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#1
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15K rpm SCSI-disk
Hi.
I have a question. I am really eager to buy a Seagate Cheetah 15K rmp disk for my workstation. The only issue is that I've heard that these disks are not suitable for frequently power on/off, i.e. turning off the computer once or twice+ a day. They're more suitable to be left on, in e.g. a server, and that it is hazardous to power on/off frequently. Is this correct? Thanks, Ronny Mandal |
#2
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Besides this these disks are way to expensive and you get much better
performance and several times the storage space by spending that money on a RAID array. Why you need a Cheetah 15k disk? - Joris "Ronny Mandal" wrote in message ... Hi. I have a question. I am really eager to buy a Seagate Cheetah 15K rmp disk for my workstation. The only issue is that I've heard that these disks are not suitable for frequently power on/off, i.e. turning off the computer once or twice+ a day. They're more suitable to be left on, in e.g. a server, and that it is hazardous to power on/off frequently. Is this correct? Thanks, Ronny Mandal |
#3
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In fact I do not need it, I need performance.
So you are saying that two IDE in e.g. RAID 0 wil outperform the SCSI disk in speed, besides storgae etc? Thanks. Ronny Mandal "Joris Dobbelsteen" wrote in message ... Besides this these disks are way to expensive and you get much better performance and several times the storage space by spending that money on a RAID array. Why you need a Cheetah 15k disk? - Joris "Ronny Mandal" wrote in message ... Hi. I have a question. I am really eager to buy a Seagate Cheetah 15K rmp disk for my workstation. The only issue is that I've heard that these disks are not suitable for frequently power on/off, i.e. turning off the computer once or twice+ a day. They're more suitable to be left on, in e.g. a server, and that it is hazardous to power on/off frequently. Is this correct? Thanks, Ronny Mandal |
#4
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On Wed, 3 Nov 2004 21:22:20 +0100, "Joris Dobbelsteen"
wrote: Besides this these disks are way to expensive and you get much better performance and several times the storage space by spending that money on a RAID array. Why you need a Cheetah 15k disk? Compared to low-end RAID, 1 or 2 of these drives would still bring incredible responsiveness but with much higher reliability, simplicity of installation, maintenance, & potential troubleshooting down the line, as well as less power consumption, heat, or potential PSU issues. You simply cannot compare the overall user productivity and computing experience with 1 or 2 good enterprise quality drives to a personal storage caliber 'array'. IMHO RAID is not worth doing without a decent controller and disks as reliable as cheetahs - so doing it 'right' wouldn't save and money. Plus if he is planning to frequently power cycle, RAID of any caliber is the last thing you want to recommend (for multiple reliability-related reasons for starters). - Joris "Ronny Mandal" wrote in message ... Hi. I have a question. I am really eager to buy a Seagate Cheetah 15K rmp disk for my workstation. The only issue is that I've heard that these disks are not suitable for frequently power on/off, i.e. turning off the computer once or twice+ a day. modern enterprise drives should be fine power cycling a couple times per day for several years. While personal storage devices are more geared to this use both have a limit before affecting reliability - so it's not ideal in either case. They're more suitable to be left on, in e.g. a server, and that it is hazardous to power on/off frequently. Is this correct? Sort of. You might also not want to go too long without powering off these drives for relaibility reasons also. The fluid bearing cheetahs are wonderful & have an excellent track record. Highly reliable, durable, quiet, and extremely responsive. I wouldn't worry too much & consider it a safe purchase you shouldn't regret. Any add-on controller (SCSI, SCSI RAID, ATA RAID, SATA RAID) may affect power features and may be more of a concern (resuming power may be delayed or poor drivers may prohibit certain power features.) So the simpler the disk subsystem the more likely you will have success using various convenience related features associated with turning on the computer a few times/day. Today's computers in general are less temperamental and susceptible to problems from frequent power cycling but it is still not ideal. If you have a good machine why not leave it on a good deal of the time and have it do stuff for you or have it available to access if you need something but are away? |
#5
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On Thu, 4 Nov 2004 10:27:49 +0100, "Ronny Mandal"
wrote: In fact I do not need it, I need performance. So you are saying that two IDE in e.g. RAID 0 wil outperform the SCSI disk in speed, besides storgae etc? Speed at what, specifically? Will there be a lot of multiple simultaneous I/O or a lot of random access like with running OS or large database work or need for highest sustained throughput? (pick one) Will your work involve different source and destination files of fair size like with video editing? I wouldn't worry about power or heat too much. Well, they are concerns but all that need be done is to have adequate airflow and power, as with any other configuration. Spin-up frequency effects all drives, not just the SCSI you mention. For maximum life they should be kept spinning, there is nothing unique about the mentioned drive that would make it more (or less) problematic to turn system off or let it sleep. Well, perhaps slightly worse for a higher RPM drive, having higher stress to spin-up to higher RPM, but relatively speaking the stress of that will impact any drive. |
#6
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"Ronny Mandal" wrote in message ... Hi. I have a question. I am really eager to buy a Seagate Cheetah 15K rmp disk for my workstation. The only issue is that I've heard that these disks are not suitable for frequently power on/off, i.e. turning off the computer once or twice+ a day. They're more suitable to be left on, in e.g. a server, and that it is hazardous to power on/off frequently. Is this correct? High RPM SCSI disks sound like ****e when powering up, so i would assume that they dont like it too much. hamman |
#7
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On Thu, 4 Nov 2004 19:42:45 -0000, "Hamman" wrote:
High RPM SCSI disks sound like ****e when powering up, so i would assume that they dont like it too much. hamman Depends on the drive. Earlier drives like the IBM Ultrastar 36Z15 tend to sound pretty crappy. Seagate's fluid dynamic bearing motors like in the X15-36LP or more current 15K.3 are very quiet and very nice to work with. While many 10k or 15k drive tend to exhibit a temporary faint high pitched sound during power-up, my understanding is the reliability issue has to do with wear related to the head parking in the landing zone and not the motor per se. |
#8
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Hmm.
Fast access to files, short response times, fast copying - just some luxury issues. And the I tend to power up in the morning, approx. 6:am and power down at about 22:30 ++ Ronny Mandal "kony" wrote in message ... On Thu, 4 Nov 2004 10:27:49 +0100, "Ronny Mandal" wrote: In fact I do not need it, I need performance. So you are saying that two IDE in e.g. RAID 0 wil outperform the SCSI disk in speed, besides storgae etc? Speed at what, specifically? Will there be a lot of multiple simultaneous I/O or a lot of random access like with running OS or large database work or need for highest sustained throughput? (pick one) Will your work involve different source and destination files of fair size like with video editing? I wouldn't worry about power or heat too much. Well, they are concerns but all that need be done is to have adequate airflow and power, as with any other configuration. Spin-up frequency effects all drives, not just the SCSI you mention. For maximum life they should be kept spinning, there is nothing unique about the mentioned drive that would make it more (or less) problematic to turn system off or let it sleep. Well, perhaps slightly worse for a higher RPM drive, having higher stress to spin-up to higher RPM, but relatively speaking the stress of that will impact any drive. |
#9
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On Fri, 5 Nov 2004 11:00:42 +0100, "Ronny Mandal"
wrote: Hmm. Fast access to files, short response times, fast copying - just some luxury issues. And the I tend to power up in the morning, approx. 6:am and power down at about 22:30 ++ Ronny Mandal The 15K SCSI drive will be of more benefit than a pair of typical ATA in RAID0. A good cost-effective compromise (particularly if you don't have a decent SCSI controller already) would be an SATA Western Digital Raptor 74GB, or a pair of them... ideally the OS, applications, and the data files would be on different drives. Powering on once a day seems reasonable enough for any drive. Either way the best course of action is still to make regular backups. |
#10
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"kony" wrote in message
... On Fri, 5 Nov 2004 11:00:42 +0100, "Ronny Mandal" wrote: Hmm. Fast access to files, short response times, fast copying - just some luxury issues. And the I tend to power up in the morning, approx. 6:am and power down at about 22:30 ++ Ronny Mandal The 15K SCSI drive will be of more benefit than a pair of typical ATA in RAID0. A good cost-effective compromise (particularly if you don't have a decent SCSI controller already) would be an SATA Western Digital Raptor 74GB, or a pair of them... ideally the OS, applications, and the data files would be on different drives. Powering on once a day seems reasonable enough for any drive. Either way the best course of action is still to make regular backups. -- Thanks for the advice. I'll consider a stripe-set of WDC Raptor 10K or the Seagate Cheetah 15K. Regards, Ronny Mandal |
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