Two observations i made now that my Linode is running XEN instead of UML for the last 5 days:

1) CPU usage is down to 10%-20% what it as before the migration.

2) Disk IO is up almost 10-fold (yes, almost 10x more than before the migration). The IO rate used to around 3, now it's in the mid to high twenties.


I'm not too worried about (1) but is (2) expected ?

I don't know the details, but UML and Xen count I/O differently. Some increase is definitely to be expected, but I dunno if 10-fold is normal.

My Atlanta Linode is used as a MySQL replication slave for backup purposes, so I don't interact with it too much, but I also observed (without any hard numbers, so it's hard to be sure) that disk I/O appears to be pretty sluggish.

It takes several seconds between typing "mysql" and getting the prompt, for example, which I don't think it did before.

i'm not observing any performance issues, the Linode still responds fine and the site/service i'm running is not (noticeably) slower.

I was just wondering about the graph/numbers...

Okay, that's good news. It may well be that my database has grown so that's just how long it takes.