jwcolby
jwcolby at colbyconsulting.com
Thu Jul 22 12:54:42 CDT 2010
LOL, the 2 gig drives are dropping in price (finally). I haven't even seen rumors of larger than that, though they will arrive some day of course. In the end, data always exceeds storage so a single drive solution seems to me to be less than useful. John W. Colby www.ColbyConsulting.com Michael Bahr wrote: > And it is probrably running embedded Linux. > > Also wait until the 6TB HD come out--oh my. > > Mike... > >> A few months ago, saw a network capable RAID 1 hard drive setup for >> ~$200, without the drives. Just a box with a network port. Terrabyte >> drives are getting pretty cheap, so you could get a networked mirrored >> 1+ terabyte setup for about 400. >> >> Drew >> >> -----Original Message----- >> From: accessd-bounces at databaseadvisors.com >> [mailto:accessd-bounces at databaseadvisors.com] On Behalf Of Michael Bahr >> Sent: Wednesday, July 21, 2010 12:42 PM >> To: Access Developers discussion and problem solving >> Subject: Re: [AccessD] Google's Disk Failure Experience >> >> Well, I can see your point that only ripping DVD's takes 2 minutes each >> and you do not need them anymore. But for me I record OTA/cable HD >> shows >> and uncut movies and cut out the commercials and archive them. Now I >> have >> whole seasons worth of shows and movies. I save money buy not buying >> the >> Blu-Ray disks ($30-$60 for each season or movie). So yes it is >> important >> to me to have a backup as these are not reproducible. A seperate media >> server setup as raid 1 does fit my needs. >> >> Mike... >> >>> >How much is your time worth? >>> >>> This is a classic case of insufficient analysis... >>> >>> The cost is not the cost of the drive. It is the cost of the drive >> (twice >>> the drives), plus the >>> cost of the SATA ports (twice) plus the cost of the power supply >> (twice >>> the disk current - 12v), >>> plus the cost of electricity to run the disks (twice the electricity) >> plus >>> the cost of a case big >>> enough to handle enough drives (twice as large disk cage) plus... >>> >>> Of course all my "twices" are on a "per disk used" basis, not a total >>> system cost and I understand >>> the difference. >>> >>> Furthermore, my time isn't the cost of my time to rip 200 dvds, it is >> the >>> cost of my time to rip 200 >>> dvds divided by the probability of losing 2 disks at the same time. >>> >>> I ripped my drives as I wanted to watch them, so it was an incremental >>> cost accumulated over time. >>> The actual time is about 2 minutes per dvd. 200 dvds per drive is an >>> actual cost of 200 minutes to >>> fill a drive. Would I actually rerip all of the disks? No because >> many >>> of them are for my kids who >>> are now older and don't even watch those disks any more, not to >> mention >>> the disks I ripped that I >>> just don't care about. >>> >>> HOWEVER... In the two years that I have been using the system, I have >>> never lost one of these >>> drives. Thus my time to "do it over again" is zero (so far). I have >> been >>> working with raid >>> extensively for about 5 years, and in those 5 years I have lost single >>> drives but I have never lost >>> two drives at the same time. >>> >>> I am sure that there are numbers out there that discuss the >> probability of >>> two drive failures. In >>> fact IIRC from that paper by google, the probability of failure of any >>> given single drive over 5 >>> years was about 14%? The probability of two failures (my simple math) >>> would be .14 * .14 = .0196 or >>> ~ 2%. That is for two failures, NOT two SIMULTANEOUS failures. >>> >>> All of this matters if the cost is catastrophic. Facing a 2% chance >> that >>> I will have to re-rip 200 >>> dvds in any given 5 year period, I am unwilling to commit the extra >> money >>> to preventing this >>> possibility. >>> >>> This whole discussion does point out that an analysis of the actual >>> numbers might cause one to come >>> to a different conclusion. And who knows, you might decide "screw the >>> costs", it is worth it to me. >>> >>> It is not worth it to me. >>> >>> Look at Unraid. >>> >>> http://lime-technology.com/ >>> >>> I am not trying to sell anyone on unRaid, I am simply saying consider >> it >>> for a specific class of >>> redundancy needs. For this level of redundancy need, unRaid seems >> like a >>> good compromise. >>> >>> John W. Colby >>> www.ColbyConsulting.com >>> >>> >>> Michael Bahr wrote: >>>> John, for your media collections you really should go only Raid 1. >> Yeah >>>> if you lose the HD you can re-do everything but who has the time? >>>> Besides >>>> 2TB HD's are ~<$150 or so. How much is your time worth? >>>> >>>> Mike... >>>> >>>>> I am about to build an UnRaid for my massive video / music >> collection. >>>>> I >>>>> currently have no >>>>> protection on that so if I lose a disk I lose all of that on one >> disk. >>>>> With Unraid I >>>>> would have "raid 5 like" >>>>> storage so that in the event of single drive failure I can still >>>>> recover. >>>>> If I do lose it I just >>>>> re-rip. Not the end of the world but not something I want to do. >>>>> >>>>> John W. 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