December 28, 20178 yr Hello, I am having issues copying large video files to my UNRaid shares. I have tried both FTP and SMB. What seems to happen is that the copy runs great (100+ MB/S) for a few gig before it drops down to less than 1 MB/S and stays there. I am running 1TB of SSD cache which has a little under 600GB free and 64GB of RAM. The transfers are over the same network with both machines connected to Ethernet. I have attached the diagnostic data below. Thanks! deepskyserver-diagnostics-20171228-1011.zip
December 28, 20178 yr Community Expert Is the cache being trimmed, though 1MB/s seems low even for an untrimmed SSD, if you temporarily disable cache and transfer to the array is the speed better or same?
December 28, 20178 yr Author 1 minute ago, johnnie.black said: Is the cache being trimmed, though 1MB/s seems low even for an untrimmed SSD, if you temporarily disable cache and transfer to the array is the speed better or same? The speed is much better! It copied the 3.5GB file all the way over at 112MB/S.
December 28, 20178 yr Author 25 minutes ago, johnnie.black said: Is the cache being trimmed, though 1MB/s seems low even for an untrimmed SSD, if you temporarily disable cache and transfer to the array is the speed better or same? I started another larger file transfer with no cache and it has settled at around 50 MB/S.
December 28, 20178 yr Community Expert That seems about right, initially the transfer is cached on RAM, then it's limited by the array speed.
December 28, 20178 yr Author 1 minute ago, johnnie.black said: That seems about right, initially the transfer is cached on RAM, then it's limited by the array speed. Why would it be dropping so much more dramatically when the cache is actually enabled for the share? There is plenty of space on the cache for the files to go on it first.
December 28, 20178 yr Community Expert Probably lack of trim, make sure the controller where's it's connected supports it, also it needs a balance, since there's a btrfs bug where most times only the unallocated space is trimmed.
December 28, 20178 yr Author 46 minutes ago, johnnie.black said: Probably lack of trim, make sure the controller where's it's connected supports it, also it needs a balance, since there's a btrfs bug where most times only the unallocated space is trimmed. Okay, balance is running and I will look into where the ssd is connected. I am not sure if it is connected directly t the motherboard or through one of the raid cards.
December 28, 20178 yr Community Expert 1 minute ago, Bryce said: one of the raid cards. It's on a Perc controller, very likely to not support trim.
December 28, 20178 yr Author Just now, johnnie.black said: It's on a Perc controller, very likely to not support trim. Okay, are there any options to work around this?
December 28, 20178 yr Community Expert Use the onboard SATA, change to AHCI/SATA mode if available: 00:1f.2 IDE interface [0101]: Intel Corporation 82801IB (ICH9) 2 port SATA Controller [IDE mode] [8086:2921] (rev 02) Subsystem: Dell PowerEdge R710 SATA IDE Controller [1028:0235] Kernel driver in use: ata_piix Kernel modules: ata_piix
December 28, 20178 yr Author Just now, johnnie.black said: Use the onboard SATA, change to AHCI/SATA mode if available: 00:1f.2 IDE interface [0101]: Intel Corporation 82801IB (ICH9) 2 port SATA Controller [IDE mode] [8086:2921] (rev 02) Subsystem: Dell PowerEdge R710 SATA IDE Controller [1028:0235] Kernel driver in use: ata_piix Kernel modules: ata_piix Okay I will see about getting that switched over. Thank you for your help!
Archived
This topic is now archived and is closed to further replies.