On Thu, Feb 18, 2010 at 1:19 AM, Julius Roberts <hooliowobb...@gmail.com>wrote:
> Yes snv_79a is old, yes we're working separately on migrating to > snv_111b or later. But i need to solve this problem ASAP to buy me > some more time for that implementation. > > We pull data from a variety of sources onto our zpool called Backups, > then we snapshot them. We keep around 20 or so and then delete them > automatically. We've been doing this for around two years on this > system and it's been absolutely fantastic. Free-space hovers around > 300G. But suddenly something has changed: > > r...@darling(/)$:zfs list | head -1 && zfs list | tail -7 > NAME > USED AVAIL REFER MOUNTPOINT > Backups/natoffice/ons...@20091231_2347_triggeredby_20091231_2330 > 30.1G - 287G - > Backups/natoffice/ons...@20100131_2349_triggeredby_20100131_2330 > 17.7G - 287G - > Backups/natoffice/ons...@20100205_0001_triggeredby_20100204_2330 > 15.9G - 287G - > Backups/natoffice/ons...@20100212_0424_triggeredby_20100211_2330 > 152G - 285G - > Backups/natoffice/ons...@20100216_0430_triggeredby_20100215_2330 > 154G - 287G - > Backups/natoffice/ons...@20100217_0431_triggeredby_20100216_2330 > 154G - 287G - > Backups/natoffice/ons...@20100218_0423_triggeredby_20100217_2330 > 0 - 287G - > > Normally a snapshot shows USED around 15G to 30G. But suddenly, > snapshots of the same filesystem are showing USED ~150G. There are no > corresponding increases in any of the machines we copy data from, nor > has any of that data changed significantly. You can see that the > REFER hasn't changed much at all, this is normal. So we're backing up > the same amount of data, but it now occupies so much more on disk. > That of course means we can't keep nearly as many snapshots, and that > makes us all very nervous. > > Any ideas? > Is it possible that your users are now deleting everything before starting to write the backup data ? -- Giovanni Tirloni sysdroid.com
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