Date: Mon, 7 Mar 2005 18:00:30 +0300 (MSK) From: Dmitry Morozovsky <marck@rinet.ru> To: delphij@delphij.net Cc: freebsd-stable@freebsd.org Subject: Re: RELENG_5, snapshots and disk lock time Message-ID: <20050307175506.H4264@woozle.rinet.ru> In-Reply-To: <1110205630.669.3.camel@spirit> References: <20050307151733.I4264@woozle.rinet.ru> <1110205630.669.3.camel@spirit>
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On Mon, 7 Mar 2005, Xin LI wrote: XL> > dumping the snapshot of 140G ufs2 fyle system under contemporary RELENG_5 I XL> > found that during mksnap_ffs file system is unresponsible even for reading for XL> > more than 3 minutes (it's on modern SATA disk with 50+ MBps linear transfer). XL> > Is it normal? XL> XL> mksnap_ffs is expected to suspend your write access, but I think 3 XL> minutes is too long for a 140G file system. Would you please send the XL> dumpfs output of the said file system? Well, as I said, it was even for read access. I checked this with the simple shell script #!/bin/sh while true; do sleep 5 date ls /lh/.snap done when dump -L executes mksnap_ffs for /lh, there is 3:20 pause between dates. dumpfs output is available at http://woozle.hole.ru/misc/dumpfs-lh.gz (83k) Sincerely, D.Marck [DM5020, MCK-RIPE, DM3-RIPN] ------------------------------------------------------------------------ *** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru *** ------------------------------------------------------------------------
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