We have a FAS940C that has 2 trad volumes (5TB & 3TB, 144GB/FC drives) that are always around 95%+ full because of funding and timing issues. Only when we run out of space do we start deleting snapshots, otherwise there are always a few hundred GB of snapshots. We've been running over 90% for the past year and have never had an outage or major hiccup...just a few disk failures. We typically have 4k-5k active CIFS connections and around 100 NFS connections. Clients have never noticed a performance problem, and our CPU utilization hovers between 30% and 50%. So maybe we do not notice a problem because there is more than enough CPU cycles left over for DOT/WAFL to deal with the full file system.
Jeff
--- Glenn Dekhayser gdekhayser@voyantinc.com wrote:
Netapp recommends that you keep the fileysystems at 80% or less. Otherwise, WAFL starts to work very hard finding places to put data, and you'll see CPU spikes, High disk utilization, and degraded performance.
Glenn
-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Philippe Jackson Sent: Wednesday, February 22, 2006 12:09 PM To: toasters@mathworks.com Subject: maxing out the filesystem
This is my first time posting Â... I just inherited 2 older filers. 840 and 960 models
Unfortunately they didnÂ't come with nearly enough disk space for our needs.
I know I canÂ't fill the volumes to 100% and expect them to work Â... but how
high can I fill the volumes and expect it to work and performance not to sufferÂ.... Can I go to 95% if I turn off snapshots?
Any feedback or experience from filers at 95% would be appreciated Â... IÂ'm hoping to learn from other peopleÂ's mistakes this time.
Of course thereÂ's always the option of buying more disk Â... but for now I need to see what I can do with what we've been given without spending more money.
Cheers Philip
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