On 2005-10-27T19:33:22-0400, Gene Heskett wrote: > Our first foray into using a scsi based commercial server resulted in > its getting converted to ata disks fairly rapidly as the scsi raid > lost a drive at 2 week intervals. A single big atapi/eide drive > turned out to be faster, and a heck of a lot more reliable.
While I feel for you, it's not a good idea to make decisions based on a single installation. If you have disks dying every 2 weeks, something else was up. Heat would be my first guess. Seagate, I think, had a batch of bad SCSI drives recently. Sign up for an account on http://www.storagereview.com/ and check out the reliability survey. I have good luck with IBM (2 GB) and Fujitsu (32 GB) SCSI drives, and had a Quantum (9 GB) die on me. > Ditto here at home, I gave up on scsi tape drives about 18 months ago and > bought a 200GB atapi/eide drive & setup amanda's virtual tapes on it. It > has so far, been about 100x more dependable than the scsi tape ever was. The interface is probably the most reliable thing on a tape drive. Are you comparing the same drive, same brand but just different interfaces? > Now we've gotten into the video server scene, again with the recommended > terrabyte raid, scsi3-320 or some such based with a 1394B (800 > megabits/second=100 megabytes) interface to the servers, and again scsi is > being a problem child with an occasional stutter while playing and always > a missed first word as it starts. 1394B -- array --> scsi --> disk? How many disks? Just curious. I could not get 1394 to work with Linux, and has to use USB for an external disk for the enclosure that I picked up after much resarch. > Put the same program file on a single internal big atapi/eide drive > and the performance is 100% reading while writing so we put in 2 > drives per server. If it works for you good, great, it's a cheaper solution. If you starting pounding if with multiple users, it may not such a good solution and you may need more than one spindle to handle the load. I read one of the postgresql lists that IDE drives apparently claim sync data immediately while SCSI drives are truthful. That makes a difference when you are concerned about data transactional data. > able to find an rsync workalike that does both branches of the apple > filesystem so that we can fabricate a darned near realtime, live, > online, redundant backup in case one server chassis should upchuck > in the middle of a program playback. > > If anyone has a clue how we can simulate an rsync run between 2 dual g5 > servers at 5 minute intervals, we're all ears. Suggest you start a new thread on this. /Allan
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