2GB memory limit running fsck on a +6TB device
Santi Saez
santi at usansolo.net
Tue Jun 10 23:48:35 UTC 2008
Theodore Tso escribió:
> hmm..... can you send me the output of dumpe2fs /dev/sdXX? You can
> run that command while e2fsck is running, since it's read-only. I'm
> curious exactly how big the filesystem is, and how many directories
> are in the first part of the filesystem.
>
Upsss... dumpe2fs takes about 3 minutes to complete and generates about
133MB output file:
dumpe2fs 1.40.8 (13-Mar-2008)
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 7701b70e-f776-417b-bf31-3693dba56f86
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal dir_index filetype sparse_super
large_file
Default mount options: (none)
Filesystem state: clean with errors
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 792576000
Block count: 1585146848
Reserved block count: 0
Free blocks: 913341561
Free inodes: 678201512
First block: 0
Block size: 4096
Fragment size: 4096
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16384
Inode blocks per group: 512
Filesystem created: Mon Nov 13 10:12:49 2006
Last mount time: Mon Jun 9 19:37:12 2008
Last write time: Tue Jun 10 12:18:25 2008
Mount count: 37
Maximum mount count: -1
Last checked: Mon Nov 13 10:12:49 2006
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: tea
Directory Hash Seed: afabe3f6-4405-44f4-934b-76c23945db7b
Journal backup: inode blocks
Journal size: 32M
Some example output from group 0 to 5 is available at:
http://pastebin.com/f5341d121
> How big is the filesystem(s) that you are backing up via BackupPC, in
> terms of size (megabytes) and files (number of inodes)? And how many
> days of incremental backups are you keeping? Also, how often do files
> change? Can you give a rough estimate of how many files get modified
> per backup cycle?
>
Where are backing up several servers, near about 15 in this case, with
60-80GB data size to backup in each server and +2-3 millon inodes, with
15 day incrementals. I think near about 2-3% of the files changes each
day, but I will ask for more info to the backup administrator.
I have found and old doc with some build info for this server, the
partition was formated with:
# mkfs.ext3 -b 4096 -j -m 0 -O dir_index /dev/sda4
# tune2fs -c 0 -i 0 /dev/sda4
# mount -o data=writeback,noatime,nodiratime,commit=60 /dev/sda4 /backup
I'm going to fetch more info about BackupPC and backup cycles, thanks Ted!!
Regards,
--
Santi Saez
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