Hi all, my RAID array is filling up, so this bug started to effect me as well. My NAS is running from a 40GB SSD drive.
Linux CSNAS 2.6.38-8-server #42-Ubuntu SMP Mon Apr 11 03:49:04 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.04 DISTRIB_CODENAME=natty DISTRIB_DESCRIPTION="Ubuntu 11.04" I have a RAID6 setup, 16x2TB disks using an Adaptec 51645 card. It is a single EXT4 volume: Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 11518469088 10420881676 1097587412 91% /mnt/raid6 Mount params: # <file system> <mount point> <type> <options> <dump> <pass> # RAID6 - backups /dev/sda1 /mnt/raid6 ext4 suid,dev,exec,nodelalloc 0 0 I was able to transfer data with a sustained transfer speed of 96MB/sec from my PC to it via LAN (which is nearly the full Gigabit bandwidth) using Samba (client: Windows 7 x64 SP1). Now that I passed the 90% mark, the write speeds have dropped to a very low rate and I get random speeds in the range of 1MB/sec to 14MB/sec. At quite a few occasions Windows reports 'disk full' and the transfer is aborted; this is most annoying with large files (size>10GB) because I simply cannot transfer these anymore (they time out eventually). Dunno if it's related, but since this is not a system disk, I have reduced the reserved space to 0 (meaning that I should be able to utilize the remaining space just the same). Read speeds (no write): cs@CSNAS:~$ sudo hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 1208 MB in 3.00 seconds = 402.63 MB/sec Read speeds (write): cs@CSNAS:~$ sudo hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: 314 MB in 3.29 seconds = 95.51 MB/sec -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/791992 Title: btrfs in 2.6.38 extremely slow (when near full?) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/791992/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
