May 30, 201214 yr I have installed unRAID and copied my data across one disk at a time. All transfers are internal (sata to sata) and nothing is going through the network. Using Windows 7 (was installed on sda) copying from disk sdc/d/f/g/h/i (one disk at a time) -> disk sdb gave me 90mb/s. Using unRAID copying from disk sdb -> disk sdc/d/f/g/h/i gives me 20mb/s. Now I have added sdb as the parity drive and its only syncing @ 20mb/s. Is this normal for unRAID? Am I limited to only 20mb/s ? Specs of the pc: unRAID 5.0rc3 Asus AT5NM10-I with atom dual core d525 @ 1.8ghz cpu 1 x 2gb ddr2 ram Supermicro AOC-SAT2-MV8 in PCI slot CACHE ST31500341AS (sda) - Not yet added PARITY ST31500341AS (sdb) - Currently syncing disk1 ST31000528AS (sdc) disk2 ST31000528AS (sdd) disk3 ST31000528AS (sdf) disk4 ST31000528AS (sdg) disk5 ST31000528AS (sdh) disk6 ST31000528AS (sdi) Cache and Parity drive are connected to sata ports on motherboard. disk1-6 are connects to the supermicro card on pci slot. I have tweaked the bios by enabling ahci on the sata port and disabling audio/serial/parallel ports. I only caught the HPA errors after disk1-5 was added. Will need to fix this later. I have attached the syslog. Any help would be much appreciated ! syslog-2012-05-30.txt
May 30, 201214 yr Author Just did a read speed test with the array stopped. root@Files:~# hdparm -tT /dev/sd[a-i] /dev/sda: Timing cached reads: 1900 MB in 2.00 seconds = 950.69 MB/sec Timing buffered disk reads: 372 MB in 3.01 seconds = 123.44 MB/sec /dev/sdb: Timing cached reads: 1866 MB in 2.00 seconds = 932.90 MB/sec Timing buffered disk reads: 376 MB in 3.01 seconds = 124.99 MB/sec /dev/sdc: Timing cached reads: 1916 MB in 2.00 seconds = 958.16 MB/sec Timing buffered disk reads: 282 MB in 3.01 seconds = 93.83 MB/sec /dev/sdd: Timing cached reads: 1954 MB in 2.00 seconds = 977.16 MB/sec Timing buffered disk reads: 282 MB in 3.01 seconds = 93.61 MB/sec /dev/sde: Timing cached reads: 1918 MB in 2.00 seconds = 959.16 MB/sec Timing buffered disk reads: 52 MB in 3.11 seconds = 16.73 MB/sec /dev/sdf: Timing cached reads: 1916 MB in 2.00 seconds = 957.75 MB/sec Timing buffered disk reads: 282 MB in 3.01 seconds = 93.71 MB/sec /dev/sdg: Timing cached reads: 1904 MB in 2.00 seconds = 952.68 MB/sec Timing buffered disk reads: 272 MB in 3.01 seconds = 90.31 MB/sec /dev/sdh: Timing cached reads: 1918 MB in 2.00 seconds = 959.51 MB/sec Timing buffered disk reads: 284 MB in 3.01 seconds = 94.21 MB/sec /dev/sdi: Timing cached reads: 1918 MB in 2.00 seconds = 959.49 MB/sec Timing buffered disk reads: 308 MB in 3.00 seconds = 102.60 MB/sec
May 30, 201214 yr Author Disk Performance from unmenu. Rebuilding Parity Total Size 1,465,138,552 KB Current 57,871,832 (3.9%) Speed 19,920 KB/sec Finish 1173 minutes Sync Errors 0 (corrected) From: bwm-ng -o html -T avg -R 1 -i disk -c 1 -I sdb,sdc,sdd,sdf,sdg,sdh,sdi,,,,,,,,,,,,, -H bwm-ng bwm-ng v0.6 (refresh 1s); input: disk IO Device Read Write Total sdb: 0.00 KB/s 10219.56 KB/s 10219.56 KB/s sdc: 10219.56 KB/s 0.00 KB/s 10219.56 KB/s sdd: 10219.56 KB/s 0.00 KB/s 10219.56 KB/s sdf: 10219.56 KB/s 0.00 KB/s 10219.56 KB/s sdg: 10219.56 KB/s 0.00 KB/s 10219.56 KB/s sdh: 10199.20 KB/s 0.00 KB/s 10199.20 KB/s sdi: 10199.20 KB/s 0.00 KB/s 10199.20 KB/s total: 61195.22 KB/s 10199.20 KB/s 71394.42 KB/s
May 30, 201214 yr Author PCI bus should give me up to 133mb/s (lets say 100mb/s after overheads). Doesn't really explain why I was getting 90mb/s in Windows 7 and then 20mb/s in unRAID. All I did was: - boot Windows 7 - Copy all files from one drive pci sata card to one drive on motherboard sata ( 3 hours ) - Shutdown & plug in usb with unRAID - boot unRAID - Copy all files from same drive on motherboard sata to same drive on pci sata ( 12 hours ) Anyway I deleted the parity drive and did a write speed test on all drives. root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk/parity/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 120.361 s, 34.8 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk1/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 132.024 s, 31.8 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk2/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 130.625 s, 32.1 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk3/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 135.369 s, 31.0 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk4/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 130.846 s, 32.1 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk5/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 131.927 s, 31.8 MB/s root@Files:/mnt/disk/parity# dd if=/dev/zero of=/mnt/disk6/test.dd count=8192000 8192000+0 records in 8192000+0 records out 4194304000 bytes (4.2 GB) copied, 169.459 s, 24.8 MB/s The write speeds above seem slow at 30mb/s. Especially the parity drive which is plugged in to the sata port on the motherboard. It can't be the PCI bus slowing this down as the drives were doing >90mb/s reading.
May 30, 201214 yr Those are timings of individual drive. During a party check all drives are read in parallel. So it it 100/6 = 16.66MBps. 20MBps is very good.
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