-----Original Message----- From: Eric D. Mudama [mailto:edmudama@xxxxxxxxx] Sent: Friday, December 12, 2008 5:28 AM To: Raz Ben-Yehuda Cc: Matthew Wilcox; linux-ide@xxxxxxxxxxxxxxx; linux-scsi@xxxxxxxxxxxxxxx Subject: Re: Intel X25-M MLC SSD benchmarks On 12/10/08, Raz Ben-Yehuda <razb@xxxxxxxxxxx> wrote: > All gave same results for most dd writes commands. > dd if=/dev/zero of=/dev/sda bs=1M count=1000 oflag=direct , and many > other variants such erase block size ( 128K ) , several erase block size > and so on. Kernel is 2.6.18-8.el5. > I used all on a supermicro 1025W-UR. Disks have a SAS interface, 80GB. > Also, I would like to note, I have 8 disks in array, while each one > perform READS 250 MB/s, together I degrade to 200 MB/s each. As for > writes I always reach 20 MB/s at best, from a single disk or 20x8 in > array. >>Out of curiosity, is write cache enabled or disabled on these devices? Does not matter. In both cases same low numbers. Write cache depends on the controller defaults ( Adpaptec AHCI, Intel provides different default). -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
