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Thread: Usual results for RAID 10
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03-10-2012, 06:26 AM #1WHT Addict
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Usual results for RAID 10
I was wondering if these were correct results, now I know it's not a valid I/O test but it gives a rough idea. It is 4 SATA drives running in software RAID 10.
Code:hdparm -tT /dev/sda /dev/sda: Timing cached reads: 6260 MB in 2.00 seconds = 3131.80 MB/sec Timing buffered disk reads: 216 MB in 3.01 seconds = 71.64 MB/sec
Code:dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync 16384+0 records in 16384+0 records out 1073741824 bytes (1.1 GB) copied, 9.81648 seconds, 109 MB/s
I have seen much much better results from other servers running RAID 10 with SATA drives.
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03-11-2012, 02:32 PM #2WHT Addict
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Anyone has any input on the matter?
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03-11-2012, 02:53 PM #3Temporarily Suspended
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What hard drives are you using?
You should be able to get 140 MB/s with newer HDDs.
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03-11-2012, 03:27 PM #4WHT Addict
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03-11-2012, 04:43 PM #5Junior Guru
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Is there running some sort of rebuild of your software raid or other i/o load?
Which model are the drives?
Just that they are new doesn't say anything about their performance:
- 5400 rpm drives
- 2.5" vs. 3.5" drives
- new drive, but still an old model
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03-11-2012, 04:45 PM #6Web Hosting Master
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That doesn't look very good. For comparison, here's a 3 year old server with 4 x 1 TB WD SATA drives (also 3 years old) in RAID10:
Code:Timing cached reads: 11028 MB in 2.00 seconds = 5520.62 MB/sec Timing buffered disk reads: 830 MB in 3.00 seconds = 276.43 MB/sec
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03-11-2012, 05:06 PM #7cout << m_subtitle;
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Here is a VM result of my personal test environment (RAID 10) with 4 normal SATA drives:
Code:1073741824 bytes (1.1 GB) copied, 6.86996 s, 156 MB/s
Code:Timing cached reads: 14094 MB in 2.00 seconds = 7055.56 MB/sec Timing buffered disk reads: 1076 MB in 3.00 seconds = 358.47 MB/sec
http://www.webhostingtalk.com/showth...55#post8005955
Yours is indeed really low as luki pointed out.
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03-12-2012, 07:45 AM #8WHT Addict
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I did think it was low and I was very disappointed when I was told it was the software RAID causing that issue.
Drive information:
Code:hdparm -I /dev/sda /dev/sda: ATA device, with non-removable media Model Number: ST3500630NS Serial Number: 9QG84ESY Firmware Revision: 3BKS Standards: Supported: 7 6 5 4 Likely used: 7 Configuration: Logical max current cylinders 16383 16383 heads 16 16 sectors/track 63 63 -- CHS current addressable sectors: 16514064 LBA user addressable sectors: 268435455 LBA48 user addressable sectors: 976773168 device size with M = 1024*1024: 476940 MBytes device size with M = 1000*1000: 500107 MBytes (500 GB) Capabilities: LBA, IORDY(can be disabled) Queue depth: 32 Standby timer values: spec'd by Standard, no device specific minimum R/W multiple sector transfer: Max = 16 Current = ? Advanced power management level: unknown setting (0xfefe) Recommended acoustic management value: 208, current value: 0 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=240ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * DOWNLOAD_MICROCODE * Advanced Power Management feature set SET_MAX security extension Automatic Acoustic Management feature set * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test * General Purpose Logging feature set * 64-bit World wide name unknown 84[11] unknown 84[12] * SATA-I signaling speed (1.5Gb/s) * SATA-II signaling speed (3.0Gb/s) * Native Command Queueing (NCQ) * Phy event counters Device-initiated interface power management * Software settings preservation Security: Master password revision code = 65534 supported not enabled not locked not frozen not expired: security count not supported: enhanced erase Checksum: correct
Code:smartctl -i /dev/sda smartctl version 5.38 [x86_64-redhat-linux-gnu] Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Model Family: Seagate Barracuda ES Device Model: ST3500630NS Serial Number: 9QG84ESY Firmware Version: 3BKS User Capacity: 500,107,862,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 7 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Mon Mar 12 01:41:52 2012 CDT SMART support is: Available - device has SMART capability. SMART support is: Enabled
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03-12-2012, 07:52 AM #9cout << m_subtitle;
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2006, is this a production server, or are you able to play with it? As I'm curious what the performance per disk is (maybe 1 is really slow, dragging the rest down with it).
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03-12-2012, 07:58 AM #10WHT Addict
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03-12-2012, 08:03 AM #11cout << m_subtitle;
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I guess it doesn't come with a KVM/IPMI device? It would be nice to just do a quick CentOS reinstall (~10 minutes) and perform some single-disk tests.
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03-12-2012, 08:08 AM #12WHT Addict
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It does on request, I'll just say it's with datashack and this is the first main 'disappointment' I've had with them and I have 7 servers. I was looking into branching out to RAID 10 and replacing the existing servers I have with new RAID 10 configurations but from what I've seen I am not so sure now.
I wouldn't be bothered to ask for KVM as I am expecting a reply from billing soon as it is now monday where I am so I assume they're just waking up.
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03-12-2012, 08:24 AM #13Newbie
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Maybe they gave you very old drives? I have a server with them and i got provisioned a drive with almost 30.000 hours with a few bad sectors, so far it works fine and i really don't care too much as im not storing important data, check the SMART report of the drives to see how healty are they.
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03-12-2012, 08:36 AM #14WHT Addict
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03-12-2012, 08:40 AM #15Web Hosting Master
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hdparm -tT /dev/sda
You are checking only 1 drive using this. To check for RAID10 , check on /dev/mdX on the / partition.
Also check whether software RAID has completed the sync
cat /proc/mdstat
For a single drive 71 MB/s is a bit low, you would generally expect ~ 100 MB/s with nothing running on it.
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03-12-2012, 08:47 AM #16Web Hosting Master
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03-12-2012, 08:53 AM #17WHT Addict
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Code:hdparm -tT /dev/md0 /dev/md0: Timing cached reads: 11772 MB in 2.00 seconds = 5892.47 MB/sec Timing buffered disk reads: 706 MB in 3.00 seconds = 235.25 MB/sec
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03-12-2012, 08:56 AM #18Web Hosting Master
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03-12-2012, 10:07 AM #19WHT Addict
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With two 10K 3GBS Sata drives in Raid 0 I see about 175 MB/s with that same DD test.
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03-12-2012, 10:12 AM #20cout << m_subtitle;
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03-12-2012, 10:15 AM #21Web Hosting Master
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