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Reliability of fibre channel disks vs. SCSI disks?
I've been told, but find it hard to believe, that fibre channel disks are quite a bit more reliable than SCSI disks. My own limited experience with fibre channel disks is that they fail at a similar rate to SCSI disks. In the past I've used arrays that contain SCSI disks. At my new job we use mostly fibre channel. They seem to me to fail at a similar rate, but the sys admin I work with is convinced that SCSI disks fail more frequently given like circumstances ("all other things being equal"). And aren't all current fibre channel disks really SCSI disks "internally"? Can it be that the switching between these two advanced interface types changes the MTBF to a large extent? Are there any storage gurus out there that would care to share their overall experiences with respect to fibre channel vs. SCSI disk failures / MTBF / etc.? Thank you, Pete |
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Reliability of fibre channel disks vs. SCSI disks?
wrote in message
oups.com... I've been told, but find it hard to believe, that fibre channel disks are quite a bit more reliable than SCSI disks. My own limited experience with fibre channel disks is that they fail at a similar rate to SCSI disks. In the past I've used arrays that contain SCSI disks. At my new job we use mostly fibre channel. They seem to me to fail at a similar rate, but the sys admin I work with is convinced that SCSI disks fail more frequently given like circumstances ("all other things being equal"). And aren't all current fibre channel disks really SCSI disks "internally"? Can it be that the switching between these two advanced interface types changes the MTBF to a large extent? Are there any storage gurus out there that would care to share their overall experiences with respect to fibre channel vs. SCSI disk failures / MTBF / etc.? Thank you, Pete Both FC and SCSI drives from all the vendors have the same mechanical design set (for each vendor) and deliver the same reliability. Both have a design lifetime of 5 years, after which failure rate begins to increase (coming up the bathtub curve). Warranty is a commercial response to commercial and competitive pressures and is no indication of failure rate. Vendors quote between 1.2M and 1.4M hours for both classes. Joe |
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Reliability of fibre channel disks vs. SCSI disks?
On Fri, 28 Oct 2005 13:51:22 +0000 (UTC), "Joseph Fagan"
wrote: wrote in message roups.com... I've been told, but find it hard to believe, that fibre channel disks are quite a bit more reliable than SCSI disks. My own limited experience with fibre channel disks is that they fail at a similar rate to SCSI disks. In the past I've used arrays that contain SCSI disks. At my new job we use mostly fibre channel. They seem to me to fail at a similar rate, but the sys admin I work with is convinced that SCSI disks fail more frequently given like circumstances ("all other things being equal"). And aren't all current fibre channel disks really SCSI disks "internally"? Can it be that the switching between these two advanced interface types changes the MTBF to a large extent? Are there any storage gurus out there that would care to share their overall experiences with respect to fibre channel vs. SCSI disk failures / MTBF / etc.? Thank you, Pete Both FC and SCSI drives from all the vendors have the same mechanical design set (for each vendor) and deliver the same reliability. Both have a design lifetime of 5 years, after which failure rate begins to increase (coming up the bathtub curve). Warranty is a commercial response to commercial and competitive pressures and is no indication of failure rate. Vendors quote between 1.2M and 1.4M hours for both classes. Joe That is an incorrect generalization. Just look at seagate's web site, or another drive vendor site, and compare the differences in MTBF, duty cycles, error rates, tolerance for shock/vibration/temperature for a few disk drives. |
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