281 reputation
15
bio website peterson-tech.com/~jlp
location Utah
age 49
visits member for 3 years, 1 month
seen Nov 4 '13 at 21:36

I'm a senior systems administrator with 20+ years of experience with various Unix and Unix-like systems. I'm currently working for Fusion-io as an EDA Developer (sysadmin, toolsmith) for the Logic team.


Sep
15
comment How large is my ZFS dedupe table at the moment?
constantin.glez.de/blog/2011/07/zfs-dedupe-or-not-dedupe has some good information on calculating your expected wins from dedup and your expected costs.
May
14
answered Proxmox 2.3 don't use mount script
Feb
13
answered Is it possible to access the ZFS checksums to compare files
Feb
1
answered kvm -monitor pty : how to find out the associated /dev/pts/#num
Jan
10
revised Proxmox - Uploading disk image
incorporated additional text from a comment into the answer
Oct
29
answered Does the OSS Backup Solution amanda.org support sparse files?
Oct
24
revised Proxmox - Uploading disk image
added additional information as my initial info didn't really solve the problem.
Oct
24
comment Proxmox - Uploading disk image
Hmmm, mine says the same. I think you can scp the file up. You probably want to look at /var/lib/vz/images/{VMID}/ for the destination. Then maybe look at /etc/pve/qemu-server/{VMID}.conf and add a line for the storage.
Oct
23
answered Proxmox - Uploading disk image
Jul
28
awarded  Yearling
Jul
13
answered is it possible to load virtual machine to memory like that of a live cd
Jun
29
comment Backup storage server with ZFS
I was one of those that got bit by the attractiveness of ZFS deduplication. Everything was working great in our test environment. We turned it on in production. Everything was fine and smooth, getting 2+ times deduplication ratio. Beautiful. We started moving users over to the new system. No problems until, one day, we moved a user and performance of the file server tanked. Suddenly the machine was on it's knees. A crash and subsequent reboot took over 90 minutes before the machine came back up as it processed the dedup tables. Terrible. We got rid of dedup. I advise staying away from it.
Jun
29
answered Nexenta, NFS and LOCK_EX
Jun
27
awarded  Editor
May
7
awarded  Commentator
May
7
comment ZFS: RAIDZ versus stripe with ditto blocks
You mentioned dedup in the subject line... just FYI, dedup doesn't play nicely with snapshots. I'd recommend against using dedup unless you really know a lot about your data and how you're going to be using it.
Mar
20
comment Vzctl takes 100% CPU usage
You might want to figure out what vzctl and qmgr are doing... try attaching to them with, e.g., strace -p PID (you can interrupt the strace with ctrl-C). strace will show you what system calls are being executed by the process... depending on what they are, you may find that they are both trying to do something with the same file or they're both busy waiting for something. lsof is another utility that can help you since strace will show the FID of any file that is being accessed. lsof will tell you how that FID relates to a specific file in the filesystem.
Mar
17
answered How to share one physical hard-disk to multiple KVM guest in a Proxmox VE?
Dec
19
comment virsh slow execution
I did find this: devco.net/archives/2007/12/05/…
Dec
19
comment virsh slow execution
Took a quick look and I don't see any obvious pauses. There are a lot of lock and unlock operations on /var/lib/xenstored/tdb*, which I suppose are expected. Perhaps there is some underlying filesystem issue on the dom0 wher e/var/lib/xenstored is mounted? You might also try "xenstore-control check" to check the integrity of the DB. I'm pretty much out of ideas at this point.