Date: Tue, 7 Jul 2009 18:16:58 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: "Marat N.Afanasyev" <amarat@ksu.ru> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: bug in ufs? Message-ID: <20090707081658.GA68385@server.vk2pj.dyndns.org> In-Reply-To: <4A50E947.9020608@ksu.ru> References: <4A50E947.9020608@ksu.ru>
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--W/nzBZO5zC0uMSeA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2009-Jul-05 21:56:23 +0400, "Marat N.Afanasyev" <amarat@ksu.ru> wrote: >i have a strange problem with writing data to my ufs2+su filesystem. Overall, I think you are pushing UFS and have hit one of its limits. >1. i made a 1T gpt partition on my storage server, and formatted it: >newfs -U -m 0 -o time -i 32768 /dev/da1p3a '-m 0' is undesirable. The default 8% free space is intended to hide the sort of effect you've run into. Unless you can find a slightly bigger disk, I suggest you try building an 8K/1K filesystem by adding '-b 8192 -f 1024' - this will be slightly slower than the default 16K/2K but will hopefully allow you to fit slightly more files in. >2. i tried to move data from other servers to this filesystem, total=20 >size of files is slightly less than 1T Can you be more accurate than "slightly less than 1T" (ie how many MiB) and what is the size distribution of the files? The average size is 48KiB but are they all roughly the same size or do they vary widely? Are there many files <16KiB? >3. i encountered a 'No space left on device' while i still have 11G of=20 >free space and about 13 million free inodes on the filesystem: > >#df -ih >Filesystem Size Used Avail Capacity iused ifree %iused=20 >Mounted on >/dev/da1p3a 1.0T 1.0T 11G 99% 20397465 13363173 60%=20 >/mnt/45_114 More significant figures are needed. How about 'df -im' or 'df -ik'. How close are you to fitting in all the files you want? >all i want to know is whether this is a bug or a feature? and if such a=20 >behavior is well-known, where can i read about it? Have a read of /usr/share/doc/smm/05.fastfs/paper.ascii.gz - especially the bits about "fragments". Whilst this paper talks about the original UFS and a 4K/1K configuration, the principles remain the same in UFS2. --=20 Peter Jeremy --W/nzBZO5zC0uMSeA Content-Type: application/x-pkcs7-signature Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIIPuQYJKoZIhvcNAQcCoIIPqjCCD6YCAQExCzAJBgUrDgMCGgUAMAsGCSqGSIb3DQEHAaCC DSUwggXgMIIDyKADAgECAgMD984wDQYJKoZIhvcNAQEFBQAweTEQMA4GA1UEChMHUm9vdCBD QTEeMBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0IFNp Z25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2VydC5vcmcwHhcN MDcwODI4MDA1MjAzWhcNMDkwODI3MDA1MjAzWjCBoDEVMBMGA1UEAxMMUGV0ZXIgSmVyZW15 MSswKQYJKoZIhvcNAQkBFhxwZXRlcmplcmVteUBvcHR1c2hvbWUuY29tLmF1MScwJQYJKoZI hvcNAQkBFhhwZXRlci5qZXJlbXlAYXV1Zy5vcmcuYXUxMTAvBgkqhkiG9w0BCQEWInBldGVy LmplcmVteUBhbGNhdGVsLWx1Y2VudC5jb20uYXUwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAw ggEKAoIBAQC0saUsCMQRDIW7pALRwK5z9/gRCBYiYNnmx9fYEsDiIJ1zYJd33Z7hJ4exUXOG 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