Re: OT: how many rankmount units is a tower-case
Hi, > The only reason I said tower is I am making the server almost identical > to my desktop machine which is the most reliable machine I have had in > my 20 year career and thus am going to be using the same case and such I'd be afraid that the "almost" would be enough to break the reliability. That said, on the idea of mounting your mother board in a rack mount case, I did that a few time, the major problem is that the CPU fan is quite high, and need some space above it for proper air-flow; so you often end-up with a 2U or 3U rack case while 1U would be enough to fit the motherboard and the disks if the vetilation for the CPU was designed for rack mount. Bests, Olivier ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
On Sun, Jan 04, 2009 at 12:42:02PM -0800, per...@pluto.rain.com wrote: > > If a hard disk formatted and used in a position , in that position > > it may be used if manufacturer is NOT advised a specific position. > > After loading of files into hard disk , change of position may > > cause difficulty in reading of already recorded data . This point > > should be considered . > > Sun, at least, used to warn about this back in the MFM/ESDI days, > recommending that a disk should be reformatted if its orientation > were changed, but those drives used all their heads for data and > depended on reproduceable mechanical positioning to align the heads > at the selected cylinder. I'm not sure it still applies to drives > that dedicate one head to fine-tuning track position by reading > factory-recorded servo patterns. (Quick check, if "actual" geometry > is known: a drive with an odd number of heads most likely has a > dedicated servo surface.) BTW most drives of that era, while OK on > either side as well as "right side up", were *not* supposed to be > run "upside down" -- the bearings were not designed for that. That may well have been true back in those days, but reasonably modern drives[*] do not have those limitations. Todays drives can be mounted in any orientation, and should have no problems being remounted in a new orientation. >From Western Digital's FAQ: Physical mounting of the drive: WD drives will function normally whether they are mounted sideways or upside down (any X, Y, Z orientation). Of course, the physical design of your system may limit the positions in which the drive can be mounted. However, in all cases, you should mount the drive with all four screws for good grounding. Also ensure that there is enough air space around the drive for adequate air flow, and avoid mounting the drive near sources of excessive heat (such as some CPUs). >From Seagate's FAQ: All Seagate & Maxtor's internal hard drives can be fitted sideways or upside down. As long as they can not be moved during use and get enough cooling it is irrelevant in which direction they are mounted. >From Hitachi's installation guide: There are many variations of system cases. Hitachi Deskstar drive can be mounted with any side or end vertical or hori- zontal. Do not mount the drive in a tilted position. [*] "resonably modern drives" includes just about all drives any sane person would even consider using for a new computer build. -- Erik Trulsson ertr1...@student.uu.se ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
1U=4.5cm Approximately :) at least in poland it's said that. i must check in my 12U rack ;) At least in the US, 1U = 1.75 inches = 4.445 cm, so an 18cm case will not quite fit into 4U. Perhaps metric racks are different. well it will with slight amount of pressure ;) to compensate this 2.8mm ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
> If a hard disk formatted and used in a position , in that position > it may be used if manufacturer is NOT advised a specific position. > After loading of files into hard disk , change of position may > cause difficulty in reading of already recorded data . This point > should be considered . Sun, at least, used to warn about this back in the MFM/ESDI days, recommending that a disk should be reformatted if its orientation were changed, but those drives used all their heads for data and depended on reproduceable mechanical positioning to align the heads at the selected cylinder. I'm not sure it still applies to drives that dedicate one head to fine-tuning track position by reading factory-recorded servo patterns. (Quick check, if "actual" geometry is known: a drive with an odd number of heads most likely has a dedicated servo surface.) BTW most drives of that era, while OK on either side as well as "right side up", were *not* supposed to be run "upside down" -- the bearings were not designed for that. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
Wojciech Puchar wrote: > 1U=4.5cm Approximately :) At least in the US, 1U = 1.75 inches = 4.445 cm, so an 18cm case will not quite fit into 4U. Perhaps metric racks are different. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
If a hard disk formatted and used in a position , in that position it may be used if manufacturer is NOT advised a specific position . After loading of files into hard disk , change of position may cause difficulty in reading of already recorded data . This point should be considered . On Sun, Jan 4, 2009 at 8:35 AM, Glen Barber wrote: > On Sun, Jan 4, 2009 at 8:33 AM, Aryeh M. Friedman < > aryeh.fried...@gmail.com> > > Small related question is there any long term harm to laying a disk on > > it's side (i.e. it lays flat when the tower is up right but on it's side > > squeezed into a rack) > > > > The ideal answer is 'no'. The 'safe' answer is 'possibly'. In other > words, I wouldn't do it personally, but I don't expect it to cause > harm. I'd suspect it'd be more succeptible to a head crash in a > vertical position. > > > -- > Glen Barber > > "Tell me and I forget. Teach me and I remember. Involve me and I > learn." - Benjamin Franklin > ___ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscr...@freebsd.org" > ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
1U=4.5cm On Sun, 4 Jan 2009, Aryeh M. Friedman wrote: I have a server that is a full tower case and want to co-locate it and all the providers list pricing in rackmount units so what value of x in xU should I get? ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org" ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
Jon Radel wrote: > Erik Trulsson wrote: > > >> I suspect that many co-location services either only accepts rack-mountable >> servers, or charge extra for non-rackmounted cases, so it might be worth >> checking that. >> > > A non-rackmountable case would require a shelf of some sort, which costs > money and generally uses up a bit more space in the rack. I suggest you > discuss this all with your vendor; they're the only people who know what > they're willing to do and how much they'll charge for it. > > --Jon Radel > j...@radel.com > The vender I have in mind has a tower price and thats how we are going so the question is pretty much mute except for future reference ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
Erik Trulsson wrote: > On Sun, Jan 04, 2009 at 08:30:50AM -0500, Glen Barber wrote: > >> On Sun, Jan 4, 2009 at 8:21 AM, Aryeh M. Friedman >> wrote: >> >>> I have a server that is a full tower case and want to co-locate it and >>> all the providers list pricing in rackmount units so what value of x >>> in xU should I get? >>> >> When it comes to rackmounts, 1U = 1.75 inches. 2U would be 3.5 >> inches, etc. I'll let you do the measuring and math. ;) >> > > It might be worth noting that 1U corresponds exactly to the height of > a typical bay for 5.25" units. > > > A normal tower case when lain on the side normally has a height > of approximately 4U. Note though that most tower cases are not designed > to be rackmounted and will not fit in typical rack. > There are some cases available though that can be used both as > floor-standing towers, or as rack-mounted cases. > > I suspect that many co-location services either only accepts rack-mountable > servers, or charge extra for non-rackmounted cases, so it might be worth > checking that The only reason I said tower is I am making the server almost identical to my desktop machine which is the most reliable machine I have had in my 20 year career and thus am going to be using the same case and such (only diff is the motherboard model is no longer avail. in ihc9 so I will have ihc10 but from my reading of -current@ and cvs-@ this is not an issue) ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
Erik Trulsson wrote: > I suspect that many co-location services either only accepts rack-mountable > servers, or charge extra for non-rackmounted cases, so it might be worth > checking that. A non-rackmountable case would require a shelf of some sort, which costs money and generally uses up a bit more space in the rack. I suggest you discuss this all with your vendor; they're the only people who know what they're willing to do and how much they'll charge for it. --Jon Radel j...@radel.com smime.p7s Description: S/MIME Cryptographic Signature
Re: OT: how many rankmount units is a tower-case
On Sun, Jan 04, 2009 at 08:30:50AM -0500, Glen Barber wrote: > On Sun, Jan 4, 2009 at 8:21 AM, Aryeh M. Friedman > wrote: > > I have a server that is a full tower case and want to co-locate it and > > all the providers list pricing in rackmount units so what value of x > > in xU should I get? > > When it comes to rackmounts, 1U = 1.75 inches. 2U would be 3.5 > inches, etc. I'll let you do the measuring and math. ;) It might be worth noting that 1U corresponds exactly to the height of a typical bay for 5.25" units. A normal tower case when lain on the side normally has a height of approximately 4U. Note though that most tower cases are not designed to be rackmounted and will not fit in typical rack. There are some cases available though that can be used both as floor-standing towers, or as rack-mounted cases. I suspect that many co-location services either only accepts rack-mountable servers, or charge extra for non-rackmounted cases, so it might be worth checking that. -- Erik Trulsson ertr1...@student.uu.se ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
On Sun, Jan 04, 2009 at 02:48:30PM +0100, Peter Boosten wrote: > > > On 4 jan 2009, at 14:35, "Glen Barber" wrote: > > > On Sun, Jan 4, 2009 at 8:33 AM, Aryeh M. Friedman > > > >> Small related question is there any long term harm to laying a disk > >> on > >> it's side (i.e. it lays flat when the tower is up right but on it's > >> side > >> squeezed into a rack) > >> > > > > The ideal answer is 'no'. The 'safe' answer is 'possibly'. In other > > words, I wouldn't do it personally, but I don't expect it to cause > > harm. I'd suspect it'd be more succeptible to a head crash in a > > vertical position. > > > > > > Most drives in an drive array are on their side, seems not to be any > problem. And if you ask the various harddisk manufacturers they will say "It will work fine. No problem." when asked if it matters if a disk is mounted horisontally or vertically or upside down. -- Erik Trulsson ertr1...@student.uu.se ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
On 4 jan 2009, at 14:35, "Glen Barber" wrote: On Sun, Jan 4, 2009 at 8:33 AM, Aryeh M. Friedman > Small related question is there any long term harm to laying a disk on it's side (i.e. it lays flat when the tower is up right but on it's side squeezed into a rack) The ideal answer is 'no'. The 'safe' answer is 'possibly'. In other words, I wouldn't do it personally, but I don't expect it to cause harm. I'd suspect it'd be more succeptible to a head crash in a vertical position. Most drives in an drive array are on their side, seems not to be any problem. Peter -- http://www.boosten.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
On Sun, Jan 4, 2009 at 8:33 AM, Aryeh M. Friedman > Small related question is there any long term harm to laying a disk on > it's side (i.e. it lays flat when the tower is up right but on it's side > squeezed into a rack) > The ideal answer is 'no'. The 'safe' answer is 'possibly'. In other words, I wouldn't do it personally, but I don't expect it to cause harm. I'd suspect it'd be more succeptible to a head crash in a vertical position. -- Glen Barber "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
Glen Barber wrote: > On Sun, Jan 4, 2009 at 8:21 AM, Aryeh M. Friedman > wrote: > >> I have a server that is a full tower case and want to co-locate it and >> all the providers list pricing in rackmount units so what value of x >> in xU should I get? >> > > When it comes to rackmounts, 1U = 1.75 inches. 2U would be 3.5 > inches, etc. I'll let you do the measuring and math. ;) > > > Small related question is there any long term harm to laying a disk on it's side (i.e. it lays flat when the tower is up right but on it's side squeezed into a rack) ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
Re: OT: how many rankmount units is a tower-case
On Sun, Jan 4, 2009 at 8:21 AM, Aryeh M. Friedman wrote: > I have a server that is a full tower case and want to co-locate it and > all the providers list pricing in rackmount units so what value of x > in xU should I get? When it comes to rackmounts, 1U = 1.75 inches. 2U would be 3.5 inches, etc. I'll let you do the measuring and math. ;) -- Glen Barber "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
