Re: Re: File system defragmentation. Something that can resume after stopping.
Javier Martinez <[email protected]> Thu, 14 May 2026 18:38:09 +0200
| Newsgroups | gmane.linux.gentoo.user |
|---|---|
| Message-ID | <[email protected]> |
El 14/5/26 a las 18:18, Holger Hoffstätte escribió: > On 2026-05-14 12:30, Michael wrote: >> There's this archived paper from a 2007 Linux Symposium which explains >> how >> linux filesystems intelligently delay writing data to disk until the last >> moment so that data is allocated as contiguously as possible. Also, >> after a > > That (delalloc) is unfortunately not even half the story. XFS is still > the only > filesystem (on Linux) that does persistent preallocation on regular writes, > and splitting the filesystem into multiple AGs (allocation groups) is > much more > effective for *long-term* mixed-size free-space management than whatever > ext4 > does even today. > > So while we're posting papers: > https://www.usenix.org/conference/hotstorage19/presentation/conway > > Enjoy :) > > -h > Without light everyone are like the others... so... If you have your disks almost full, no filesystem will rescue you from fragmentation.
OpenPGP_0x57E64E0B7FC3BEDF.asc
(application/pgp-keys, 3 KB)
-----BEGIN PGP PUBLIC KEY BLOCK----- xsFNBE83vpcBEADBp5ERdgj5AV2i3Hwy0cA0ympwJ7k/dlukgiWYwgG9pTfnXtgk +cM2m6M4uh7Z/zhCglo5SyQP4tcKUvjXVUNYDbYioL7cJL0QD4fgzXPG8m9/1a+y 7worBoIw+HHJRyXxpEOOqUoc+NCN7dtx1meRF4scnGaXo4f8inTmOd0IyrhlUaEU sOa2e6ShJZOwOqyblfzPp96DIEo5aX2i5XqvlAxrueGY8AkbT40cqZLGi6i9PCQm 02aDmPK1wEKaJRHZUZoIcUvtija0ua835e8SLOTESn0/Q8LknM5vGNyurIRFpVQx LDHaP8ELBD2NLFUKYNDkMRs/lUy/zlDFUaoYOFth9bDiyqo7ft9MYCnUBgsR3IWY Jt6vYg59GTNWgQKPgoqas2If6E55vYh61D7A4SP7hfx4yR35OeBMRV/TFkkmk7AT 4jKdszIEpAIHPkuA72cTKapMuvyGeYszzgY+kTG5v0ZPrgS/73zUwYYXPTKxpvea tV3FKWJ1yFH/k5CtLQNSCdBw4hXwv3/NS6+iQZk6r0Ym9L8oaFlwnXs1HUMJ8Dnz PQHI/d1/37iePa/cz0k9hWagTRT6IdNiK/wS0lNt3JAAV/XbcRV69FYj62Jw89c/ VHT/OJL8SLa5TpIyIJDhm8b2ihQy2jdO/r7KmkFn5KNQLbVIkGVc1VBJgwARAQAB zTJKYXZpZXIgSnVhbiBNYXJ0aW5leiBDYWJlem9uIDx0YXpvay5pZDBAZ21haWwu Y29tPsLBeAQTAQIAIgUCTze+lwIbAwYLCQgHAwIGFQgCCQoLBBYCAwECHgECF4AA CgkQV+ZOC3/Dvt/o9A//WoU/k/qlVC/YQDqdfSFhcWukw8fDtI41CmBB3bwut991 yL7qGSOGseM9dsWNXdAYL1biDIQFdiZOdnntvKwIRI/32SQb1VvGTj4ikq4llSpL szhEBvV+WRvqfbrJtfCNdsCL4wKIJUZk9W8r6mFw2xxHITH+db43QciM0gTfS7w3 1o80K9g4jv54r7oraO9zU5xoAK0iWA7sKWNKbuZPrgbgiiIKttwyvJyi1YFsRWV3 cT07h4QG4I2IIRcq3w8AB1ik/uGwEStw3Wsr4hmv514+8xEsA9avz0tHL38Jop3I zQInCBQIXt8+XDy8YOi89S8Ov9ZThDcMT2qnxfqMJPRbs/71mKTKcoN6UbMqIiXV sNXtMZESwJ8V1eGJVnf+PtZ8RWwwTouhlWaTQ4iqboGyt8VoSIFX/lvx2qJHrw02 7mbHjKT6tZp9dPn10cSFJgI41HNIx858e8WMUaByOa/EijfWMsSQIvvOaAxMlXcC I+cURrmuW9DFBgB6/4r1WQlpH+BgWgc910zi9PYE+rrqi9wI10opX7WQWr/I9Ajz 3TztAoiCn0CxRapBzxacbpjX4YuXLjzl39ARGy4whGoz/mEtiGlFR0TMFDQU3DB4 I7jv35LJHXUkTsfIGYNm8VCsJOqeU+On6UInpwRWO2k0qOxa4iKGiJml2/q0sMvO wU0ETze+lwEQALOJbk7hPoXtDPf6xOFx8xeuOgqI27d+L+ou71/HHaimVVn2lb58 +8fF+LMM16n50CUwKhrgsVvSXThlkTI+cp9YxJi6SYgeMIUWCNm5hM8df46TsysX znbHht8opn3ZYopudq6EmIN2cIT9gmckYOlQ8m600eSuVy9/7rdvBorRkfZBAGCR bTbhZGK6ruC7uHlQB/MBbA2O1iJIUU4zKFBcJEoAncyYa4LBzIw7l1LpA1+pNEVw YZBBVDQBGMqpOoGdCw7NM7iWgnyK8YlJzd35Hg8ZTC812nmqYr0dHbe7MBF1mJYw O60nOv8EABHpyCCDVqc4t4PrsJbZW+TCMbavrXIgvfFOHloLzHznm/gVuU2rS4nW y1c5OL0RPANZTjhrEqJuP0eQ9MxeMWP6ntC83xzX39YIURXY4N/cIBSHujnDmgQk dGEe1H6SHleTKbzqzEAHY9PoPCZW7aGFGKyXK/JAwNvgPLIkkX9KSHKQB9gR815k Nzi+QE7o/QIec3PltidZXcqzKUYiC8n48yQlES/7jKSBs4L2IH/fF5a3YcrRvQII LWdQ1633T4+bEzhYdFYu5W28Jq/yR3rCsw6tuPh84d9uRMtKL7GiyROpMtR971+a o64zhiyuPru5ka6uBIRtw5LZ3wokWVcI4Vl+aico1ZFoFX/JlyX5Z1IrABEBAAHC wV8EGAECAAkFAk83vpcCGwwACgkQV+ZOC3/Dvt9GFBAAuHGiFb0K+DJlI7wTeVd7 q3lFhPo+aos1uraUMNGyIQG3L8lDuFa6YhTEKALBeegZKCb4SSUKP+uWcCEoLr2A gQOzOkh6yxHR67s8VGFqGChT4Jo9QxUFWInMOhaDXnrrYvMWgVlJfJvQqLDRrwBs Zn8wGhTDAd9lb8QFSEg8YSVTLmz6UcbKf+zakpFbvBiMSYAgt8lRGafx0EsBR1qt 6RQRWmtlAxL00IEZ7nBzAKDRrTYGeelojmDtJxk6WEJp4MoKnO8drJ4xQ8ibbsep NSc7UREQ8qUv7ftOI7OwWgS8dNb7ynL9c3bWZOI6IBjwIKPdVJDYT5ug+EeG6joB QocK7RSLHpNEWPWYuuqMKqa8jbv59wlfCEgObapJPMcjKxhQ3taYyYO/SVJATiFK Tflam051rKyI5DMmCXEWe8DcATBj8n3l5YpjFLAARNvSDJPNKeKnUFNWFK2Wa6cJ Nf7ymzVGQ6BH+pDiKTtH4ZFMsj+sSy9l8TQVCaGGx5v9FMkpnWF2P6TtwwrUx5Mj vJkQnYCIFy6Xa+6Kvlc4EbHH8jyMZwX7eA+YnZ6zPTXnDKVW/Ld6S/fj+3Qufdls WKTeu4pX6DpBvkYQ8JmgXec0nVxLsnISDEzqT/bGBMoqzZRHYv5kZGeX5DV10o5D WOXUvJAcsDi1nCIExph6woc= =Q8sa -----END PGP PUBLIC KEY BLOCK-----
OpenPGP_signature.asc
(application/pgp-signature, 840 B)
-----BEGIN PGP SIGNATURE----- wsF5BAABCAAjFiEEvP6QGwCEwDC3+UanV+ZOC3/Dvt8FAmoF+nEFAwAAAAAACgkQV+ZOC3/Dvt8S rxAAioa2zu17kXPsYJRvvhCFOwzmy4SbgopBeXaGBCTu+nUErUXrkFlx9QH0njcqZR4si6Sdpyfo aDAAclR24gd/VcD61gUb0+IF03hzTzo7n3J2lW6UKY8APHWJgWSQSIR+htG/i9v7BndsRLKmM7at DN9+r4LRdREwgjgjXH328w3/sBltJ4DmOcWzYuVv9VW3HihCWSmyYg5wTrVHOTFDg3vBwhZk8UFw jESl5fB0339h/L2lABBtuCc7BoRg5Gzu4Qwtpphzhoa8PHJdUkN/g/+1NnLzgA8ofNoGGAorVYQP nfd85y4DQE9/AA6vI+/+27DBpgYGmD8U3F8pyyPo/1DJoECzjwzLg64/7/4Ah8WCD8LHtpwdDgKx mqm9yzkO/TXCqGqIX08Ax7w/41NXkXzhzizBGSTnwibPEhaLRFvzxjc3e232jq2XnQXJ7CAUqa9m 9SAQALQHlmenjbhwEXoBnnuSGWSRwLPUEMTKL/ceHeKaNltcjEbc1Ji1F+BY451fyWRD4JoLihPM jl6cKJnNfGqa2WxKtGiFtKF1qTWQlaq0t/RDiQgUtluH91CBCesdVFnwFr+fL+73hX31DOGiAzWn eDjtfPeJf3y3V5xpDmYqawWeIv5BYwJJkblAB5YcatGTdSooQO8RM31/Rom7t8H0hIhg1fLegxxl MeI= =3z69 -----END PGP SIGNATURE-----