Re: Storage (8*IDE HDs) any experiences?
hi ya... good that these huge systems exists... att is working on a 12disk ide system... your options for 6 or 8 disks are the promise cards and/or 3ware ... has anybody measured the +12V current needed when all 8 drives start up...at the same time... hummm we have a 1u chassis ( C2300 ) that fits 6 drives we have 4 and 8 drive models in prototype stage... have fun raiding alvin http://www.Linux-1U.net .. 500Gb 1U raid5 ( ide or scsi3 )... On Thu, 26 Apr 2001, Bryan Andersen wrote: > Dimitri Maziuk wrote: > > > > Hi all > > > > I notice there are these new-fangled motherboards with 2*ATA-100 and > > 2*ATA-33 ports. With 75GB disks, that baby should give us 600GB of raw > > disk space (8 drives) at around $2K US. Sounds attractive, considering > > that el-cheapo RAID boxes of similar capacity are around $10K. > > > > Anyone runs [Debian] Linux on an 8-drive box like that? Is that > > supported at all? Any gotchas I should know about? The mobo I'm looking > > at is ABIT BH6-II. > > It's supported. I don't know about your motherboard. I have a > Promise Ultra 100 on an older MB. Just make sure your power > supply is up to it. I patched a 2.2.18 kernel to add support > for the Ultra 100. Beyond that it's stock. Note, I had to make > the /dev/hd[efgh]* devices. Sofar I haven't done anything with > raiding them. A friend's experience shows that raid 0 and 1, > striping and mirroring, works quite nicely and fast while raid > 5 is slow. This is due to the CPU having to calculate the raid > 5 checks blocks. > > The major issue I've run into is finding places for my 6 HDs. > I ended up using a couple plates of metal to make a short tower > to hold 4 of them in front of a fan. > > This is the df from my system. > Filesystem 1k-blocks Used Available Use% Mounted on > /dev/hdc1 120995100189 14558 88% / > /dev/hdc2 3937316531616 3205688 15% /tmp > /dev/hdd2 3937316317652 3419652 9% /var > /dev/hdc3 25486572 2089916 22878796 9% /usr > /dev/hdd3 25486572 12028780 12939932 49% /home > /dev/hde2 44171784 38973680 4307648 91% /data1 > /dev/hdg2 44171784 37325684 5955644 87% /data2 > /dev/hdh2 79227344 67338352 11093560 86% /data3 > /dev/hda5 11542670 9426807 2115863 82% /winE > > > -- > | Bryan Andersen | [EMAIL PROTECTED] | http://www.nerdvest.com | > | Buzzwords are like annoying little flies that deserve to be swatted. | > | -Bryan Andersen| > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] >
Re: Storage (8*IDE HDs) any experiences?
hi dima think different motherboard uses different onboard ide controllers... ( dont know which one is which... - promise card i was referring to is the Proise ata/100 series not the onboard controllers yes... most 1U chassis comes with one 1 power supply... ( no physcial room in the back... -- sorta offtopic...but thought i'd add the comments -- and we can discuss offline if needed... one 1u manufacturer put a powersupply in front and one powersupply in the back... - a neater option would have been to use the newer mini-atx motherboard...about 8"x8" square... which still have room for 2 1u powersupply in the back... - even if you had 2 power supplies... - most motherboards only has one atx power connector - are the two power supplies properly doing load sharing... - when/how does the redundant power circuit kill off the other dying/dead power supply - if the motherboard did have 2 atx connectors... - is it doing proper load sharing??? - can the 2nd power supply drive the motherboard even if the other powersupply is dead - if you had two power supplies... - how does the disk gets it spower... ( need special circuitry to drive the disks ( minimally, 2 diodes for each of the power supply fun stuff alvin http://www.Linux-1U.net ... On Thu, 26 Apr 2001, Dimitri Maziuk wrote: > On Thu, Apr 26, 2001 at 03:23:03PM -0700, Alvin Oga wrote: > ... > > your options for 6 or 8 disks are the promise cards > > and/or 3ware ... > > Well, unfortunately purchasing is a bit strange around here... > That mobo (with HPT-370 controller) is the one we can buy > _easily_ -- from the university's techstore. A mobo with > promise is a bit more difficult... > > > has anybody measured the +12V current needed when all > > 8 drives start up...at the same time... hummm > > Yes, n+1 PS sound like a good idea for this sort of work. > I notice your 1U cases only have one PS. ;) > > Thanks > Dima > -- > E-mail dmaziuk at bmrb dot wisc dot edu (@work) or at crosswinds dot net > (@home) > http://www.bmrb.wisc.edu/descript/gpgkey.dmaziuk.ascii -- GnuPG 1.0.4 public > key > We're sysadmins. Sanity happens to other people. -- Chris King in asr > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] >
Re: (OT) Storage (8*IDE HDs) any experiences?
hi ya... might be easier/cheaper to use a simple RC delay to deliver power to the IDE disks before the motherboard actually gets the "power up" - remember that the atx powersupply has a "power-ok" signal to tell the motherboard go ahead and power up... ( aka the power switch ) each ide disks takes about 1Amp at 12v to sping up the drive... and most atx powersupply is on that borderline at 8 drives.. 4-drives is no big issue you can fit 2 power supply into a 1U chassis if you used 8"x8" sized atx motherboards... one of the 1u cases...put a power supply in the front and another at the back. ( kinda funky ) c ya alvin On Sat, 28 Apr 2001, Brandon High wrote: > On Sat, Apr 28, 2001 at 11:50:26PM +0200, Andreas Bombe wrote: > > The IBM SCSI disk I have here has a jumper to delay spin up depending on > > SCSI ID so that an array of those would spin up sequentially if they all > > had those jumper set (and different IDs, which they need anyway). Maybe > > there are IDE drives built with RAIDs in mind offering some similar > > option? > > I doubt it, but with a sufficiently large case (or small power supply) it may > be possible to stick a 2nd (or 3rd) power supply in. Drives could be plugged > into the second PS while the MB is powered off of the primary PS. >
Re: (OT) Storage (8*IDE HDs) any experiences? +55v
hi yes gnd should be connected... if +5v, +3.3v is NOT connected together... and assuming you have 2 powersupplies.. and if the power supply to the disk dies... than you're out of luck or if the powersupply tot eh motherboard dies... you'd be out of luck too in which case...whats thepoint of having 2 PS ??? - if it cannot handle the load...get a bigger power supply - having 2 power supplies complicates things.. and some devices running at 12.5v and others at 11.5v.. at the extreme voltage ranges ... similarly for +5v range and +3.3 ranges...( all kinds of possible random timing problems?? if you do have 2 power supplies.. you should invest in a properly designed load-sharing power circuitry such that the other supply can drive all devices it needs by itself... - or just get a powersupply with 2x the capacity too does almost the same trick.. - except if the one supply dies...you're dead... some ( supermicro ) motherboards has dual atx connectors ...but the disks are not yet dual-power supplied... :-( and we wont even talk about the UPS triggering a shutdown in these cases... what a mess... but fun !!! c ya alvin http://www.Linux-Sec.net ... On Wed, 2 May 2001, Hamish Moffatt wrote: > On Tue, May 01, 2001 at 07:46:42PM +1000, Hamish Moffatt wrote: > > On Tue, May 01, 2001 at 11:03:06AM +0200, Russell Coker wrote: > > > On Monday 30 April 2001 00:04, Hamish Moffatt wrote: > > > > I don't see why. Nor is this any different to any external drives. > > > > You have a hefty ground connection between the power supplies anyway > > > > (the mains, plus the metal case acting as ground). > > > > > > External drives generally don't use an ATA interface! I am not confidant > > > of > > > the main earth acting as a suitable earth for the DC power. > > > > True, but I don't see this as a big issue. > > You could connect the DC grounds of the two supplies together safely. > Don't connect any other rails together though. > > > Hamish > -- > Hamish Moffatt VK3SB <[EMAIL PROTECTED]> <[EMAIL PROTECTED]> > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] >
Re: (OT) Storage (8*IDE HDs) any experiences? - diodes
hi ya > I think if you use a diode to connect the outputs you are limiting > the current flow in one way only. And why would you want to do this? the diodes need to be power diodes... vs signal diodes given you cannot tie the power supplies at two diff voltages together... you have to isolate it somehow... ( the power diode method ) - even putting two batteries in parallel dont work... - - and it gets real fun when you put car batteries in parallel - and if you can get it working... it makes for a very good UPS - - one car battery lasts about 15hrs ...for a P3-500 class server - sitting idle with no AC power yes...it might limit the current... and a resistor is bad too cause they both nullifies/weaken the accurate "voltage regulation".. - ie. big current spikes will occur but more importantly, its primary purpose is to allow for the two power supply at different voltages ( +5.25v and +4.75v ) to be tied together at these extremes... the diodes wont helpand the dioes will simply burn up due to the current it has to pass to get to that "voltage" one side being a diode drop ( 0.7v ) across itself.. - a power mosfet is better suited ... think we're going off course...but... thats the fun of watching things blow up in the lab when ne does whacky things like connect two power supplies together??? ( smoke test or heat test ) c ya alvin http://www.Linux-1U.net ...
