CFS Health Check ?
- Hi, Ken In a summary, you can use common performance tools like : top, vmstat etc to monitor CFS system performance, cpu usage, memory usage, io busy. Several suggestions: 1. use fsadm -DE
to check fragment report of file system, avoid fragmentation. 2. avoid too many small files under one directory. 3. multinode nodes write to a file system simultaeously, try to put data in different directory. More refer guide https://sort.symantec.com/public/documents/sfha/6.1/linux/productguides/html/sfcfs_admin/pt05.htm About your concern: - Suitability of our LLT links to handle intra-node communication generated by CFS ? < StarFly... Thank you for CFS best practice recommendation.
In addition, I have found...
1. Monitor LLT link utilization at the switch VLAN level using Cisco tools.
2. Very little performance degrade when CFS primary is located on an "off" node (non-writer).
3. CFS primary can be manually set after CFS is onlined (non-persistent).
# fsclustadm setprimary /mnt (sets to this node)
# fsclustadm show primary /mnt (report current primary)
4. CFS "Policy" attribute will set the primary automatically every time CFS is onlined, from a list of primaries. This is a persistent setting.
# hares -modify <CFSMount_resource> Policy NodeB NodeA
5. Found 'glmstat' command but could not locate any use cases.
6. Recommended articles:
How to set primary node for a cluster file system
http://www.symantec.com/business/support/index?page=content&id=TECH39266Moving CFS Primary when using SFCFS for fast failover (mikebounds)
https://www-secure.symantec.com/connect/forums/moving-cfs-primary-when-using-sfcfs-fast-failoverThank You,
Ken W
