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It should be one second, not 1.0737418 seconds.Ĭomputer people knew what kilobyte meant.
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I shouldn't have to pull out a freaking calculator to figure out how long it should take to dump 2 GB of RAM across a 2 GB/s link. This allows for a maximum transfer rate of 533 MB/sec across a 64-bit PCI bus.Ħ6 2/3 MHz (M here means what? oh, right, 10^6) times 8 bytes is 533 1/3 MB/s. Under standard PCI the host bus has a maximum speed of 66 MHz. Warning! These drives apparently have quality control problemsĪnd I do not recommend purchasing them at this time. As of this writing only IBM DPTA and DTLA drives support theįeature. This brings SCSI tagging features to IDEĭrives. Hw.ata.tags (you also set this in the boot loader) which allows writeĬaching to be safely turned on. There is a new experimental feature for IDE hard drives called More information on tuning the ATAĭriver system may be found in the ata(4) man page. If IDE write caching is turned off, you can turn it back on by setting The default on your system by observing the hw.ata.wc sysctl variable. Nately, the result was such a huge loss in performance that we caved inĪnd changed the default back to on after the release. A crash or power failure can result in seriousįile system corruption. Out of order, they will sometimes delay some of the blocks indefinitely Write caching turned on, IDE hard drives will not only write data to disk Problem is that IDE drives lie about when a write completes. Write bandwidth to IDE disks but was considered necessary due to seriousĭata consistency issues introduced by hard drive vendors. Please see fcntl(2) for more detail.įreeBSD 4.3 flirted with turning off IDE write caching. Should use F_FULLFSYNC to ensure their data is written in the order theyĮxpect. The F_FULLFSYNCįcntl asks the drive to flush all buffered data to permanent storage.Īpplications such as databases that require a strict ordering of writes Their data, MacOS X provides the F_FULLFSYNC fcntl. With real world workloads and drive power failures.įor applications that require tighter guarantess about the integrity of The diskĭrive may also re-order the data so that later writes may be present May find that only some or none of their data was written. Specifically, if the drive loses power or the OS crashes, the application the "permanent storage device"), the drive itself may not physi-Ĭally write the data to the platters for quite some time and it may be Note that while fsync() will flush all data from the host to the drive
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This normally results in all in-core modifiedĬopies of buffers for the associated file to be written to a disk. Fsync() causes all modified data and attributes of fd to be moved to a