I'm planning some new mysql database servers and I've had problems with LVM in the past with snapshots. I've had advice from someone from MySQL AB to try out GFS because it's snapshotting is supposed not to be broken. Looking at some of the GFS documentation on Redhat.com makes it look like GFS might be or might not be a simple replacement if I'm just mounting it locally, but I've never tried it out. On the other hand, I've seen posts saying that if I do something like a rpm rebuild of LVM and udev and somesuch LVM snapshotting should work.
I'd prefer to run a server configuration where I could do a scripted server build without having to install GCC and rebuild RPM packages when it came time to do a reinstall or create another replica server.
Is LVM snapshotting going to busted forever, and should I go for GFS locally mounted?
Jed
Jed Reynolds wrote:
Is LVM snapshotting going to busted forever, and should I go for GFS locally mounted?
you seem to be talking about a time long long back, lvm snapshoting has been working fine for me since 4.3 days ( and has mostly worked fine on C-3 anyway )
when was the last time you actually *used* it ?
Karanbir Singh wrote:
Jed Reynolds wrote:
Is LVM snapshotting going to busted forever, and should I go for GFS locally mounted?
you seem to be talking about a time long long back, lvm snapshoting has been working fine for me since 4.3 days ( and has mostly worked fine on C-3 anyway )
when was the last time you actually *used* it ?
Snapshots most assuredly does NOT work when you have the cluster LVM enabled. Here's a quick example:
[root@cobalt ~]# lvcreate --snapshot --size 1G --name compaq-snap /dev/software/compaq Clustered snapshots are not yet supported. [root@cobalt ~]#
At the Red Hat summit back in the summer I spoke with a lot of the cluster developers, this is something that is apparently a pretty hot deliverable for them. I know I sure want it back, but I haven't heard anything about when it will be available on a clustered system.
My $.02
Jay Leafey wrote:
you seem to be talking about a time long long back, lvm snapshoting has been working fine for me since 4.3 days ( and has mostly worked fine on C-3 anyway )
when was the last time you actually *used* it ?
Snapshots most assuredly does NOT work when you have the cluster LVM enabled. Here's a quick example:
right, you didnt mention Clustered LVM :) I dont use that...
- KB
Karanbir Singh wrote:
Jed Reynolds wrote:
Is LVM snapshotting going to busted forever, and should I go for GFS locally mounted?
you seem to be talking about a time long long back, lvm snapshoting has been working fine for me since 4.3 days ( and has mostly worked fine on C-3 anyway )
when was the last time you actually *used* it ?
Centos 4.0 and 4.1 both froze up the machines I used snapshotting on.
If it's working for you in 4.3, I'll test it out again. Thanks.
Jed
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Jay Leafey -
Jed Reynolds -
Karanbir Singh