On a test server: 1. Play with the hdparm utility - there are some cryptic settings and performance tests. Use 32 bit transfers (sometimes the OS resets to PIO/16 bits on bootup). 2. Invest in a PCI disk controller (tweak and benchmark the hardware first) 3. CPU load of 5-6 will give you unacceptable response times - for all processes 4. Remove all unnessary software from the servers 5. Is the response time problem due to user complaints or just observations based on a test file move?
tedc -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lars Schimmer Sent: Saturday, March 12, 2005 3:57 AM To: [email protected] Subject: [OpenAFS] Speed of AFS, continue... -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi! I'm kinda frustrated. Network: AFS database server on 1.2.13 on PII, no more than database server on it Fileserver 1 on debian sarge kernel 2.6.9 OpenAFS 1.3.74 Fileserver 2 on debian sarge kernel 2.6.8 OpenAFS 1.3.79 The network between these three is 100MBit fullduplex full switched, yes, I controlled this. The PII has the HD on PIO mode, but for a database server, that is OK, or? The other both fileservers has IDE 5400UPM HDs with UDMA5 mode. Fileserver 1 has one system HD and 2 HDs for /vicepa and /vicepb Fileserver 2 has only one HD with system, data and /vicepa AFS Cache on FS1 is disk, on FS is memcache. No I have got two volumes, source on FS1, target on FS2, both mounted in one dir. I looged in on FS2 and try to copy two 2 GB files from the dir (mounted on volume on FS1) into the dir mounted on the volume on FS2. Speed is ONLY 2 MB/sec maximum and the FS2 is really under load, load of 5-6, nearly latency of 1 sec while typing on another shell on it, but CPU isn't much crowded, I have a dnetc (distributed.net) on nice level on it, top tells me, most time, the dnetc got >50% of CPU. Oh, both fileservers are Athlon 2 GHz on VIA 333 chip-based boards. Is AFS really so slow? Or which switch have I forgot to set? If I try to copy from FS1 to my workstation (both same machines), I got 4-5 MB/sec over the net... A bit faster, but NOT as near as line speed. What can I try to speed it up? Cya Lars - -- - ----------------------------------------------------------------- Technische Universit�t Braunschweig, Institut f�r Computergraphik Tel.: +49 531 391-2109 E-Mail: [EMAIL PROTECTED] PGP-Key-ID: 0xB87A0E03 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.5 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFCMtjyVguzrLh6DgMRAudYAJ93TI5kAQAX97Biwwj7TV7gkjtn9ACgschp ogrbqj+wQWn3WubBJ0ebf5A= =Eb33 -----END PGP SIGNATURE----- _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info _______________________________________________ OpenAFS-info mailing list [email protected] https://lists.openafs.org/mailman/listinfo/openafs-info
