Storage – Page 2 – Rejected I/O

NetApp C-Mode Cluster creation issues

Posted on 2015/06/162015/06/21 by nullgenome

Converting a 7-Mode 8.2.1 3220 to a C-mode switchless system seemed to be going well until I needed to add the second node. The A head is running fine with the basic configuration and when running clu... Read More

Failing Drive FreeNAS 9.3

Posted on 2015/05/132015/11/06 by nullgenome

This morning I received an email warning that one of my drives is problematic: Device: /dev/ada9, 1 Currently unreadable (pending) sectors So checking the device from the box it doesn’t look goo... Read More

Home NAS – FreeNAS

Posted on 2015/03/192015/06/21 by nullgenome

At the moment I use a 4 bay Netgear ReadyNAS NV+ v2 with four 2GB disks in their X-RAID2 setup. It’s basically RAID 5 now but it auto expands as you add disks or swap disks for larger capacity. ... Read More

Finding damaged object paths in Panasas

Posted on 2015/03/022015/06/21 by nullgenome

Sometimes the path isn’t known for a damaged file. Use the following Panasas pages here and here for more info (login required). In short: [pancli] volume damage list <vol name> Output ret... Read More

Monitoring Panasas with Opennms

Posted on 2015/02/102015/06/21 by nullgenome

System Summary The Panasas cluster version I’m using is 5.5.1-1098440.68. The Opennms version I’m using is 1.12.9 running on RHEL 6.3. I’ve installed: net-snmp-utils-5.5-41.el6.x... Read More

Hopefully back

Posted on 2014/12/022015/06/21 by nullgenome

So last couple of months have been manic, we’ve pretty much finished our data centre migrations, I went to the Elite Dangerous Premier event with my son and we’ve had an ill family! Though... Read More

NetApp Cluster mode – Converting Switchless to Switched Cluster

Posted on 2014/09/122014/09/19 by nullgenome

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

GPFS node rejects – watching the waiters

Posted on 2014/08/292015/03/03 by nullgenome

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

NetApp Performance Advisor CP logging

Posted on 2014/07/292014/07/29 by nullgenome

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

Posted on 2014/07/24 by nullgenome

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

Rejected I/O

General Geeky Meanderings

Tag: Storage