[opensuse-factory] Are snapper snapshots crash-safe?
I have just finished tuning my CPU overclocking. During the last week I had (obviously) multiple kernel oopses and hang-ups. In the meantime snapper made snapshots multiple times a day, with every applied update to the Factory software. I am sure my system died at least several times during snapshot creation. I have an HDD slow enough to have programs get stuck in "disk sleep(?)" state when snapperd kicks in. So, am I safe to use the snapshots? If not, what should I do? Delete them? -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org
On 2013-09-17 T 12:13 +0200 Marek Paśnikowski wrote:
I have just finished tuning my CPU overclocking.
I am always concerned about overclocking, as this may lead to errors everywhere and elsewhere, ... but well.
During the last week I had (obviously) multiple kernel oopses and hang-ups. In the meantime snapper made snapshots multiple times a day, with every applied update to the Factory software. I am sure my system died at least several times during snapshot creation. I have an HDD slow enough to have programs get stuck in "disk sleep(?)" state when snapperd kicks in. So, am I safe to use the snapshots? If not, what should I do? Delete them?
I suggest to tweak your snapper configuration for root to be less "impacting". Edit /etc/snapper/configs/root and have the values set as this: BACKGROUND_COMPARISON="no" # less load from snapperd TIMELINE_CREATE="no" As you are running Factory, I would in addition set: NUMBER_CLEANUP="yes" NUMBER_LIMIT="32" # keep the last 16 zypper changes only Hope this helps. so long - MgE -- Matthias G. Eckermann Senior Product Manager SUSE® Linux Enterprise SUSE LINUX Products GmbH Maxfeldstraße 5 90409 Nürnberg Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org
On Tue, Sep 17, 2013 at 7:13 AM, Marek Paśnikowski <poczta@marekpasnikowski.name> wrote:
I have just finished tuning my CPU overclocking. During the last week I had (obviously) multiple kernel oopses and hang-ups. In the meantime snapper made snapshots multiple times a day, with every applied update to the Factory software.
Nothing is crash-safe when OCing, since it's your processor the one failing. RAM bit flips will corrupt all your data as the kernel moves pages around, since memory will be lossy, a situation that cannot be salvaged easily, and while btrfs tries to address it (by doing checksums), I would still exercise caution. In general, you should never boot your machine until your OC has proved to be stable. While tweaking, limit yourself to memtest, firmware test and live DVDs. But, since you did... btrfs snapshots leverage btrfs copy-on-write, so I would expect the snapshots to be safer the older they are. But I'm no btrfs expert. -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org
participants (3)
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Claudio Freire -
Marek Paśnikowski -
Matthias G. Eckermann