I live in Portland OR USA. My basement runs about 68F (20C) peak. That is with my NAS at 100% activity for 40hours+. That is why cooling was not included in my calculation. One could also include 2~3 year drive warranties into the equation of spin up/down. Wow. This whole topic is becoming a really good Wiki article. I remember a staggering option some where in the firmware of the cards. I am going to check that tonight, before I spend any moneys. I have two SSD's (240GB) RAID1. I never knew I could break the journal out to other drives?! Got any links/information on how to do this? On Thu, Aug 14, 2014 at 11:10 AM, Bill Davidsen <davidsen@xxxxxxx> wrote: > Roman Mamedov wrote: >> >> On Mon, 11 Aug 2014 18:03:17 -0700 >> Adam Talbot <ajtalbot1@xxxxxxxxx> wrote: >> >>> I need help from the Linux RAID pros. >>> >>> To make a very long story short; I have a 7 disk in a RAID 6 array. I >>> put the drives to sleep after 7 minutes of inactivity. >> >> >> It is well known that repeatedly spinning a drive down/up is absolutely >> the >> worst possible thing you can do to it, from a long term reliability >> standpoint. >> So my personal suggestion would be to reconsider if you really want this. >> The >> power consumption from 7 spinning drives with no access should be no >> higher >> than 60-70 watt; IMHO saving that amount, is not something that's worth >> risking >> your disks and data for. >> > Unless you live in someplace really cold, there's the cost of pumping that > heat out of the room. Running A/C can almost double your power cost, and > running the room hot shortens your component life. In other words there's > more cost than the power for most people. Even if my hardware can run at > 90F, I can't. > > There appears to be a partial solution, get a small SDD (<$100) and put the > journal on it. Get two, run RAID1 if you must. Then configure the system to > write the journal with all data (data=journal), and the write will be really > fast, even if they don't fully complete for a minute or so. Doesn't help > reads, of course. Turns the journal into cache, sort of. > > I have the feeling that sequential spin is an option in a driver, but I > can't remember or quickly find where. I say this because I had to set it on > one machine I had, spinning up the whole array at one caused the power > supply to overload, and until I could get a bigger one which would fit I set > an option. That was long enough that I can't remember where I found that. > Turn it off and all seven drives will ask for power at once, which probably > isn't a great thing, but not my system. > > -- > Bill Davidsen <davidsen@xxxxxxx> > "We have more to fear from the bungling of the incompetent than from > the machinations of the wicked." - from Slashdot > > -- > 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 -- 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
