Re: Benchmarks, raid0 performance, 1,2,3,4 drives

: Timing buffer-cache reads: 128 MB in 0.94 seconds =136.17 MB/sec Timing buffered disk reads: 64 MB in 1.66 seconds = 38.55 MB/sec Hope this helps sort the matter out... Scott -- Scott M. Ransom Address: Harvard-Smithsonian CfA Phone: (617) 495-4142

Re: performance limitations of linux raid

cables... Scott -- Scott M. Ransom Phone: (781) 320-9867 Address: 75 Sanderson Ave. email: [EMAIL PROTECTED] Dedham, MA 02026 PGP Fingerprint: D2 0E D0 10 CD 95 06 DA EF 78 FE 2B CB 3A D3 53

RE: performance limitations of linux raid

When doing _actual_ work (I/O bound reads on huge data sets), I often see sustained read performance as high as 50MB/s. Tests on the individual drives show 28+ MB/s. The performance is simply amazing -- even during real work (at least mine -- YMMV). And best of all, the whole set-up (Promise card +

Re: RAID0: Fast writes, Slow reads...

FIG_IDEDMA_PCI_EXPERIMENTAL=y CONFIG_BLK_DEV_PIIX=y CONFIG_PIIX_TUNING=y CONFIG_BLK_DEV_PDC202XX=y CONFIG_BLK_DEV_IDE_MODES=y Scott PS: Am now using 2.3.99-pre1 and the problem still persists... -- Scott M. Ransom Phone: (781) 320-9867 Address: 75 Sanderson Ave.

RAID0: Fast writes, Slow reads...

vents: 0004](write) hde2's sb offset: 29883584 . ... autorun DONE. Thanks a bunch, Scott -- Scott M. Ransom Address: Harvard-Smithsonian CfA Phone: (617) 495-4142 60 Garden St. MS 10 email: [EMAIL PROTECTED] Cambridge, MA 02138 PG

Re: RAID0: Fast writes, Slow reads...

he future... Scott -- Scott M. Ransom Address: Harvard-Smithsonian CfA Phone: (617) 495-4142 60 Garden St. MS 10 email: [EMAIL PROTECTED] Cambridge, MA 02138 PGP Fingerprint: D2 0E D0 10 CD 95 06 DA EF 78 FE 2B CB 3A D3 53

RAID0: Fast writes, Slow reads...

vents: 0004](write) hde2's sb offset: 29883584 . ... autorun DONE. Thanks a bunch, Scott -- Scott M. Ransom Address: Harvard-Smithsonian CfA Phone: (617) 495-4142 60 Garden St. MS 10 email: [EMAIL PROTECTED] Cambridge, MA 02138 PG