I can''t reproduce this right know, but it seems that creating lots of
snapshots, one per minute (keeping only a dozens of them) may block the
system. Every btrfs snap processes stay idle and the load skyrockets to 900.
I use an old version: 2.6.34.5 kernel, and the system is still very
responsive (web and mysql server).
I would apreciate if somebody could tell me about the current kernel (I
had stability issues with 2.6.35 series).
# btrfs filesys show
Label: ''btrfs'' uuid: e13357f4-c40c-4940-87bd-4f5142d32c49
Total devices 2 FS bytes used 8.67GB
devid 1 size 1.81TB used 12.03GB path /dev/sda2
devid 2 size 1.81TB used 12.01GB path /dev/sdb2
# btrfs filesys df /var
Data, RAID1: total=11.00GB, used=8.24GB
Metadata, RAID1: total=1.00GB, used=436.21MB
System, RAID1: total=8.00MB, used=4.00KB
Data: total=8.00MB, used=0.00
Metadata: total=8.00MB, used=0.00
System: total=4.00MB, used=0.00
Regards,
PS: extract from dmesg if somebody is interested.
http://pastebin.com/8zE4GKXu
--
Xavier Nicollet
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On Tue, 26 Oct 2010 12:28:53 +0200 Xavier Nicollet <nicollet@jeru.org> wrote:> I can''t reproduce this right know, but it seems that creating lots of > snapshots, one per minute (keeping only a dozens of them) may block > the system. Every btrfs snap processes stay idle and the load > skyrockets to 900. > > I use an old version: 2.6.34.5 kernel, and the system is still very > responsive (web and mysql server).I had the same thing happen with a 2.6.36-rc6 kernel on my laptop. My cron jobs were creating snapshots and 5 minute intervals and keeping 12 of them active. I turned off the 5-minute snapshots and I''m now just keeping 4 weekly, 7 daily, and 24 hourly snapshots alive. Pat -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Le 26 octobre 2010 à 15:15, Pat Regan a écrit:> I turned off the 5-minute snapshots and I''m now just keeping 4 weekly, 7 > daily, and 24 hourly snapshots alive.I have just rebooted and I am going with /15 minutes interval. -- Xavier Nicollet -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, 27 Oct 2010 10:39:48 +0200 Xavier Nicollet <nicollet@jeru.org> wrote:> Le 26 octobre 2010 à 15:15, Pat Regan a écrit: > > I turned off the 5-minute snapshots and I''m now just keeping 4 > > weekly, 7 daily, and 24 hourly snapshots alive. > > I have just rebooted and I am going with /15 minutes interval. >I''m just replying so this is documented somewhere. After I read your message I decided to turn on snaphots at 15 minute intervals yesterday. This morning I had snapshot processing filling up my process list again. My laptop is a quad core i7 and the btrfs file system is on an Intel X25-M 80 gig. I don''t know if a fast drives increases or decreases the likelihood of having this problem or not. Pat -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, Oct 29, 2010 at 00:03, Pat Regan <thehead@patshead.com> wrote:> On Wed, 27 Oct 2010 10:39:48 +0200 > Xavier Nicollet <nicollet@jeru.org> wrote: > >> Le 26 octobre 2010 à 15:15, Pat Regan a écrit: >> > I turned off the 5-minute snapshots and I''m now just keeping 4 >> > weekly, 7 daily, and 24 hourly snapshots alive. >> >> I have just rebooted and I am going with /15 minutes interval. >> > > I''m just replying so this is documented somewhere. > > After I read your message I decided to turn on snaphots at 15 minute > intervals yesterday. This morning I had snapshot processing filling up > my process list again.I think there is no problem with snapshot creation every 5 or 15 minutes, but problem is with deleting old snapshots every 5 or 15 minutes. Can you try to run cleanup of old snapshots only once per day to check if it will improve?> > My laptop is a quad core i7 and the btrfs file system is on an Intel > X25-M 80 gig. I don''t know if a fast drives increases or decreases the > likelihood of having this problem or not. > > Pat >-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Fri, 29 Oct 2010 08:31:05 +0200 Roman Kapusta <roman.kapusta@gmail.com> wrote:> On Fri, Oct 29, 2010 at 00:03, Pat Regan <thehead@patshead.com> wrote: > > On Wed, 27 Oct 2010 10:39:48 +0200 > > Xavier Nicollet <nicollet@jeru.org> wrote: > > > >> Le 26 octobre 2010 à 15:15, Pat Regan a écrit: > >> > I turned off the 5-minute snapshots and I''m now just keeping 4 > >> > weekly, 7 daily, and 24 hourly snapshots alive. > >> > >> I have just rebooted and I am going with /15 minutes interval. > >> > > > > I''m just replying so this is documented somewhere. > > > > After I read your message I decided to turn on snaphots at 15 minute > > intervals yesterday. This morning I had snapshot processing > > filling up my process list again. > > I think there is no problem with snapshot creation every 5 or 15 > minutes, but problem is with deleting old snapshots every 5 or 15 > minutes. Can you try to run cleanup of old snapshots only once per day > to check if it will improve?Reducing the frequency of snapshot removal sure did work. I started with a pretty large amount of time between snapshot removal jobs and I have been decreasing that number. I have been running with a 1 hour delay between snapshot removals for almost 24 hours so far with no problems. Pat -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html