Slow Write Speed on ESXi host

Posted by Gregg Leventhal on Server Fault See other posts from Server Fault or by Gregg Leventhal
Published on 2013-11-01T21:14:17Z Indexed on 2013/11/01 21:56 UTC
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Performance

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raid

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vmware-esx

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disk

I have an ESXi 5.0 free host with an internal datastore of 7.2K 5 disk RAID 5 using a PERC 710 mini RAID controller in a Dell Poweredge R620 Server with 32GB Ram and a 12 Core Xeon. I seem to get slow write speeds in the guests so I checked out ESXTOP and I see 15MB/s write speed there on this host, which is comprable to the guests. What could be causing such horrible write speeds? Is RAID 5 really this slow to write??

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