Just a curiousity... I'm nc-ing a disk image from a laptop, like: gzip </dev/sda | nc target 4242 and on the target computer: nc -l -p 4242 | gunzip | dd bs=4k conv=sparse of=laptop-xp.img and on the target computer I am also impatiently doing: du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img and the output is a bit strange. The two values obviously differ a bit, and I'd expect them to differ more once it hits the empty part of the disk, but I'm getting outputs like: # du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img 834016 laptop-xp.img 831992 laptop-xp.img # du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img 841088 laptop-xp.img 672500 laptop-xp.img # du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img 844224 laptop-xp.img 752876 laptop-xp.img # du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img 851168 laptop-xp.img 849144 laptop-xp.img # du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img 855200 laptop-xp.img 853176 laptop-xp.img The size reported by du actually goes down periodically then up again. What's with that? The filesystem is btrfs but I don't know that that's anything to do with it. Just curious... James
Spam detection software, running on the system "itmustbe.luv.asn.au", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details. Content preview: James Harper writes: > Just a curiousity... I'm nc-ing a disk image from a laptop, like: > gzip </dev/sda | nc target 4242 > and on the target computer: > nc -l -p 4242 | gunzip | dd bs=4k conv=sparse of=laptop-xp.img
and on the target computer I am also impatiently doing: > du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img > and the output is a bit strange. [boring numbers...] > What's with that? The filesystem is btrfs but I don't know that that's anything to do with it. [...]
Content analysis details: (5.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 FH_HELO_EQ_D_D_D_D Helo is d-d-d-d 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (trentbuck[at]gmail.com) 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines 1.3 RDNS_NONE Delivered to internal network by a host with no rDNS 3.2 HELO_DYNAMIC_IPADDR Relay HELO'd using suspicious hostname (IP addr 1) 0.0 T_TO_NO_BRKTS_FREEMAIL T_TO_NO_BRKTS_FREEMAIL 0.0 TO_NO_BRKTS_NORDNS To: misformatted and no rDNS
Sorry. I will fix that as soon as I get good net access. On December 14, 2014 11:25:39 PM GMT+11:00, trentbuck@gmail.com wrote:
Spam detection software, running on the system "itmustbe.luv.asn.au", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see @@CONTACT_ADDRESS@@ for details.
Content preview: James Harper writes: > Just a curiousity... I'm nc-ing a disk image from a laptop, like: > gzip </dev/sda | nc target 4242 > and on the target computer: > nc -l -p 4242 | gunzip | dd bs=4k conv=sparse of=laptop-xp.img
and on the target computer I am also impatiently doing: > du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img > and the output is a bit strange. [boring numbers...] > What's with that? The filesystem is btrfs but I don't know that that's anything to do with it. [...]
Content analysis details: (5.6 points, 5.0 required)
pts rule name description ---- ---------------------- -------------------------------------------------- 1.1 FH_HELO_EQ_D_D_D_D Helo is d-d-d-d 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (trentbuck[at]gmail.com) 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines 1.3 RDNS_NONE Delivered to internal network by a host with no rDNS 3.2 HELO_DYNAMIC_IPADDR Relay HELO'd using suspicious hostname (IP addr 1) 0.0 T_TO_NO_BRKTS_FREEMAIL T_TO_NO_BRKTS_FREEMAIL 0.0 TO_NO_BRKTS_NORDNS To: misformatted and no rDNS
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From: trentbuck@gmail.com To: luv-main@luv.asn.au Sent: Sun Dec 14 23:25:39 GMT+11:00 2014 Subject: Re: du and btrfs
James Harper <james@ejbdigital.com.au> writes:
Just a curiousity... I'm nc-ing a disk image from a laptop, like: gzip </dev/sda | nc target 4242 and on the target computer: nc -l -p 4242 | gunzip | dd bs=4k conv=sparse of=laptop-xp.img and on the target computer I am also impatiently doing: du -sk --apparent-size laptop-xp.img && du -sk laptop-xp.img and the output is a bit strange. [boring numbers...] What's with that? The filesystem is btrfs but I don't know that that's anything to do with it.
Try HUPping the dd instead (or use gddrescue) to find out how much IT thinks is written. btrfs is probably just being weird in what it tells df/du -- I see that a lot.
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participants (3)
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James Harper -
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trentbuck＠gmail.com