On 10 October 2016 at 02:01, ronnie sahlberg <ronniesahlberg@xxxxxxxxx> wrote: > (without html this time.) > > Nas drives are more expensive but also more durable than the normal consumer > drives, but not as durable as enterprise drives. > They are meant for near continous use, compared to consumer/backup drives > that are meant for only occasional use and meant to spend the majority of > time spinned down. > > > They fall in-between consumer and enterprise gear. > Again, you read a marketing flyer ... Historically enterprise drives did equal to a drive with SCSI, after that it started to equal to a drive with more exotic interfaces like SAS or FATA ... nowadays this means more in line "high [seak] performance, for which you pay extra extra extra buck" (10k, 15k arrays of 10 disks with databases on it that are serving plenty of people ?). Currently, customer = low end drive where you will not pay twice the price for 10% performance increase. There is nothing there about reliability !!! Now every [sane] storage engineer will chose a "customer" 5.4k drives for a cold storage / slow IO storage. In high demand, very random seek patterns everybody will go for extreme fast disk that will die in 12 months, because cost * effort or replacing a failed disk is still less than assembling a like array from 7.2k disk (extra controller, extra bays, extra power, extra everything !). So: 1. Stop reading a marketing material that is designed to suck money out of you pocket. Read technical datasheet. Stop reading a paid for articles from so called "specialists", my company pays those people to put in articles that I write to sound more technical so I can tell you how much "horse" those are. 2. hdd: faster rpm = better seek + better sequential read write slower rpm = survives longer + takes less power + better $ per GB 3. what you need to use it for: a remote nas box ? a single 5.1k hdd will saturate your gigabit lan, 7 will saturate your SFP+ - go for best $ per GB local storage ? 4 x 7.1k hdd in raid10 and you're talking a good performance ! putting more disks in and you can drop down to 5.1k a high demand database with thousands of people punching milions of queries a second ? 15k as many as you can! 4. For time being on btrfs give raid 5 & 6 a wide berth for time being ... unless you back up your data [very] regularly than, have fun :) -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
