Date: Tue, 22 Oct 2013 14:42:59 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Vitalij Satanivskij" <satan@ukr.net>, "Allan Jude" <freebsd@allanjude.com>, "Dmitriy Makarov" <supportme@ukr.net> Cc: freebsd-current@freebsd.org Subject: Re: ZFS L2ARC - incorrect size and abnormal system load on r255173 Message-ID: <3E3F85F87B0D40C6A776A42786EEF08D@multiplay.co.uk> References: <1381166916.122992963.5h9ygiri@frv45.ukr.net> <1381170764.32684.31088349.343931EE@webmail.messagingengine.com> <20131007185032.GA82932@hell.ukr.net> <20131007211201.GA89306@hell.ukr.net> <20131010092223.GA28347@hell.ukr.net> <5256D9D4.2030308@allanjude.com> <20131010170334.GA71635@hell.ukr.net>
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First off I just wanted to clarify that you don't need to compression on dataset for L2ARC to use LZ4 compression, it does this by default as is not currently configurable. Next up I believe we've found the cause of this high load and I've just committed the fix to head: http://svnweb.freebsd.org/base?view=revision&sortby=file&revision=256889 Thanks to Vitalij for testing :) Dmitriy if you could test on your side too that would be appreciated. Regards Steve ----- Original Message ----- From: "Vitalij Satanivskij" <satan@ukr.net> To: "Allan Jude" <freebsd@allanjude.com> Cc: <freebsd-current@freebsd.org> Sent: Thursday, October 10, 2013 6:03 PM Subject: Re: ZFS L2ARC - incorrect size and abnormal system load on r255173 > AJ> Some background on L2ARC compression for you: > AJ> > AJ> http://wiki.illumos.org/display/illumos/L2ARC+Compression > > I'm alredy see it. > > > > AJ> http://svnweb.freebsd.org/base?view=revision&revision=251478 > AJ> > AJ> Are you sure that compression on pool/zfs is off? it would normally > AJ> inherit from the parent, so double check with: zfs get compression pool/zfs > > Yes, compression turned off on pool/zfs, it's was may time rechecked. > > > > AJ> Is the data on pool/zfs related to the data on the root pool? if > AJ> pool/zfs were a clone, and the data is actually used in both places, the > AJ> newer 'single copy ARC' feature may come in to play: > AJ> https://www.illumos.org/issues/3145 > > No, both pool and pool/zfs have diferent type of data, pool/zfs was created as new empty zfs (zfs create pool/zfs) > > and data was writed to it from another server. > > > Right now one machine work fine with l2arc. This machine without patch for corecting ashift on cache devices. > > At last 3 day's working with zero errors. Another servers with same config similar data, load and so on after 2 day > work began report abouy errors. > > > AJ> > AJ> > AJ> > AJ> -- > AJ> Allan Jude > AJ> > AJ> _______________________________________________ > AJ> freebsd-current@freebsd.org mailing list > AJ> http://lists.freebsd.org/mailman/listinfo/freebsd-current > AJ> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
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