[gpfsug-discuss] Preliminary conclusion: single client, single thread, small files - native Scale vs NFS

Keigo Matsubara MKEIGO at jp.ibm.com
Wed Oct 17 14:34:55 BST 2018


I also wonder how many products actually exploit NFS async mode to improve 
I/O performance by sacrificing the file system consistency risk:

gpfsug-discuss-bounces at spectrumscale.org wrote on 2018/10/17 22:26:52:
>               Using this option usually improves performance, but at
> the cost that an unclean server restart (i.e. a crash) can cause 
> data to be lost or corrupted."

For instance, NetApp, at the very least FAS 3220 running Data OnTap 
8.1.2p4 7-mode which I tested with, would forcibly *promote* async mode to 
sync mode.
Promoting means even if NFS client requests async mount mode, the NFS 
server ignores and allows only sync mount mode.

Best Regards,
---
Keigo Matsubara, Storage Solutions Client Technical Specialist, IBM Japan
TEL: +81-50-3150-0595, T/L: 6205-0595


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