# To be more faster for the sftp transfer files between two AIX servers **URL:** \ **Category:** UNIX for Advanced & Expert Users\ **Created:** [May 6, 2026, 8:34am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497 "2026-05-06T08:34:25Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![LAMJED](https://community.unix.com/letter_avatar/lamjed/32/5_5575768a8748004e209b776fc1b2916d.png) [@LAMJED](https://community.unix.com/u/LAMJED)\ **Post date:** [May 6, 2026, 8:34am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/1 "2026-05-06T08:34:25Z")
sftp transfer files between tow AIX servers with a faster speed ---
**Author:** ![LAMJED](https://community.unix.com/letter_avatar/lamjed/32/5_5575768a8748004e209b776fc1b2916d.png) [@LAMJED](https://community.unix.com/u/LAMJED)\ **Post date:** [May 6, 2026, 3:36pm UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/2 "2026-05-06T15:36:45Z")
result of entstat -d ent0 : Receive Buffers Buffer Type Tiny Small Medium Large Huge Min Buffers 512 512 128 24 24 Max Buffers 2048 2048 256 64 64 Allocated 512 512 128 24 24 Registered 512 512 128 24 24 History Max Allocated 512 761 128 24 24 Lowest Registered 511 502 128 24 24 \*\* result of ifconfig ent0 : tcp\_sendspace 1048576 tcp\_recvspace 1048576 rfc1323 1 but the scp between the 2 servers is between 100KB and 300KB, Is there any other config to check ---
**Author:** ![Neo](https://community.unix.com/user_avatar/community.unix.com/neo/32/22838_2.png) [@Neo](https://community.unix.com/u/Neo)\ **Post date:** [May 7, 2026, 12:35am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/3 "2026-05-07T00:35:57Z")
> [@LAMJED](#): > > Is there any other config to check Check jumbo frames, MTU settings. ---
**Author:** ![LAMJED](https://community.unix.com/letter_avatar/lamjed/32/5_5575768a8748004e209b776fc1b2916d.png) [@LAMJED](https://community.unix.com/u/LAMJED)\ **Post date:** [May 7, 2026, 7:23am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/4 "2026-05-07T07:23:03Z")
Thank you for your reply. destination\_server ```plaintext lsattr -El en2 -a mtu mtu 1500 Taille max de paquet IP pour cette unit▒ True ``` source server ```plaintext lsattr -El en0 -a mtu mtu 1500 Maximum IP Packet Size for This Device True ping -c 3 -s 8972 -I ping -c 3 -s 8972 -I PING destination_ip (destination_ip): 8972 data bytes 8980 bytes from : icmp_seq=0 ttl=249 time=33 ms 8980 bytes from : icmp_seq=1 ttl=249 time=8 ms 8980 bytes from : icmp_seq=2 ttl=249 time=8 ms --- destination_ip ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 8/16/33 ms ping -c 3 -s 15000 -I PING destination_ip (destination_ip): 15000 data bytes 15008 bytes from : icmp_seq=0 ttl=249 time=13 ms 15008 bytes from : icmp_seq=1 ttl=249 time=12 ms 15008 bytes from : icmp_seq=2 ttl=249 time=15 ms --- ping statistics --- 3 packets transmitted, 3 packets received, 0% packet loss round-trip min/avg/max = 12/13/15 ms --- ping -c 3 -s 50000 -I PING (): 50000 data bytes --- ping statistics --- 3 packets transmitted, 0 packets received, 100% packet loss ``` ---
**Author:** ![Neo](https://community.unix.com/user_avatar/community.unix.com/neo/32/22838_2.png) [@Neo](https://community.unix.com/u/Neo)\ **Post date:** [May 7, 2026, 4:17pm UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/5 "2026-05-07T16:17:24Z")
Your interface MTU is still 1500, so those larger pings are being fragmented. That does not confirm jumbo frames are enabled end-to-end. For 100–300KB/s, I would next check: 1. Interface speed/duplex on both sides: ```sh entstat -d ent0 | egrep -i "Speed|Duplex|Media|Link" entstat -d en0 | egrep -i "Speed|Duplex|Media|Link" ``` 1. TCP retransmits/errors: ```sh netstat -s | egrep -i "retrans|timeout|duplicate|dropped|error" netstat -v ent0 ``` 1. CPU during transfer, because scp/sftp encryption can bottleneck older AIX systems: ```sh topas vmstat 1 ``` 1. Raw network test without SSH encryption, if allowed, for comparison. For example `ftp`, `nc`, or another non-encrypted transfer test. 2. Disk I/O during transfer: ```sh iostat -Dl 1 ``` If raw network transfer is fast but scp/sftp is slow, the bottleneck is probably SSH cipher/CPU.. ---
**Author:** ![vbe](https://community.unix.com/user_avatar/community.unix.com/vbe/32/266_2.png) [@vbe](https://community.unix.com/u/vbe)\ **Post date:** [May 11, 2026, 10:56am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/6 "2026-05-11T10:56:57Z")
You have not mentioned if you were using a dedicated private lan for this purpose: When I was still working, all my servers (AIX, HP-UX, SOLARIS) were configured with a minimum of 2 networks, the second called technical, for backups and fast transfer, because very difficult to get good performance on production Lan where users and DB request compete with high data volume... ---
**Author:** ![vbe](https://community.unix.com/user_avatar/community.unix.com/vbe/32/266_2.png) [@vbe](https://community.unix.com/u/vbe)\ **Post date:** [May 15, 2026, 7:59am UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/7 "2026-05-15T07:59:30Z")
Reading again, this thread, I realise also that you describe not the purpose, you have not said if you had an issue, nor most importantly, and I would guess, you concern, what /how much you wish to transfer, could be useful to know also, at which interval, depending on what you are trying, there may be better and faster alternatives to scp/sftp which are at file level commands designed as such... ---
**Author:** ![MadeInGermany](https://community.unix.com/letter_avatar/madeingermany/32/5_5575768a8748004e209b776fc1b2916d.png) [@MadeInGermany](https://community.unix.com/u/MadeInGermany)\ **Post date:** [May 15, 2026, 5:40pm UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/8 "2026-05-15T17:40:04Z")
IMHO this is the issue: > [@LAMJED](#): > > but the scp between the 2 servers is between 100KB and 300KB, If this is 100-300 KByte per second, about 2Mbit/sec, even with an old 100Mbit NIC you can expect more. I remember an auto-negotiation problem between LAN switch and unpatched Sun-Sparc-Solaris boxes. (And the required NIC patch was not in the "recommended patches".) So, in addition to the previous suggestions, the actual NIC speed and the simplex/duplex value should be checked! ---
**Author:** ![system](https://community.unix.com/uploads/default/original/2X/c/c7e9e16a595259edafe88615719d5c5dcda035c2.png) [@system](https://community.unix.com/u/system)\ **Post date:** [July 14, 2026, 5:40pm UTC](https://community.unix.com/t/to-be-more-faster-for-the-sftp-transfer-files-between-two-aix-servers/397497/9 "2026-07-14T17:40:31Z")
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