Is this a bug? Hardware RAID5 9650SE reports 100MB/Sec

[mbze430]

I have a hardware created RAID5 with 5 drives, the Read performance is horrible, at best 60MB/sec doing a 'dd' if/of test. So I have been looking around and I caught this in the Diagnostics|Information|Disks.

it shows this:

Code: Select all

Device	Device model	Description	Size	Serial number	Rotation rate	Transfer rate	S.M.A.R.T.	Controller	      oller model	Temperature	Status
da2	 	n/a 	                                 11444048MB	n/a 	               n/a 	        100.000MB/s 	Unavailable 	twa0 	3ware 9000 series Storage Controller 	n/a 	ONLINE 

Transfer rate = 100.000MB/s

Now I am wondering if this has anything to do with my super slow READ rate.

[crowi]

How did you configure the drives?

[mbze430]

I created the RAID5 set in the 3Ware BiOS, using all the default settings. after, boot in the NAS4Free it formatted it using UFS. thats all I did.

[raulfg3]

try configure disk as individual ones in BIOS and create a RaidZ1 (simmilar to Raid5 for your pourpouses), you notice a speed improvement.

[substr]

maybe the read cache isn't on.

[mbze430]

try configure disk as individual ones in BIOS and create a RaidZ1 (simmilar to Raid5 for your pourpouses), you notice a speed improvement.

I tried doing a RAIDZ1 but I keep getting a "error code 1" and so i gave up. I am waiting for a few drives right now, so once I can move over the data I will attempt RAIDZ1 again

[mbze430]

maybe the read cache isn't on.

Code: Select all

# tw_cli /c0 show

Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache  AVrfy
------------------------------------------------------------------------------
u0    JBOD      OK             -       -       -       2794.52   Ri     OFF
u1    JBOD      OK             -       -       -       232.831   Ri     OFF
u2    RAID-5    OK             -       -       256K    11175.8   RiW    ON

VPort Status         Unit Size      Type  Phy Encl-Slot    Model
------------------------------------------------------------------------------
p2    OK             u2   2.73 TB   SATA  2   -            ST3000DM001-9YN166
p3    OK             u2   2.73 TB   SATA  3   -            ST3000DM001-1E6166
p4    OK             u2   2.73 TB   SATA  4   -            ST3000DM001-1E6166
p5    OK             u2   2.73 TB   SATA  5   -            ST3000DM001-1E6166
p6    OK             u2   2.73 TB   SATA  6   -            ST3000DM001-1E6166
p7    OK             u0   2.73 TB   SATA  7   -            TOSHIBA DT01ACA300
p8    OK             u1   232.83 GB SATA  8   -            WDC WD2500AAJS-75M0

Name  OnlineState  BBUReady  Status    Volt     Temp     Hours  LastCapTest
---------------------------------------------------------------------------
bbu   On           Yes       WeakBat   OK       OK       255    22-Nov-2014

Below is a summary of the possible settings in that column:

W - only the write cache is enabled
Rb - only read cache Basic is enabled
Ri - only read cache Intelligent is enabled
RbW - read cache Basic and write cache are both enabled
RiW - read cache Intelligent and write cache are both enabled
OFF - all read and write caches are disabled

[mbze430]

are there any "settings" in NAS4Free to change the Transfer Rate? Because my Intel Pro 1000 MT only worked at 100mbits till I changed it from AUTO to 1000mbits in the setting... maybe something like that needs to be done?

How does NAS4Free determine this "Transfer Rate"?

[mbze430]

Code: Select all

Write Test:
# dd if=/dev/zero of=/mnt/movies02/test.dd bs=2M count=10000
10000+0 records in
10000+0 records out
20971520000 bytes transferred in 129.786322 secs (161584978 bytes/sec)

Read Test:

# dd if=/mnt/movies02/test.dd of=/dev/null bs=2M count=10000
10000+0 records in
10000+0 records out
20971520000 bytes transferred in 241.270014 secs (86921369 bytes/sec)

as you can all see the WRITE is faster than READ which makes absolutely no sense in a RAID5 configuration.

[substr]

Try using the Rb read cache setting and see if anything improves. Also try reducing the block size to 256K or 512K on the read test.

[Stefan75]

long time ago, but maybe your raid controller wasn't using the correct PCIe x4/8 mode