Answers inline below as well ☺ Hope this helps.
James Burnash, Unix Engineering From: [email protected] [mailto:[email protected]] On Behalf Of Nyamul Hassan Sent: Wednesday, May 11, 2011 10:04 AM To: [email protected] Subject: Re: [Gluster-users] [SPAM?] Storage Design Overview Thank you for the prompt and insightful answer, James. My remarks are inline. 1. Can we mount a GlusterFS on a client and expect it to provide sustained throughput near wirespeed? <No> In your scenario, what were the maximum read speeds that you observed? Read (using dd) approximately 60MB/sec to 100MB/sec. 3. Does it put extra pressure on the client? <What do you mean by pressure? My clients (HP ProLiant DL360 G5 Quad Core with 32GB RAM) show up to 2GB of memory usage when the native Gluster client is used for mounts – but that is dependent on what you set the client cache max for – in my case, 2GB. CPU utilization is usually negligible in my systems, network bandwidth utilization and I/O throughput … depend on what the files sizes and access patterns look like> Thx for the insight. Can you describe your current deployment a bit more, like configs of the storage nodes, and the client nodes, and what type of application you are using it for? Don't want to be too intrusive, just to get an idea on what others are doing. All on Gluster 3.1.3 Servers: 4 CentOS 5.5 (ProLiant DL370 G6 servers, Intel Xeon 3200 MHz), Each with: Single P812 Smart Array Controller, Single MDS600 with 70 2TB SATA drives configured as RAID 50 48 MB RAM Clients: 185 CentOS 5.2 (mostly DL360 G6). /pfs2 is the mount point for a Duplicated-Replicate volume of 4 servers. Volume Name: pfs-ro1 Type: Distributed-Replicate Status: Started Number of Bricks: 20 x 2 = 40 Transport-type: tcp Bricks: Brick1: jc1letgfs17-pfs1:/export/read-only/g01 Brick2: jc1letgfs18-pfs1:/export/read-only/g01 Brick3: jc1letgfs17-pfs1:/export/read-only/g02 Brick4: jc1letgfs18-pfs1:/export/read-only/g02 Brick5: jc1letgfs17-pfs1:/export/read-only/g03 Brick6: jc1letgfs18-pfs1:/export/read-only/g03 Brick7: jc1letgfs17-pfs1:/export/read-only/g04 Brick8: jc1letgfs18-pfs1:/export/read-only/g04 Brick9: jc1letgfs17-pfs1:/export/read-only/g05 Brick10: jc1letgfs18-pfs1:/export/read-only/g05 Brick11: jc1letgfs17-pfs1:/export/read-only/g06 Brick12: jc1letgfs18-pfs1:/export/read-only/g06 Brick13: jc1letgfs17-pfs1:/export/read-only/g07 Brick14: jc1letgfs18-pfs1:/export/read-only/g07 Brick15: jc1letgfs17-pfs1:/export/read-only/g08 Brick16: jc1letgfs18-pfs1:/export/read-only/g08 Brick17: jc1letgfs17-pfs1:/export/read-only/g09 Brick18: jc1letgfs18-pfs1:/export/read-only/g09 Brick19: jc1letgfs17-pfs1:/export/read-only/g10 Brick20: jc1letgfs18-pfs1:/export/read-only/g10 Brick21: jc1letgfs14-pfs1:/export/read-only/g01 Brick22: jc1letgfs15-pfs1:/export/read-only/g01 Brick23: jc1letgfs14-pfs1:/export/read-only/g02 Brick24: jc1letgfs15-pfs1:/export/read-only/g02 Brick25: jc1letgfs14-pfs1:/export/read-only/g03 Brick26: jc1letgfs15-pfs1:/export/read-only/g03 Brick27: jc1letgfs14-pfs1:/export/read-only/g04 Brick28: jc1letgfs15-pfs1:/export/read-only/g04 Brick29: jc1letgfs14-pfs1:/export/read-only/g05 Brick30: jc1letgfs15-pfs1:/export/read-only/g05 Brick11: jc1letgfs17-pfs1:/export/read-only/g06 Brick12: jc1letgfs18-pfs1:/export/read-only/g06 Brick13: jc1letgfs17-pfs1:/export/read-only/g07 Brick14: jc1letgfs18-pfs1:/export/read-only/g07 Brick15: jc1letgfs17-pfs1:/export/read-only/g08 Brick16: jc1letgfs18-pfs1:/export/read-only/g08 Brick17: jc1letgfs17-pfs1:/export/read-only/g09 Brick18: jc1letgfs18-pfs1:/export/read-only/g09 Brick19: jc1letgfs17-pfs1:/export/read-only/g10 Brick20: jc1letgfs18-pfs1:/export/read-only/g10 Brick21: jc1letgfs14-pfs1:/export/read-only/g01 Brick22: jc1letgfs15-pfs1:/export/read-only/g01 Brick23: jc1letgfs14-pfs1:/export/read-only/g02 Brick24: jc1letgfs15-pfs1:/export/read-only/g02 Brick25: jc1letgfs14-pfs1:/export/read-only/g03 Brick26: jc1letgfs15-pfs1:/export/read-only/g03 Brick27: jc1letgfs14-pfs1:/export/read-only/g04 Brick28: jc1letgfs15-pfs1:/export/read-only/g04 Brick29: jc1letgfs14-pfs1:/export/read-only/g05 Brick30: jc1letgfs15-pfs1:/export/read-only/g05 Brick31: jc1letgfs14-pfs1:/export/read-only/g06 Brick32: jc1letgfs15-pfs1:/export/read-only/g06 Brick33: jc1letgfs14-pfs1:/export/read-only/g07 Brick34: jc1letgfs15-pfs1:/export/read-only/g07 Brick35: jc1letgfs14-pfs1:/export/read-only/g08 Brick36: jc1letgfs15-pfs1:/export/read-only/g08 Brick37: jc1letgfs14-pfs1:/export/read-only/g09 Brick38: jc1letgfs15-pfs1:/export/read-only/g09 Brick39: jc1letgfs14-pfs1:/export/read-only/g10 Brick40: jc1letgfs15-pfs1:/export/read-only/g10 Options Reconfigured: diagnostics.brick-log-level: ERROR cluster.metadata-change-log: on diagnostics.client-log-level: ERROR performance.stat-prefetch: on performance.cache-size: 2GB network.ping-timeout: 10 Thank you once again for your remarks. Cheers, HASSAN DISCLAIMER: This e-mail, and any attachments thereto, is intended only for use by the addressee(s)named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail and any attachments thereto, is strictly prohibited. If you have received this in error, please immediately notify me and permanently delete the original and any printout thereof. E-mail transmission cannot be guaranteed to be secure or error-free. The sender therefore does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. NOTICE REGARDING PRIVACY AND CONFIDENTIALITY Knight Capital Group may, at its discretion, monitor and review the content of all e-mail communications. http://www.knight.com<http://www.knight.com/>
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