Excessive IO wait with megaraid card
Phil Bettinson <[email protected]>
| Newsgroups | gmane.linux.redhat.release.taroon.general |
|---|---|
| Message-ID | <[email protected]> |
Hello List, We have a (4) sun v40z's here to run some oracle databases. They have 6 HD's in a hardware raid off of a LSI Logic MegaRAID 413Y (as cleaned from /proc/scsi/megaraid/1) Performance is fine doing it's main job (serving about 6 Lightly used Oracle databases). We are finding, however, that should you attempt to run a large tar job on the system, all four of the quad opteron processors end up stuck with 100% IO wait (when tarring say about a 4gb oracle database). We've tried using the megaraid2 driver which did improve things a bit, the system is a little more responsive during the tar, but not by much. Does anyone have any ideas? Either how we narrow down the problem/get more info, or (ideally ;)) a fix to our rather annoying problem? It seems to appear on all four boxses, using RHEL U7 (installed with U0, but up2dated), and using redhat-made drivers. Thanks. Phil -- ----------------------------------------------------------------------- Phil Bettinson BEng, RHCT Beng, RHCT Swyddog Gweinyddu Systemau Systems Administrator Isadran Cyfrifiaduron Computer Section Llyfrgell Genedlaethol Cymru National Library of Wales Aberystwyth, Aberystwyth Ceredigion, Ceredigion SY23 3BU SY23 3BU Ffôn / Phone: 01970 632867 Ffacs / Fax: 01970 615709 EBost / Email: [email protected] We / Web: http://www.llgc.org.uk ----------------------------------------------------------------------- Yn siarad drosof fy hun, nid LlGC - Speaking personally, not for NLW -- Taroon-list mailing list [email protected] https://www.redhat.com/mailman/listinfo/taroon-list