Hi,
I'm not really answering your question, but may I suggest you change
your backup strategy to leverage one of btrfs main features: instead of
using the hardlink-feature of rsync, use snapshots. Btrfs snapshots are
way better than a hardlink-tree, for multiple reasons:
- It uses less diskspace, because only real changes take up extra space;
- It performs way better, because making a snapshot is really cheap
while making the entire hardlink tree can be expensive, especially on
large backups (many files);
- With the hardlink feature of rsync, it is not possible to reliably
backup existing hardlinks. Now that you're no longer using hardlinks for
the backup itself, you can easily add the -H switch to rsync;
- Generally rsync can not reliably resume a backup with --link-dest when
it's interrupted, for instance by a network failure. In that case you
have to trash the partial backup and start over. Now that you're no
longer using --link-dest, you can resume just fine.
I used your setup (using rsnapshot, which is a rsync wrapper) and
switched over to snapshots (and for that reason to btrfs) exactly
because of these advantages.
Kind regards,
Erik.
On 12/16/2010 01:31 PM, Jörg Sommer wrote:
> Hi,
>
> I have a btrfs that conains many hardlinks. I'm using rsync to create
> backups. It creates the backup of a day by (hard‐)linking the files
> (inodes) they haven't changed with the files from a former day.
>
> % find 2010-12-1[10]-00 -maxdepth 1
> 2010-12-10-00
> 2010-12-10-00/etc
> 2010-12-10-00/home
> 2010-12-10-00/root
> 2010-12-10-00/srv
> 2010-12-10-00/usr
> 2010-12-10-00/var
> 2010-12-11-00
> 2010-12-11-00/etc
> 2010-12-11-00/home
> 2010-12-11-00/root
> 2010-12-11-00/srv
> 2010-12-11-00/usr
> 2010-12-11-00/var
> % stat 2010-12-1[01]-00/etc/services
> File: „2010-12-10-00/etc/services“
> Size: 18480 Blocks: 40 IO Block: 4096 reguläre Datei
> Device: 15h/21d Inode: 7945534 Links: 7
> Access: (0644/-rw-r--r--) Uid: ( 1000/ateo-service) Gid: ( 34/ backup)
> Access: 2010-11-19 02:26:01.000000000 +0100
> Modify: 2008-08-28 04:00:12.000000000 +0200
> Change: 2010-12-14 07:56:19.999523630 +0100
> File: „2010-12-11-00/etc/services“
> Size: 18480 Blocks: 40 IO Block: 4096 reguläre Datei
> Device: 15h/21d Inode: 7945534 Links: 7
> Access: (0644/-rw-r--r--) Uid: ( 1000/ateo-service) Gid: ( 34/ backup)
> Access: 2010-11-19 02:26:01.000000000 +0100
> Modify: 2008-08-28 04:00:12.000000000 +0200
> Change: 2010-12-14 07:56:19.999523630 +0100
>
> When running rm -r to remove an old backup or running rsync I see the
> average size of a read or a write request ist 4k. This leads to a very
> bad throughput of fewer than 2MByte/s. I'm using atop to watch these
> numbers.
>
> rsync is mostly doing this:
>
> 02:54:30.027895 link("../2010-12-14-00/home/peter/dump_070903",
> "home/peter/dump_070903") = 0
> 02:54:30.028398 lstat("home/peter/dump_070904", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.028475 lstat("../2010-12-14-00/home/peter/dump_070904",
> {st_dev=makedev(0, 21), st_ino=9813608, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3244,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/05-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.028598 lgetxattr("../2010-12-14-00/home/peter/dump_070904",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.028679 lgetxattr("../2010-12-14-00/home/peter/dump_070904",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.028734 llistxattr("../2010-12-14-00/home/peter/dump_070904",
> 0x1612800, 1024) = 17
> 02:54:30.028783 link("../2010-12-14-00/home/peter/dump_070904",
> "home/peter/dump_070904") = 0
> 02:54:30.029078 lstat("home/peter/dump_070905", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.029127 lstat("../2010-12-14-00/home/peter/dump_070905",
> {st_dev=makedev(0, 21), st_ino=9813609, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3251,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/06-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.029226 lgetxattr("../2010-12-14-00/home/peter/dump_070905",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.029290 lgetxattr("../2010-12-14-00/home/peter/dump_070905",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.029343 llistxattr("../2010-12-14-00/home/peter/dump_070905",
> 0x1612800, 1024) = 17
> 02:54:30.029389 link("../2010-12-14-00/home/peter/dump_070905",
> "home/peter/dump_070905") = 0
> 02:54:30.029564 lstat("home/peter/dump_070906", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.029612 lstat("../2010-12-14-00/home/peter/dump_070906",
> {st_dev=makedev(0, 21), st_ino=9813610, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3183,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/07-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.029704 lgetxattr("../2010-12-14-00/home/peter/dump_070906",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.029767 lgetxattr("../2010-12-14-00/home/peter/dump_070906",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.029819 llistxattr("../2010-12-14-00/home/peter/dump_070906",
> 0x1612800, 1024) = 17
> 02:54:30.029865 link("../2010-12-14-00/home/peter/dump_070906",
> "home/peter/dump_070906") = 0
> 02:54:30.030097 lstat("home/peter/dump_070907", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.030145 lstat("../2010-12-14-00/home/peter/dump_070907",
> {st_dev=makedev(0, 21), st_ino=9813611, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3239,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/08-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.030240 lgetxattr("../2010-12-14-00/home/peter/dump_070907",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.030601 lgetxattr("../2010-12-14-00/home/peter/dump_070907",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.030658 llistxattr("../2010-12-14-00/home/peter/dump_070907",
> 0x1612800, 1024) = 17
> 02:54:30.030707 link("../2010-12-14-00/home/peter/dump_070907",
> "home/peter/dump_070907") = 0
> 02:54:30.030913 lstat("home/peter/dump_070908", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.030964 lstat("../2010-12-14-00/home/peter/dump_070908",
> {st_dev=makedev(0, 21), st_ino=9813612, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=5, st_size=2802,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/09-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.031061 lgetxattr("../2010-12-14-00/home/peter/dump_070908",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.032196 lgetxattr("../2010-12-14-00/home/peter/dump_070908",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.032272 llistxattr("../2010-12-14-00/home/peter/dump_070908",
> 0x1612800, 1024) = 17
> 02:54:30.032320 link("../2010-12-14-00/home/peter/dump_070908",
> "home/peter/dump_070908") = 0
> 02:54:30.032576 lstat("home/peter/dump_070909", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.032628 lstat("../2010-12-14-00/home/peter/dump_070909",
> {st_dev=makedev(0, 21), st_ino=9813613, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=5, st_size=2672,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/10-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.032728 lgetxattr("../2010-12-14-00/home/peter/dump_070909",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.032793 lgetxattr("../2010-12-14-00/home/peter/dump_070909",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.032846 llistxattr("../2010-12-14-00/home/peter/dump_070909",
> 0x1612800, 1024) = 17
> 02:54:30.032893 link("../2010-12-14-00/home/peter/dump_070909",
> "home/peter/dump_070909") = 0
> 02:54:30.033094 lstat("home/peter/dump_070910", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.033142 lstat("../2010-12-14-00/home/peter/dump_070910",
> {st_dev=makedev(0, 21), st_ino=9813614, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3393,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/11-01:13:00,
> st_ctime=2010/12/14-08:08:31}) = 0
> 02:54:30.033237 lgetxattr("../2010-12-14-00/home/peter/dump_070910",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.033902 lgetxattr("../2010-12-14-00/home/peter/dump_070910",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.033960 llistxattr("../2010-12-14-00/home/peter/dump_070910",
> 0x1612800, 1024) = 17
> 02:54:30.034018 link("../2010-12-14-00/home/peter/dump_070910",
> "home/peter/dump_070910") = 0
> 02:54:30.034123 lstat("home/peter/dump_070911", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.034171 lstat("../2010-12-14-00/home/peter/dump_070911",
> {st_dev=makedev(0, 21), st_ino=9813615, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3340,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/12-01:13:00,
> st_ctime=2010/12/14-08:08:32}) = 0
> 02:54:30.034264 lgetxattr("../2010-12-14-00/home/peter/dump_070911",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.034324 lgetxattr("../2010-12-14-00/home/peter/dump_070911",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.034376 llistxattr("../2010-12-14-00/home/peter/dump_070911",
> 0x1612800, 1024) = 17
> 02:54:30.036405 link("../2010-12-14-00/home/peter/dump_070911",
> "home/peter/dump_070911") = 0
> 02:54:30.036986 lstat("home/peter/dump_070912", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.037045 lstat("../2010-12-14-00/home/peter/dump_070912",
> {st_dev=makedev(0, 21), st_ino=9813616, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3407,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/13-01:13:00,
> st_ctime=2010/12/14-08:08:32}) = 0
> 02:54:30.037155 lgetxattr("../2010-12-14-00/home/peter/dump_070912",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.057221 lgetxattr("../2010-12-14-00/home/peter/dump_070912",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.057279 llistxattr("../2010-12-14-00/home/peter/dump_070912",
> 0x1612800, 1024) = 17
> 02:54:30.057347 link("../2010-12-14-00/home/peter/dump_070912",
> "home/peter/dump_070912") = 0
> 02:54:30.057574 lstat("home/peter/dump_070913", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.057625 lstat("../2010-12-14-00/home/peter/dump_070913",
> {st_dev=makedev(0, 21), st_ino=9813617, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3335,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/14-01:13:00,
> st_ctime=2010/12/14-08:08:32}) = 0
> 02:54:30.057724 lgetxattr("../2010-12-14-00/home/peter/dump_070913",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.057788 lgetxattr("../2010-12-14-00/home/peter/dump_070913",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.057841 llistxattr("../2010-12-14-00/home/peter/dump_070913",
> 0x1612800, 1024) = 17
> 02:54:30.057889 link("../2010-12-14-00/home/peter/dump_070913",
> "home/peter/dump_070913") = 0
> 02:54:30.058126 lstat("home/peter/dump_070914", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.058175 lstat("../2010-12-14-00/home/peter/dump_070914",
> {st_dev=makedev(0, 21), st_ino=9813618, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3166,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/15-01:13:00,
> st_ctime=2010/12/14-08:08:32}) = 0
> 02:54:30.058269 lgetxattr("../2010-12-14-00/home/peter/dump_070914",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.058332 lgetxattr("../2010-12-14-00/home/peter/dump_070914",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.058385 llistxattr("../2010-12-14-00/home/peter/dump_070914",
> 0x1612800, 1024) = 17
> 02:54:30.058432 link("../2010-12-14-00/home/peter/dump_070914",
> "home/peter/dump_070914") = 0
> 02:54:30.058674 lstat("home/peter/dump_070915", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.058722 lstat("../2010-12-14-00/home/peter/dump_070915",
> {st_dev=makedev(0, 21), st_ino=9813619, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=5, st_size=3056,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/16-01:13:00,
> st_ctime=2010/12/14-08:08:32}) = 0
> 02:54:30.059068 lgetxattr("../2010-12-14-00/home/peter/dump_070915",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.059139 lgetxattr("../2010-12-14-00/home/peter/dump_070915",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.059192 llistxattr("../2010-12-14-00/home/peter/dump_070915",
> 0x1612800, 1024) = 17
> 02:54:30.059241 link("../2010-12-14-00/home/peter/dump_070915",
> "home/peter/dump_070915") = 0
> 02:54:30.059513 lstat("home/peter/dump_070916", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.059568 lstat("../2010-12-14-00/home/peter/dump_070916",
> {st_dev=makedev(0, 21), st_ino=9813620, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=5, st_size=2864,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/17-01:13:00,
> st_ctime=2010/12/14-08:08:33}) = 0
> 02:54:30.100912 lgetxattr("../2010-12-14-00/home/peter/dump_070916",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.100986 lgetxattr("../2010-12-14-00/home/peter/dump_070916",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.101042 llistxattr("../2010-12-14-00/home/peter/dump_070916",
> 0x1612800, 1024) = 17
> 02:54:30.101091 link("../2010-12-14-00/home/peter/dump_070916",
> "home/peter/dump_070916") = 0
> 02:54:30.101488 lstat("home/peter/dump_070917", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.101543 lstat("../2010-12-14-00/home/peter/dump_070917",
> {st_dev=makedev(0, 21), st_ino=9813621, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3220,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/18-01:13:00,
> st_ctime=2010/12/14-08:08:33}) = 0
> 02:54:30.101646 lgetxattr("../2010-12-14-00/home/peter/dump_070917",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.101714 lgetxattr("../2010-12-14-00/home/peter/dump_070917",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.101769 llistxattr("../2010-12-14-00/home/peter/dump_070917",
> 0x1612800, 1024) = 17
> 02:54:30.101819 link("../2010-12-14-00/home/peter/dump_070917",
> "home/peter/dump_070917") = 0
> 02:54:30.102024 lstat("home/peter/dump_070918", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.102075 lstat("../2010-12-14-00/home/peter/dump_070918",
> {st_dev=makedev(0, 21), st_ino=9813622, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3184,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/19-01:13:00,
> st_ctime=2010/12/14-08:08:33}) = 0
> 02:54:30.102172 lgetxattr("../2010-12-14-00/home/peter/dump_070918",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.102237 lgetxattr("../2010-12-14-00/home/peter/dump_070918",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.102291 llistxattr("../2010-12-14-00/home/peter/dump_070918",
> 0x1612800, 1024) = 17
> 02:54:30.102339 link("../2010-12-14-00/home/peter/dump_070918",
> "home/peter/dump_070918") = 0
> 02:54:30.102559 lstat("home/peter/dump_070919", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.102609 lstat("../2010-12-14-00/home/peter/dump_070919",
> {st_dev=makedev(0, 21), st_ino=9813623, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=6, st_size=3275,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/20-01:13:00,
> st_ctime=2010/12/14-08:08:33}) = 0
> 02:54:30.942826 lgetxattr("../2010-12-14-00/home/peter/dump_070919",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.942916 lgetxattr("../2010-12-14-00/home/peter/dump_070919",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.942977 llistxattr("../2010-12-14-00/home/peter/dump_070919",
> 0x1612800, 1024) = 17
> 02:54:30.943029 link("../2010-12-14-00/home/peter/dump_070919",
> "home/peter/dump_070919") = 0
> 02:54:30.945281 lstat("home/peter/dump_070920", 0x7fffd17410c0) = -1 ENOENT
> (No such file or directory)
> 02:54:30.945375 lstat("../2010-12-14-00/home/peter/dump_070920",
> {st_dev=makedev(0, 21), st_ino=9813624, st_mode=S_IFREG|0644, st_nlink=7,
> st_uid=1000, st_gid=34, st_blksize=4096, st_blocks=5, st_size=3006,
> st_atime=2010/11/20-08:25:40, st_mtime=2007/09/21-01:13:00,
> st_ctime=2010/12/14-08:08:33}) = 0
> 02:54:30.945500 lgetxattr("../2010-12-14-00/home/peter/dump_070920",
> "user.rsync.%stat", "100644 0,0 1001:1000", 255) = 20
> 02:54:30.945582 lgetxattr("../2010-12-14-00/home/peter/dump_070920",
> "user.rsync.%aacl", 0x0, 0) = -1 ENODATA (No data available)
> 02:54:30.945639 llistxattr("../2010-12-14-00/home/peter/dump_070920",
> 0x1612800, 1024) = 17
> 02:54:30.945691 link("../2010-12-14-00/home/peter/dump_070920",
> "home/peter/dump_070920") = 0
>
> and rm is mostly doing that:
>
> unlinkat(8, "TERASSE_01.jpg", 0) = 0
> unlinkat(8, "TERASSE_02-600x470.jpg", 0) = 0
> unlinkat(8, "TERASSE_02.jpg", 0) = 0
> unlinkat(8, "TERASSE_03-600x463.jpg", 0) = 0
> unlinkat(8, "TERASSE_03.jpg", 0) = 0
> unlinkat(8, "TERASSE_04-600x466.jpg", 0) = 0
> unlinkat(8, "TERASSE_04.jpg", 0) = 0
> close(8) = 0
> unlinkat(6, "pic", AT_REMOVEDIR) = 0
> close(6) = 0
> unlinkat(4, "fuerte", AT_REMOVEDIR) = 0
> newfstatat(4, "fuerteventura_elba_sara", {st_mode=S_IFDIR|0777, st_size=448,
> ...}, AT_SYMLINK_NOFOLLOW) = 0
> openat(4, "fuerteventura_elba_sara",
> O_RDONLY|O_NOCTTY|O_NONBLOCK|O_DIRECTORY) = 3
> fcntl(3, F_GETFD) = 0
> fcntl(3, F_SETFD, FD_CLOEXEC) = 0
> fstat(3, {st_mode=S_IFDIR|0777, st_size=448, ...}) = 0
> fcntl(3, F_GETFL) = 0x18800 (flags
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY)
> fcntl(3, F_SETFD, FD_CLOEXEC) = 0
> fcntl(3, F_DUPFD, 3) = 6
> fcntl(6, F_GETFD) = 0
> fcntl(6, F_SETFD, FD_CLOEXEC) = 0
> getdents(3, /* 15 entries */, 32768) = 568
> getdents(3, /* 0 entries */, 32768) = 0
> close(3) = 0
> unlinkat(6, "beschreibung.php3", 0) = 0
> unlinkat(6, "buchungsanfrage.php3", 0) = 0
> unlinkat(6, "buchungsanfrage_danke.php3", 0) = 0
> unlinkat(6, "buchungsanfrage_formular.php3", 0) = 0
> unlinkat(6, "buchungsanfragenavi.php3", 0) = 0
> unlinkat(6, "email_gen.php3", 0) = 0
> unlinkat(6, "fotos.php3", 0) = 0
>
> Now, the question is, what can I do to increase the throughput? Can I
> make btrfs caches more aggressively?
>
> % free -m
> total used free shared buffers cached
> Mem: 3006 2696 310 0 5 2098
> -/+ buffers/cache: 591 2414
> Swap: 0 0 0
>
> # smartctl -i /dev/sdb
> smartctl 5.40 2010-07-12 r3124 [x86_64-unknown-linux-gnu] (local build)
> Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
>
> === START OF INFORMATION SECTION ===
> Model Family: Western Digital Caviar Green (Adv. Format) family
> Device Model: WDC WD15EARS-00MVWB0
> Serial Number: WD-WCAZA1548514
> Firmware Version: 51.0AB51
> User Capacity: 1.500.301.910.016 bytes
> Device is: In smartctl database [for details use: -P show]
> ATA Version is: 8
> ATA Standard is: Exact ATA specification draft version not indicated
> Local Time is: Thu Dec 16 13:28:50 2010 CET
> SMART support is: Available - device has SMART capability.
> SMART support is: Enabled
>
> Should I provide more informations?
>
> Bye, Jörg.
>
> PS: Please, Cc me. I'm not subscribed the list.
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