PVFS fault tolerence ?
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Ben Ransom bransom at ucdavis.eduTue Feb 5 17:50:51 PST 2002
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I see that PVFS stripes data, but it seems there is no fault tolerance. That is, a node goes down, and your data is not available. So, although IDE drives are pretty reliable, the chance of data loss from a PVFS system is essentially the chance of a single node (disk) going down times the number of nodes in the PVFS file space. Not so good. So, yeah, I buy a large capacity tape drive. But even then, do I have to look at restoring the *entire* PVFS volume, which could be very large (say 20 nodes times 30gb) just for loosing one node? Odds are, losing a disk is "when", not "if". -Ben Ransom UC Davis
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