James, Many thanks for this very useful information!! With respect to the WD drives does this mean that they finally support Linux? I have a SATA 300 SE16 that is not yet installed because WD support says that WD does not support Linux, and with pins 5-6 jumpered it will only be a "150" drive. Do you have any further info on their Linux support?
Best regards, and again, many thanks! John On Fri, Dec 12, 2008 at 1:09 AM, James Scott Jr <[email protected]> wrote: > John, > > If what your really after is significantly higher performance and io > throughput, consider 10K speed drives. The increased speed doesn't > directly translate into increased noise. > > Look at the write, seeks, and latency times below. 10K speed drives > with 16M buffers sit right in the middle of performance and price (lower > is better on both points). > > > $169.99 Western Digital VelociRaptor WD1500HLFS > 150GB 10000 RPM SATA 3.0Gb/s Hard Drive (bare drive) - OEM > * Cache: 16MB > * Form Factor: 3.5" > * Average Seek Time: 4.2ms > * Average Write Time: 4.7ms > * Average Latency: 5.5ms > * Features: The 2.5" WD Veloci Raptor is enclosed in a 3.5" > enterprise-class mounting frame. > * Parts: 5 years limited > * Labor: 5 years limited > * Model #: WD1500HLFS > * Item #: N82E16822136296 > * > > Versus a 7200 Speed 16M > $54.99 Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s > Hard Drive - OEM > > * Cache: 16MB > * Form Factor: 3.5" > * Average Seek Time: 8.5ms > * Average Write Time: 10ms > * Average Latency: 4.16ms > * Model #: ST3250410AS > * Item #: N82E16822148262 > > $74.99 Seagate Barracuda ES.2 ST3250310NS 250GB 7200 RPM SATA 3.0Gb/s > Hard Drive - OEM > * Cache: 32MB > * Form Factor: 3.5" > * Average Seek Time: 8.5ms > * Average Write Time: 9.5ms > * Average Latency: 4.16ms > * Model #: ST3250310NS > * Item #: N82E16822148309 > > $189 Fujitsu MBA3147NC 147GB 15000 RPM SCSI Ultra320 80pin Hard Drive - > OEM > * Cache: 8MB (16MB is $249.99, with no increase in metrics) > * Form Factor: 3.5" > * Average Seek Time: 3.4ms > * Average Write Time: 3.9ms > * Average Latency: 2ms > * Model #: MBA3147NC > * Item #: N82E16822116061 > > > Although hearing you say raid5, and reduced opportunity for data loss, I > would say Large 16K/7200 SataII drives could be your best choice. (lots > of them, as in 4+ drives (((NOT 3)))) > > For more detailed info on the data transfer issue, look into the kernel > docs for FileSystem Driver, or EXT3 Drivers. > > Here is a hdparam article that sheds some like on tuning opportunities - > the real story: > http://www.linuxdevcenter.com/pub/a/linux/2000/06/29/hdparm.html > > James, > > > > On Wed, 2008-12-10 at 09:43 -0500, John McKelvey wrote: > > Folks, > > > > I want to add 3 identical hard drives under Raid 5. Am considering > > Seagate SATA II server drives. One question is does it really make > > much difference to use drives with 16Mbytes cache rather than 32Mbytes > > cache? > > > > Thanks! > > > > John McKelvey > > _______________________________________________ > > Fwlug mailing list > > [email protected] > > http://fortwaynelug.org/mailman/listinfo/fwlug_fortwaynelug.org >
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