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NetApp internals – how to add SSH keys without C$ nor NFS shares

This post will describe the process of placing SSH keys using the internal ‘systemshell’ command of NetApp. As always – when doing something which the vendor did not intend you to do, do it very carefully. This data was obtained from NetApp forums, and while I do not have the original post to link (I usually link to the original, as a courtesy to the original author), this is the content, as is.
First, set to advanced mode:
filer> priv set advanced

Windows 7 hammering dnsmasq

I migrated to dnsmasq just yesterday, and discovered that a Windows 7 machine was hammering the server with messages like this:
Feb  1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPINFORM(eth0) 192.168.1.77 91:de:87:7b:e5:a8
Feb  1 11:06:07 dns dnsmasq-dhcp[1078]: DHCPACK(eth0) 192.168.1.77 91:de:87:7b:e5:a8 winpc

XenServer and its damn too small system disks

I love XenServer. I love the product, I believe it to be a very good answer for SMBs, and enterprises. It lacks on external support, true, but the price tag for many of the ‘external capabilities’ on VMware, for instance, are very high, so many SMBs, especially, learn to live without them. XenServer gives a nice pack of features, at a very reasonable price.

Extracting/Recreating RHEL/Centos6 initrd.img and install.img

A quick note about extracting and recreating RHEL6 or Centos6 (and their derivations) installation media components:
Initrd:
Extract:
mv initrd.img /tmp/initrd.img.xz
cd /tmp
xz –format=lzma initrd.img.xz –decompress
mkdir initrd
cd initrd
cpio -ivdum < ../initrd.img

Attach multiple Oracle ASM snapshots to the same host

The goal – connecting multiple Oracle ASM snapshots (same source LUNs, of course) to the same machine. The next process will demonstrate how to do it.

XenServer – increase LVM over iSCSI LUN size – online

The following procedure was tested by me, and was found to be working. The version of the XenServer I am using in this particular case is 6.1, however, I belive that this method is generic enough so that it could work for every version of XS, assuming you're using iSCSI and LVM (aka - not NetApp, CSLG, NFS and the likes). It might act as a general guideline for fiber channel communication, but this was not tested by me, and thus - I have no idea how it will work.

BackupExec 2012 (14) on newer Linux

In particular – Oracle UEK, which “claims” to be 2.6.39-xxx, but is actually 3.0.x with a lower version number. Several misbehaviors (or differences) of version 3 can be found. One of them is related to BackupExec. The service would not start on OEL6 with UEK kernels. The cause of it is an incorrect use of a function – getIfAddrs. Everything can be seen in this amazing post.

NetApp “Broken disk label”

When using ‘disk show -v’ on a NetApp filer version 7.3.x, following replacement or addition of disk(s), you might see the above mentioned message. It is caused by incorrect disk label – of OnTap version 8, on an OnTap version 7.3.x system. The system cannot handle the incorrect label, and thus – ignores the disk.

SABnzbd and high CPU usage on weak CPUs

SABnzbd is a nice tool. I just replaced my previous nzbget with it, due to its better handling of the obfuscated names in usenet groups. However, on an Atom CPU, the max download speeds did not go over ~5MB/s on a 100Mb/s link. This is rather sad, because nzbget did get the whole ~11MB/s speeds.

XenServer 6.2 is now Open Source!

It is an amazing news to me. I really love XenServer. I think that Citrix were able to make a good use of Linux mechanisms for the purposes of virtualization, without abusing the OS layer (like some of the other virtualization solutions did). The file locations are decent (for example – most parts are located in /opt, which is the right place for it to be at), and in general, it always felt to me as if Citrix developers (and the original XenSource developers) had respect for the OS. I liked it, and still do.

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