Papa_TJ Posted April 6, 2019 Share Posted April 6, 2019 Hello all, I'm fairly new to Unraid, I purchased my license last year set it up and turned it off until recently as my single drive 4 tb NAS solution is running out of drive space. I know this topic has been covered but none of the resolutions that I have found have worked for me. I am running Unraid Version 6.5.3 on an amd x6 with 16gig of ram a 256 gig sdd cache drive, 1ea 3tb parity drive, 4ea 3 tb storage drives and a 1.5 tb storage drive. gigabit Ethernet. 11.7tb of free space. my drives are all SATA 3 -6 Gig my problem is write speeds. I built this server mainly to store my digital movie collection so the files range in size from 2 to 20 gigs each. when I copy the 2 gig files to the server the transfer at a rate of 110 or so MBs. I would expect this as this pretty much maxes out my gigbit network speed. when I transfer a 6 gig file to the server I get 110 MBs transfer speed for about 4 gig and then it drops to 45 MBs. I have looked at the write cache with hdparm and all write chaches are active or on. this reminds me of the old days using novel 3 track when my dirty cache buffer max out right before the network slowed to a crawl. I have also done a read test on the drive using hdparm and they all read 150MBs or better. I didnt see a way to do a write test with hdparm but I have had a couple of these drives in my desktop and transfering at 120MBs from drive to drive was never a problem. I have tried both using the cache drive and writing to the main disks with the same results. here is the parameters from one of my drives they all pretty much look the same. # hdparm -I /dev/sdd /dev/sdd: ATA device, with non-removable media Model Number: WL3000GSA6454 1 Serial Number: P8HVL2JR Firmware Revision: MJ8OA5F0 Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0; Revision: ATA8-AST T13 Project D1697 Revision 0b Standards: Used: unknown (minor revision code 0x0029) Supported: 8 7 6 5 Likely used: 8 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: 5860533168 Logical Sector size: 512 bytes Physical Sector size: 4096 bytes Logical Sector-0 offset: 0 bytes device size with M = 1024*1024: 2861588 MBytes device size with M = 1000*1000: 3000592 MBytes (3000 GB) cache/buffer size = unknown Form Factor: 3.5 inch Nominal Media Rotation Rate: 7200 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 = 0 Advanced power management level: disabled 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=120ns 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 * NOP cmd * DOWNLOAD_MICROCODE Advanced Power Management feature set Power-Up In Standby feature set * SET_FEATURES required to spinup after power up SET_MAX security extension * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test Media Card Pass-Through * General Purpose Logging feature set * WRITE_{DMA|MULTIPLE}_FUA_EXT * 64-bit World wide name * URG for READ_STREAM[_DMA]_EXT * URG for WRITE_STREAM[_DMA]_EXT * WRITE_UNCORRECTABLE_EXT command * {READ,WRITE}_DMA_EXT_GPL commands * Segmented DOWNLOAD_MICROCODE * unknown 119[7] * Gen1 signaling speed (1.5Gb/s) * Gen2 signaling speed (3.0Gb/s) * Gen3 signaling speed (6.0Gb/s) * Native Command Queueing (NCQ) * Host-initiated interface power management * Phy event counters * NCQ priority information Non-Zero buffer offsets in DMA Setup FIS DMA Setup Auto-Activate optimization Device-initiated interface power management In-order data delivery * Software settings preservation * SMART Command Transport (SCT) feature set * SCT Write Same (AC2) * SCT Error Recovery Control (AC3) * SCT Features Control (AC4) * SCT Data Tables (AC5) Security: Master password revision code = 65533 supported not enabled not locked not frozen not expired: security count supported: enhanced erase more than 508min for SECURITY ERASE UNIT. 2min for ENHANCED SECURITY ERASE UNIT. Logical Unit WWN Device Identifier: 5000cca22cda2d07 NAA : 5 IEEE OUI : 000cca Unique ID : 22cda2d07 Checksum: correct attached are the images of the transfer speed dropping off with pushing files to the server and an image of the file coming back to my desktop with no transfer speed dropoff. any ideas? Link to comment
JorgeB Posted April 6, 2019 Share Posted April 6, 2019 11 minutes ago, Papa_TJ said: when I transfer a 6 gig file to the server I get 110 MBs transfer speed for about 4 gig and then it drops to 45 MBs. This is normal and expected for default writing mode, see turbo write. Link to comment
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