Monthly Archives: July 2008

More on AuFS

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I tried to get AuFS working again, and finally got it running.
It looks like after each reboot I need to run #insmod /lib/modiules/2.6.25.5-1.1-xen/kernel/fs/aufs.ko
This loads the aufs mofule into the kernel?

Without it each #mount command responded with “aufs is not a known fs type” (or something like that.

NFS and XEN

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It seems that running a NFS client in one of the DomU (guest OSs) results in VERY poor read/write performance.
So I’ve had to run everything over a Samba connection.
Not the prettiest solution, but I get normal read/write speeds.

This is weird, cuz this worked just fine in Suse10.3… Or did it… I never tested it, but I also never had any reason to suspect it as not working, since speeds were very decent.

pictures of baby (ideas)

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– On the large highway (devoid of cars) have baby be sitting on a little put car. The view encompases the great emptyness as well as the baby + toy.
– Baby in the tub. With a red wash cloth draped on her back like a cape… The shot is from behind, and the caption reads “even surepheroes need to bathe”
DONE
– Baby bathing in the kitchen sink. Two sinks. One sink has baby, the other a towering mound of unwashed pots and pans.
– Baby drawing in chock on the sidewalk E=MC2. Picture of her working away at the 2.

Deciding how to best backup my data

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Now that I’m implementing AuFS along with FlexRAID, I am debating on how to best make use of these technologies.
The way I see it, data will fall into one of these 3 categories:
– Data that is in a Raid set as well as mirrored to another drive
– Data that is in a Raid set
– Data that I don’t mind loosing. (not part of a Raid set or mirrored)

I just need to decide what data falls into what category.

IO Performance test for AuFS

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Bonnie++ results from running on one of the 250gig drives.

Version 1.01d ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
xen-steel 8G 71543 63 73234 14 33611 3 73275 65 78241 0 185.4 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 346 0 +++++ +++ 302 0 343 0 +++++ +++ 265 0
xen-steel,8G,71543,63,73234,14,33611,3,73275,65,78241,0,185.4,0,16,346,0,+++++,+++,302,0,343,0,+++++,+++,265,0

Bonnie++ results from running on the aufs mount.
Version 1.01d ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
xen-steel 11G 67460 60 57827 13 26490 5 57663 40 60691 2 186.2 0
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 372 0 +++++ +++ 294 0 363 0 +++++ +++ 220 0
xen-steel,11G,67460,60,57827,13,26490,5,57663,40,60691,2,186.2,0,16,372,0,+++++,+++,294,0,363,0,+++++,+++,220,0

Not much difference…

Server OS upgrade?

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Should I upgrade from OpenSuSE 10.3 to OpenSuSE 11.0?
Pros:
– Update AuFS (so I don’t have to compile from source)
– Possible XEN improvements (since suse11.0 user xen 3.2)
– Setup everything with Webmin to make it easily manageable from one place.

Cons:
– Takes time
– Unknown how long it will take to set up all VM’s again.
–

Moving away from Raid5

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Move contents of Jess’s 500gig (206gigs in content) drive to my old USB enclosure drive of 250 gigs (233 gigs usable)

Move all my RAID 5 content (553gigs) to Jess’s 500gig drive (452gig usable) and my old 160gig drive (about 140gig usable)

Then I can play with taking the raid set off line, and re-formatting the 4 drives and then copy the data back to the drives. I will deal with AuFS and FlexRAID after.

FS merger found.

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Found exactly what I was looking for here.

The driver combines a several mount points into the single one

Actually I think this may actually be better then the Drive Extender things…

Ther’s also UnionFS and AuFS

Played with AuFS a little, and got it working on the laptop.
This is the mount command that worked:
#mount -t aufs -o dirs=/home/outsider:/tmp=ro none /mnt/aufs

Just need to get it working on the server now.