must respectfully disagree with any application of water, distilled or otherwise to things electronic. I was taught in the Navy, and my engineering career has confirmed, that cleaning of electronic components should be done with low pressure, dried, compressed air. 50 psi max. If some solvent must be used, try alcohol. Evaporates quickly, leaves no residue and has an affinity for water. Typical drug-store alcohol is rubbing alcohol, and is 30% water. I designed medical electronics for a dozen years. Acohol has its uses, but water is much cheaper, safer, and you don't have fumes to deal with. Shall we discuss the effectives of surface etch resist and cladding in protecting circuit boards from damage, and the effects of alcohol on low cost electronic sockets? I agree with Nico, I have been working for a large PC-Manufacturer in Europe for many years and alcohol was never a good idea for cleaning pcbs, not in production nor in the field. Either we used trichloroethane or trichlorotrifluoroethane for washing and cleaning of mainboards (which became a bit unpopular due to its effects on the ozone layer...) or we used water-based cleaning fluids (aka 'water'). But that was only in the production process of the pcbs. Almost never in the field, except when real repairs on the mainboard had to be done on site (soldering). Yes, it can be true with 'navy-strength' electronics that you actually can use alcohol for the purpose of cleaning electronic boards, but in low-cost electronics, it's a total no-go, because it disolves the coating of the pcbs and most often harms - as Nico wrote - the sockets and chip packages. We're talking about low-cost electronics here... Though, when cleaning machines in the field, I very rarely ever used something else then compressed air. Actually, I would suggest to everyone not to clean the inside of a box with any kind of fluid, since it actually won't do anything positive besides changing the looks. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Server hangs on CentOS 5.5
Am 03/10/2011 11:04 AM, schrieb Simon Matter: - Take a vacuum cleaner and *carefully* clean the whole box. Dust can really do bad things because it is not a perfect insulator. Never ever do that. Especially not inside the machine. There is a real risk of simply vacuuming smaller components like smd-resistors of the board. And, as already mentioned, you also have the chance of killing components by electrostatic discharge. Always use compressed air, even if just using canned one. Vacuuming is a pretty bad advice. ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] /etc/hosts - hostname alias for 127.0.0.1
Am 03/07/2011 05:34 PM, schrieb Sean Carolan: Can anyone point out reasons why it might be a bad idea to put this sort of line in your /etc/hosts file, eg, pointing the FQDN at the loopback address? 127.0.0.1hostname.domain.com hostname localhost localhost.localdomain First, if your host is actually communicating with any kind of ip-based network, it is quite certain, that 127.0.0.1 simply isn't his IP address. And, at least for me, that's a fairly good reason. Second, sendmail had the habit of breaking if your hostname was mapped to 127.0.0.1, but I stopped using sendmail a decade ago, so I can't verify this. :) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] /etc/hosts - hostname alias for 127.0.0.1
Am 03/07/2011 05:49 PM, schrieb Sean Carolan: First, if your host is actually communicating with any kind of ip-based network, it is quite certain, that 127.0.0.1 simply isn't his IP address. And, at least for me, that's a fairly good reason. Indeed. It does seem like a bad idea to have a single host using loopback, while the rest of the network refers to it by it's real IP address. Acknowledged. At least it will save you a lot of time next year, when you have forgotten about that and are wondering why every machine on the network can reach a service and only the host itself can't (or vice versa...). Second, sendmail had the habit of breaking if your hostname was mapped to 127.0.0.1, but I stopped using sendmail a decade ago, so I can't verify this. :) The reason this came up is because one of our end-users requested such a setup in the /etc/hosts file, and I didn't think it was a good idea. Seems it would be better to fix the application(s) that require the data to use the real network IP address. Most of the time it's a good idea to fix applications before ravishing your network setup to make it work. :) ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
