HiSoC8Y Posted August 5, 2012 Share Posted August 5, 2012 Hi i'm about to buy this, 8 of them, but want to know what is the expected read and write speed of it? the model is ST3000DM001 thanks Link to comment
Helmonder Posted August 5, 2012 Share Posted August 5, 2012 Write speed (except for the cachedrive) is highly dependant on the unraid processes, speed of the disk will never be the bottleneck. Link to comment
Frank1940 Posted August 5, 2012 Share Posted August 5, 2012 Hi i'm about to buy this, 8 of them, but want to know what is the expected read and write speed of it? the model is ST3000DM001 thanks I have two of these in my array and the parity check completes in less than seven hours. This drive is one of the fastest 3TB ones you can get. Why are you asking the question? If read/write speeds is critical to you, unRAID may not be the solution you are looking for. Link to comment
HiSoC8Y Posted August 5, 2012 Author Share Posted August 5, 2012 read/write not a major concern, but just want to know the expected read/write. can you share? Link to comment
marcusone Posted August 5, 2012 Share Posted August 5, 2012 I have a 3x3tb system setup and parity sync goes at 180ish or more (at least at the start) don't recall the final average at the end. But its fast. Sent from my SGH-I727R using Tapatalk 2 Link to comment
Frank1940 Posted August 5, 2012 Share Posted August 5, 2012 read/write not a major concern, but just want to know the expected read/write. can you share? It varies. When writing a 25GB blu-ray ISO file, it typically starts around 80MBps and slowly drops into the 20 to 30MBps range. When copying data files (mostly small files) the speed seldom reaches 20MBps. I suspect that there is considerable overhead when creating the directory entries with small files. Remember, I have 6GB of RAM and I understand that a portion of it is used as a cache for write operations. As was stated by a previous poster, the speed of the hard drives is not the major determining factor in disk IO when using unRAID. However, disk speed will a much bigger factor when parity checking, parity correcting, and disk rebuilding operations are running. The reason for this is simple: A read operation only involves ONE disk. A write operation only involves two disks-- parity and the disk the data is stored on. The parity operations involve ALL of the disks in the array. Hope this helps... Link to comment
Johnm Posted August 5, 2012 Share Posted August 5, 2012 I ran a speed report for Goliath (virtual server on atlas) It is a mix of Hitachi LP's and Seagate ST3000DM001's the ST3000DM001 reports as a 9YN166 sdb = 9.72 MB/sec usb-Lexar_JD_FireFly sdc = 186.09 MB/sec 9YN166 sdd = 119.20 MB/sec Hitachi_HDS5C3030ALA630 sde = 166.84 MB/sec 9YN166 sdf = 114.72 MB/sec Hitachi_HDS5C3030ALA630 sdg = 175.19 MB/sec 9YN166 sdh = 112.25 MB/sec Hitachi_HDS5C3030ALA630 sdi = 122.82 MB/sec Hitachi_HDS5C3030ALA630 sdj = 125.28 MB/sec Hitachi_HDS5C3030ALA630 sdk = 104.36 MB/sec Hitachi_HDS5C3030ALA630 sdl = 118.08 MB/sec Hitachi_HDS5C3030ALA630 sdm = 114.54 MB/sec Hitachi_HDS5C3030ALA630 sdn = 111.43 MB/sec Hitachi_HDS5C3030ALA630 sdo = 112.96 MB/sec Hitachi_HDS5C3030ALA630 sdp = 118.56 MB/sec Hitachi_HDS5C3030ALA630 sdq = 119.82 MB/sec Hitachi_HDS5C3030ALA630 sdr = 166.07 MB/sec 9YN166 sds = 169.03 MB/sec 9YN166 (Parity) sdt = 152.24 MB/sec 9YN166 as you can see there s a big performance boost in the seagate over the Hitachi. about 50MB/sec difference. then again. the Hitachi is a 5400 RPM 5 platter beast and the Seagate is is a 7200 RPM 3 platter high density monster. hard to compare fairly. keep in mind, this is raw disk performance on the live server with other things using the server. this is not what you will get over the wire and this is without parity overhead... Link to comment
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