On Sun, 28 Nov 2004, Guy wrote:
I use dd to test disks, and arrays. Give this a test. It may stop at the 2TB limit, not sure. My monster 14 disk array is only about 240G.
time dd if=/dev/md0 of=/dev/null bs=1024k
]# dd if=/dev/zero of=testfile bs=8192 dd: writing `testfile': No space left on device 285696059+0 records in 285696058+0 records out
du doesn't undestand the size :
]# du -h 132G .
ls understands a bit (total is incorrect, but filesize is ok) :
]# ls -la total 138084832 drwxr-xr-x 21 root root 4096 Nov 29 01:40 .. drwxr-xr-x 2 root root 21 Nov 29 02:07 . -rw-r--r-- 1 root root 2340422111232 Nov 29 07:39 testfile
]# ls -al -h total 132G drwxr-xr-x 2 root root 21 Nov 29 02:07 . drwxr-xr-x 21 root root 4.0K Nov 29 01:40 .. -rw-r--r-- 1 root root 2.1T Nov 29 07:39 testfile
no errors in dmesg so looks like it's ok it's only a bit slow :
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
storage.a2000.nu 2G 26828 99 123983 73 58525 57 27336 99 171371 96 583.9 4
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1023 12 +++++ +++ 920 11 1004 14 +++++ +++ 722 9
storage.a2000.nu,2G,26828,99,123983,73,58525,57,27336,99,171371,96,583.9,4,16,1023,12,+++++,+++,920,11,1004,14,+++++,+++,722,9
compared to the old raid5 with 13 disk (with redhat 8 and kernel 2.4) :
met 13 disken : (rh 8 ext3)
Version 1.02c ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
storage.a2000.nu 1G 17775 100 100912 99 70290 66 23648 99 257029 81 624.1 3
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1944 99 +++++ +++ +++++ +++ 2042 98 +++++ +++ 5689 97
storage.a2000.nu,1G,17775,100,100912,99,70290,66,23648,99,257029,81,
624.1,3,16,1944,99,+++++,+++,+++++,+++,2042,98,+++++,+++,5689,97
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