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Parity sync/drive rebuild speed with DS4243 Disk Shelf


drumstyx

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Running a parity check right now for the first time since loading 4 drives into my DS4243 drive shelf, and it's fairly slow -- around 45MB/s, compared with the previous average around 100-125MB/s.

Is the shelf itself something of a bottleneck? I'm using an LSI HBA, as recommended, and each individual drive is fine in terms of speed, but I'm thinking maybe the total bandwidth available from the shelf is only a few hundred MB/s? Is this to be expected? On that note, what happens when I start running 20 odd disks in this thing?

 

Ah, there we go -- rebooted and I'm seeing 108MB/s or so. Much better! I wonder why...

Edited by drumstyx
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