Category: IT
Digital Ocean Droplet Kernel Update
I upgraded my Ubuntu droplet to version 14 however my kernel version was still running 3.11.0-12-generic instead of 3.13.0-34-generic. Thinking that maybe the GRUB update didn’t work in the up... Read More
NetApp Cluster mode – Converting Switchless to Switched Cluster
Source NetApp document is here. port = physical interface interface = logical interface (LIF) Simple steps: Log in to the cluster’s first node/vserver via it’s RLM ssh admin@<node1&... Read More
Dovecot Postfix SSL authentication failure
I run a Dovecot/Postfix mailserver using virtual users based on a directory structure rather than a MySQL database as I only have a few users. Recently for some reason I could no longer send emails wh... Read More
GPFS node rejects – watching the waiters
Update! So we believe our rejects have been resolved. Colleagues led the investigation which basically consisted of watching the waiters on the storage cluster side, noting which client was listed in ... Read More
Monitoring Interface errors – Linux & Zabbix
Initially I created a simple script that took the stats from netstat -i every minute and manipulated them so that it left a file per interface per error counter with two figures: the total number of e... Read More
NetApp Performance Advisor CP logging
Looking at Netapp’s sysstat -x 1 (or u if your screen isn’t wide enough) output live during an issue can be invaluable troubleshooting information, particularly the CP, or consistency poi... Read More
GPFS node rejects
Recently our new(ish) GPFS cluster has been used more and more by people at work. We’ve seen network throughput of up to 200Gb/s across our storage nodes which is seriously impressive. I’m... Read More
NetApp – removing NFS locks
Ssh to the filer and enter in advanced mode: priv set advanced Get a list of locks arranged by file via the command: lock status -f Note that this can be run on a vfiler also: vfiler run <vfiler na... Read More
Bash and mutt
So trying to write a bash script that uses mutt to send various emails. So the following works with no attachment: cat $email_body | /usr/bin/mutt -s "$msg_subject" $rcpt However when I try to attach ... Read More- 4 of 4
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