michael123

Makes me wonder as well.. Are there any jumpers I missed?

limetech I do not understand yet the 300% write throughput difference between my system (which is the best Lime Tech could offer, 4GB RAM, CPU upgraded btw) and the one of Henris(?) Is it because of my drive? But Tom apprved them.. Yes, they are quite, but at which cost??

Thanks. That's what I will do probably. Again, which drive is the fastest for writes under 200$?

So, what is better - upgrading parity drive or adding cache drive or.. both? Which 1.5TB/2TB drives are considered to give best stability and performance (under 200$)?

Why are there some unknown fields, like BuffType=unknown and Drive conforms to: Unspecified: ?? I got the pre-built system without drives. I asked Tom regarding this model of the disks (this is what my localshop had in stock), and Tom confirmed that they are OK. Frankly, I do not perform many 'writes' on the array, which are mostly taken off-line. So, do you think that if I buy faster parity drive, I will get better writer performance? Which model can you recommend? (I need either 1.5TB or 2TB) Do you think if Seagate Barracuda 7200.11 (1.5TB 7200 RPM, 32MB Sata II) ST31500341AS? will be better than WD?

This is the info of 'disk4': root@VAULT:~# hdparm -i /dev/sdf /dev/sdf: Model=WDC WD15EADS-00P8B0 , FwRev=01.00A01, SerialNo= WD-WMAVU0068527 Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=50 BuffType=unknown, BuffSize=32767kB, MaxMultSect=16, MultSect=?16? CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=18446744072344861488 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120} PIO modes: pio0 pio3 pio4 DMA modes: mdma0 mdma1 mdma2 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 AdvancedPM=no WriteCache=enabled Drive conforms to: Unspecified: ATA/ATAPI-1,2,3,4,5,6,7 * signifies the current active mode

I get an error root@VAULT:~# hdparm -i /dev/sda /dev/sda: HDIO_GET_IDENTITY failed: Invalid argument root@VAULT:~# My drives are http://www.wdc.com/en/products/products.asp?driveid=575

so why do I have so low write rate?

henris thank you for your benchmarking tips, it was very helpful as I am not a Linux guy What I received is following ***READ *** root@VAULT:~# dd if="/mnt/disk3/Movies/Music/Test.mkv" of=/dev/null 73184338+1 records in 73184338+1 records out 37470381528 bytes (37 GB) copied, 609.037 s, 61.5 MB/s *** WRITE *** root@VAULT:~# dd if="/mnt/disk3/Movies/Music/Test.mkv" of=/mnt/disk4/Movies/Rush.mkv 73184338+1 records in 73184338+1 records out 37470381528 bytes (37 GB) copied, 3073.51 s, 12.2 MB/s Does it mean that the these WD disks just have poor write performance?

Hi just installed and get these errors: I have unRAID Server Pro 4.4.2 VAULT login: root Linux 2.6.27.7-unRAID. root@VAULT:~# /boot/smart/smarthistory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory smartctl: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory No alerts from Smarthistory. 1 device(s) active, 4 sleeping, 1 did not return SMART data. root@VAULT:~#

Thanks I added your script

yes, of course, all equipment is 1000Mbos I have 50MB/sec read rate. Only write performance is poor.. and directory access I will add "cache_dirs -w" to the go script, and see if that helps for the directory access (it should, right?) I have 4GB on my storage box, so I believe I shall not add any other constraints, just cache everything..

VAULT login: root Linux 2.6.27.7-unRAID. root@VAULT:~# ifconfig eth0 Link encap:Ethernet HWaddr 00:30:48:b0:ad:08 inet addr:192.168.3.102 Bcast:192.168.3.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3287130583 errors:0 dropped:0 overruns:0 frame:0 TX packets:1123489433 errors:0 dropped:46 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3299461697 (3.0 GiB) TX bytes:2256782712 (2.1 GiB) Interrupt:219 Base address:0xa000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:31 errors:0 dropped:0 overruns:0 frame:0 TX packets:31 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6432 (6.2 KiB) TX bytes:6432 (6.2 KiB) root@VAULT:~# BTW, why the directory is so slow? I had 4GB installed by Tom, shall not all the files to reside in RAM? How can I speed up opening the directory? S-L-O-W!!

I have more powerful hardware (LIME system with all available upgrades), but the speed rate I receive is exactly the same if I am writing direct to the disk or through share.. What I do is writing 500MB file once to \\server\disk1\share and 2nd time to \\server\share in both cases it is somewhere between 10MB/sec and 12MB/sec.. Something wrong.. Read rate is quite good, though. unRAID OS is (I assume) the latest one

What write rate you get eventually if you write directly to \\server\diskN ? I just tried, and I basically get the same thing: 10.5MB/sec instead of 10MB/sec

Kaygee what do you do if the share splits across few disks?

No, I do not want RAID-5, I am well aware of the benefits of unRAID. I read about cache disk.. It looks to me like a hole. I do want the data to be unprotected not for a fraction of time, Is there anything else I can do to improve the disk writes?

Why unRAID can't calculate parity asynchronously? I got this CPU and Memory upgrade.. How these are used? Also, I noticed that the directory read is very slow as well, it takes 5-8 seconds. Is not it cached on OS level?

..this still does not justify the speed I get on read & write 10 MB/sec is awfully, and unexpectedly slow Every appliance like QNap does much, much better

Thanks, although these are sad news - Where can I read more about the cache disk? - Which parity drive can you recommend?

The disks are WD 1.5TB IntelliPower, 32MB SATA II WD15EADS http://www.tomshardware.com/reviews/1.5tb-hdd-caviar,2331-2.html How can I improve performance? Both read & write?

Hi I got few weeks ago a server from Tom MD-1510/LL + CPU & 4GB Memory upgrade My internal network is 1000MBps and ping completes in <1ms Still, read rate I get is 46 MB/sec, and writing is merely 10 MB/sec. I have 4 x 1.5TB Western Digital disks for data + 1 x 1.5TB for parity Each disk has 100 MB/sec read rate. What is wrong with the system? Why is it so slow? Where can I see CPU, Memory, Network, Disk utilization as well as some other diagnostics on Lime server? Can I see it through Web interface? It is quite an expensive system for home use, so I am a bit frustrated -- Michael