If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
|
Thread Tools | Display Modes |
#11
|
|||
|
|||
PSU ?
philo wrote:
On 7/1/19 9:59 AM, John McGaw wrote: On 6/30/2019 7:00 PM, philo wrote: On 6/30/19 9:29 AM, John McGaw wrote: On 6/26/2019 9:27 AM, philo wrote: I've repaired thousands of machines and once in a while have seen a failed power supply take out a motherboard. Only once though have I seen the hard drives taken out. It was with a good quality supply and I thought it was just a very odd fluke. Last night I talked to someone who had also had it happen ,....so my question is: Does any manufacturer have a supply with fully surge-protected OUTPUT? I assumed they all did. I, too, have had one PSU misbehave and take out a hard drive but that was a very long time ago and with a no-name PSU. I learned my lesson after that and now use nothing but Seasonic supplies, at least in situations where they make a supply that will fit. Right now the only computers I own that don't have Seasonic are my Shuttle cubes and they are tied to the form-specific equipment. Luckily the Shuttle PSUs have proven to be faultless also. I don't know of any maker that installs crowbar protection on their supplies although I believe it would take little more than a high-current SCR a Zener diode and a few other passive components to work the magic. All I know is that for industrial use MOV's were everywhere and they worked. That said, If I try my own modifications I'll do it on a non-critical machine first. Will also look into Seasonic PSU's, thanks Oh, I've use MOVs for various things but the problem is that they aren't all that precise. Great at absorbing and dissipating lots of power but the voltage at which they operate are vague at best. I've used bushels of them protecting broadcast and computer equipment from line transients but I'd be hard pressed to set them up to protect a 12V circuit from going above 13.5V where damage to a hard drive might be expected to begin. A glance at some spec sheets suggests that using a 12V MOV the clamping voltage might be 40+. But if you decide to give it a shot and make it work well, please let up know. Well, if I install MOV's and never have a HD burn out again it still does not prove they did the trick. I have a few other ideas though. The person I know who lost two drives had a RAID 1 (mirrored) so he thought he was safe. Now I see that one possible way to build a reliable machine would be to have each drive powered by a completely separate supply and probably from a different manufacturer. That said, it's been my experience in life that no matter what you plan for, something else is going to happen! Maybe I'll just continue doing backups because to reinstall the OS is not a big deal...all that's important it the data Even the RAID controller itself can fail and damage an array. We lost two RAID5 arrays at work due to that. The first failure, there were no "lessons learned" - the staff just restored and pretended nothing happened. The second failure prevented hundreds of employees from working at 2PM in the afternoon. And *that* failure, finally got some executive oversight. One poster on USENET, recounts how a SIL3112 failed in an interesting way. One day, one of the two drives in RAID1 failed. Fine, the thing continued to work with the remaining drive (as intended). However, the files on the second drive *were three months old*. In other words, the (software) RAID stopped mirroring *three months* before one of the drives failed. There were no warning signs or error messages. It's not normal for array products like this, to carry out any sort of audit and warn you of that sort of problem (drive mis-match while mirroring). All that RAID really does, is introduce more failure modes. So even if you power the drives separately, put the drives in different computers so the SATA ports are separated, there is still the danger of a firmware or software failure failing to meet functional requirements. Paul |
#12
|
|||
|
|||
PSU ?
On 7/1/19 12:26 PM, Paul wrote:
philo wrote: On 7/1/19 9:59 AM, John McGaw wrote: On 6/30/2019 7:00 PM, philo wrote: On 6/30/19 9:29 AM, John McGaw wrote: On 6/26/2019 9:27 AM, philo wrote: I've repaired thousands of machines and once in a while have seen a failed power supply take out a motherboard. Only once though have I seen the hard drives taken out. It was with a good quality supply and I thought it was just a very odd fluke. Last night I talked to someone who had also had it happen ,....so my question is: Does any manufacturer have a supply with fully surge-protected OUTPUT? I assumed they all did. I, too, have had one PSU misbehave and take out a hard drive but that was a very long time ago and with a no-name PSU. I learned my lesson after that and now use nothing but Seasonic supplies, at least in situations where they make a supply that will fit. Right now the only computers I own that don't have Seasonic are my Shuttle cubes and they are tied to the form-specific equipment. Luckily the Shuttle PSUs have proven to be faultless also. I don't know of any maker that installs crowbar protection on their supplies although I believe it would take little more than a high-current SCR a Zener diode and a few other passive components to work the magic. All I know is that for industrial use MOV's were everywhere and they worked. That said, If I try my own modifications I'll do it on a non-critical machine first. Will also look into Seasonic PSU's, thanks Oh, I've use MOVs for various things but the problem is that they aren't all that precise. Great at absorbing and dissipating lots of power but the voltage at which they operate are vague at best. I've used bushels of them protecting broadcast and computer equipment from line transients but I'd be hard pressed to set them up to protect a 12V circuit from going above 13.5V where damage to a hard drive might be expected to begin. A glance at some spec sheets suggests that using a 12V MOV the clamping voltage might be 40+. But if you decide to give it a shot and make it work well, please let up know. Well, if I install MOV's and never have a HD burn out again it still does not prove they did the trick. I have a few other ideas though. The person I know who lost two drives had a RAID 1 (mirrored) so he thought he was safe. Now I see that one possible way to build a reliable machine would be to have each drive powered by a completely separate supply and probably from a different manufacturer. That said, it's been my experience in life that no matter what you plan for, something else is going to happen! Maybe I'll just continue doing backups because to reinstall the OS is not a big deal...all that's important it the data Even the RAID controller itself can fail and damage an array. We lost two RAID5 arrays at work due to that. The first failure, there were no "lessons learned" - the staff just restored and pretended nothing happened. The second failure prevented hundreds of employees from working at 2PM in the afternoon. And *that* failure, finally got some executive oversight. One poster on USENET, recounts how a SIL3112 failed in an interesting way. One day, one of the two drives in RAID1 failed. Fine, the thing continued to work with the remaining drive (as intended). However, the files on the second drive *were three months old*. In other words, the (software) RAID stopped mirroring *three months* before one of the drives failed. There were no warning signs or error messages. It's not normal for array products like this, to carry out any sort of audit and warn you of that sort of problem (drive mis-match while mirroring). All that RAID really does, is introduce more failure modes. So even if you power the drives separately, put the drives in different computers so the SATA ports are separated, there is still the danger of a firmware or software failure failing to meet functional requirements. Â*Â* Paul Maybe I'll just quit worrying about it and continue to to backups frequently |
#13
|
|||
|
|||
PSU ?
On 7/1/19 10:38 AM, John McGaw wrote:
On 7/1/2019 11:20 AM, philo wrote: On 7/1/19 9:59 AM, John McGaw wrote: On 6/30/2019 7:00 PM, philo wrote: On 6/30/19 9:29 AM, John McGaw wrote: On 6/26/2019 9:27 AM, philo wrote: I've repaired thousands of machines and once in a while have seen a failed power supply take out a motherboard. Only once though have I seen the hard drives taken out. It was with a good quality supply and I thought it was just a very odd fluke. Last night I talked to someone who had also had it happen ,....so my question is: Does any manufacturer have a supply with fully surge-protected OUTPUT? I assumed they all did. I, too, have had one PSU misbehave and take out a hard drive but that was a very long time ago and with a no-name PSU. I learned my lesson after that and now use nothing but Seasonic supplies, at least in situations where they make a supply that will fit. Right now the only computers I own that don't have Seasonic are my Shuttle cubes and they are tied to the form-specific equipment. Luckily the Shuttle PSUs have proven to be faultless also. I don't know of any maker that installs crowbar protection on their supplies although I believe it would take little more than a high-current SCR a Zener diode and a few other passive components to work the magic. All I know is that for industrial use MOV's were everywhere and they worked. That said, If I try my own modifications I'll do it on a non-critical machine first. Will also look into Seasonic PSU's, thanks Oh, I've use MOVs for various things but the problem is that they aren't all that precise. Great at absorbing and dissipating lots of power but the voltage at which they operate are vague at best. I've used bushels of them protecting broadcast and computer equipment from line transients but I'd be hard pressed to set them up to protect a 12V circuit from going above 13.5V where damage to a hard drive might be expected to begin. A glance at some spec sheets suggests that using a 12V MOV the clamping voltage might be 40+. But if you decide to give it a shot and make it work well, please let up know. Well, if I install MOV's and never have a HD burn out again it still does not prove they did the trick. I have a few other ideas though. The person I know who lost two drives had a RAID 1 (mirrored) so he thought he was safe. Now I see that one possible way to build a reliable machine would be to have each drive powered by a completely separate supply and probably from a different manufacturer. That said, it's been my experience in life that no matter what you plan for, something else is going to happen! Maybe I'll just continue doing backups because to reinstall the OS is not a big deal...all that's important it the data There is no substitute for backups. No matter what. I am quite paranoid about protecting my primary machine. As I write this it is doing its monthly backup which will go into the bank's vault this afternoon -- there are three portable drives cycling through these backups. Every evening it does a full backup to my elderly WHS and at 1AM it did a backup to one of my redundant Drobo NAS units. Oh, and as the mood strikes me I do a system disk image to a series of portable SSD units that are kept in a media safe here at home in case I need to restore a bootable image. I have been burned too many times by seemingly random glitches. This level of backup would be overkill for most people but I believe that any user who doesn't have at least two levels of backup, one of them offsite but under his/her direct control, is a fool and probably deserves whatever comes their way. I back up often so I guess I will quit worrying about this |
|
Thread Tools | |
Display Modes | |
|
|