“Because you can…”

January 21, 2007 at 4:21 pm Leave a comment

Sorry for not publishing anything for a bit! Let’s get active again…

Last week’s LOSUG meeting demonstrated a neat, albeit probably non-useful, trick.

They were showing the new iSCSI initiator (i.e. server) code in OpenSolaris, which works with the latest iSCSI target (i.e. client) code in Windows. So they created a 100MB disk for iSCSI from a backing file, connected to it from Windows, formatted it there as FAT, wrote to it, etc etc.

It all Just Worked. The new iSCSI admin tools look easy to use, and were modelled a bit on the ZFS tools.

Anyway then Frank, one of the filesystem guys, went and found the backing file on the Solaris laptop, took a quick look at it with mdb and then mounted it over loopback on Solaris! I think he tricked lofiadm into starting at some offset into the file, as there’s presumably some sort of header at the start of the backing file.

To prove it wasn’t a cheat, he edited a file on it using vi. Switched over to Windows, did the equivalent of disabling and reenabling the disk, and voila the edits were there on Windows.

It’d be fun to set up a ZFS pool from a backing file stored on an iSCSI-attached disk, and then mount a filesystem from that pool back on the iSCSI target. Fun, but sick!

Advertisements

Entry filed under: OpenSolaris.

Why no ZFS? Patching

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Trackback this post  |  Subscribe to the comments via RSS Feed


January 2007
M T W T F S S
« Dec   Feb »
1234567
891011121314
15161718192021
22232425262728
293031  

OpenSolaris

access(2) OpenSolaris

%d bloggers like this: