On Thu, 18 Nov 2010 07:30:14 +0200 Zoltan Szecsei <zoltans@xxxxxxxxxxxxxx> wrote: > Hi, > Can anyone please explain this to me? > > For the last >30 hours I have been loading some 2.5TB of 200-400MB tiff > images, from another PC on our internal network, onto this new array. > Yesterday, during this load process, I copied 10 of these files (about > 2.5GB) from the array onto the /home directory of the same system. > > It took 33 seconds, equating to some 75MB/s. > > This morning I came in to find that the load process had finished, so I > deleted the 10 test files from /home, and redid the identical copy test > (using bash-history, so: identical). > > It took 123 seconds, equating to some 20MB/s. > > Que? (as in Manuel from Faulty Towers :-) ) Maybe the first time some of the files were in RAM... how much RAM do you have, and how recently that the files been loaded before your copied them? NeilBrown - who has never been to Barcelona. > > > Thanks & regards, > Zoltan > > > root@gs0:/home/geograph# uname -a > Linux gs0 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:52:42 UTC 2010 > x86_64 GNU/Linux > root@gs0:/home/geograph# mdadm -V > mdadm - v3.1.4 - 31st August 2010 > root@gs0:/home/geograph# lvm version > LVM version: 2.02.54(1) (2009-10-26) > Library version: 1.02.39 (2009-10-26) > Driver version: 4.15.0 > root@gs0:/home/geograph# df #ext4 > Filesystem 1K-blocks Used Available Use% Mounted on > /dev/sdi7 426559760 9494844 395396872 3% /home > /dev/mapper/geo_vg0-geo_lvm0 > 11536635672 2530042680 8889387468 23% /mnt/geo_lvm0 > root@gs0:/home/geograph# > > -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
