On 07/21/2015 06:41 PM, Gena Makhomed wrote:
For one thing, I wonder how you use live migration with zfs,
can you please tell us?
I don't use live migration at all.
several reasons:
1) currently even suspend/resume not work reliable:
https://bugzilla.openvz.org/show_bug.cgi?id=2470
- I can't suspend and resume containers without bugs.
and as result - I also can't use it for live migration.
Valid point, we need to figure it out. What I don't understand
is how lots of users are enjoying live migration despite this bug.
Me, personally, I never came across this.
2) I see in google many bugreports about this feature:
"openvz live migration kernel panic" - so I prefer make
planned downtime of containers at the night instead
of unexpected and very painful kernel panics and
complete reboots in the middle of the working day.
(with data lost, data corruption and other "amenities")
Unlike the previous item, which is valid, this is pure FUD.
3) my current hosting provider don't allow migrating
of IP between different servers in his datacenter.
4) from technical point of view - it is possible
to do live migration using ZFS, so "live migration"
currently is only one advantage of ploop over ZFS
I wouldn't say so. If you have some real world comparison
of zfs vs ploop, feel free to share. Like density or performance
measurements, done in a controlled environment.
- but this is not something like "killer feature",
but only temporary situation. In near future this
imbalance can be fixed, if anyone really need
live migration and ZFS with OpenVZ.
(using ZFS snapshots, for example)
And, as result, in near future:
"simfs over ZFS" always better (for app hosting)
than "ext4 over ploop over ext4"
- so it will be no reasons at all to use ploop.
Also ploop is not in mainline kernel
and probably newer it will be there. (?)
Docker already contains ZFS storage driver.
I am working on a ploop graph driver for Docker.
ZFS already can be used with mainline kernel.
But OpenVZ can't.
With each new version - ZFS is better and better.
Do you imply that ploop is worse and worse with each new version?
ZFS is really "The Last Word in File Systems",
and now you can just use it for free,
without reinventing the wheel.
OpenVZ + ZFS or Virtuozzo + ZFS == atom bomb,
killer feature with horrible devastation power.
Or - you just forcing users to migrate from OpenVZ
to CentOS+KVM over ZFS and/or CentOS+Docker over ZFS.
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