AIX => Administration => Topic started by: flok on January 18, 2011, 05:21:58 PM

Title: getting AIX to act as an iSCSI target
Post by: flok on January 18, 2011, 05:21:58 PM
Is it possible for aix 6100-05-00-0000 to act as an iSCSI target?
Did some googling but couldn't find anything that works.
Title: Re: getting AIX to act as an iSCSI target
Post by: Michael on March 07, 2011, 03:52:17 PM
I read this, and my first thought was probably not - but mainly because I had never considered it.
On second thought I am thinking - why not? As it did provide target and responder interfaces for HACMP long ago over ssa and rs232.

I'll start looking into it - but I would certainly suggest looking from AIX 6.1 TL6 and beyond. I cannot say what the big difference is - but in my gut I sense a bigger jump in features and behavior changes between TL5 and TL6 that TL4 and TL5.

I do have some logic behind this though. TL6 is released nearly in parallel with AIX 7.1 - and, imho, a lot of effort was made to make the two versions functionally more similar than was the custom when a new version of AIX was released.
Title: Re: getting AIX to act as an iSCSI target
Post by: Michael on March 07, 2011, 04:05:59 PM
From the AIX 7.1 Differences redbook:
4.1.5 Firmware-assisted dump support for non-boot iSCSI device
The release of AIX Version 6.1 with the 6100-01 Technology Level introduced
support for an iSCSI device to be configured as a dump device for
firmware-assisted system dump.
The sysdumpdev command could be used to configure an iSCSI logical volume as
a dump device. In AIX V6.1, it was mandatory that this dump device be located
on an iSCSI boot device.
With the release of AIX V7.1, firmware-assisted dump also supports dump
devices located on arbitrary non-boot iSCSI disks. This allows diskless servers to
dump to remote iSCSI disks using firmware-assisted dump. The iSCSI disks
must be members of the root volume group.

So, it looks like AIX 6.1 TL06 has some changes with regard to iSCSI usage (not talking about target yet). Further, it feels like AIX 7.1 is going to support iSCSI as a logical partition type (like jfs2) - so MAYBE this is where iSCSI target support will come from.

The next system I want to look at is what the latest VIOS (2.2) is providing in terms of iSCSI support for WPAR. I seem to recall hearing something about that, or reading it. Back in October I went through a long list of new features - and wrote a short description on most of them - but that was all lost (personal notes) when someone permanently loaned my laptop. Bother.
You can check the articles I did publish here for most of those notes.