[gpfsug-discuss] Metadata compression

Oesterlin, Robert Robert.Oesterlin at nuance.com
Mon Aug 17 13:50:17 BST 2015


Anyone have any practical experience here, especially using Flash, compressing GPFS metadata? IBM points out that they specifically DON’T support it on there devices (SVC/V9000/StoreWize)

Spectrum Scale FAQ: https://www-01.ibm.com/support/knowledgecenter/SSFKCN/com.ibm.cluster.gpfs.doc/gpfs_faqs/gpfsclustersfaq.html?lang=en (look for the word compressed)

But – I could not find any blanket statements that it’s not supported outright. They don’t mention anything about data, and since the default for GPFS is mixing data and metadata on the same LUNs you’re more than likely compressing  the metadata as well. :-) Also, no statements that you must split metadata from data when using compression.

Bob Oesterlin
Nuance Communications
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