Yaoxing put forth on 12/23/2010 4:45 AM: > Is this what you're talking about?
Yes. > Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn > sda 148.63 27.55 6550.60 523033469 124353201092 > sda1 0.00 0.00 0.00 2524 116 > sda2 148.63 27.55 6550.59 523027626 124353101816 > sda3 0.00 0.00 0.01 2895 99160 This shows 148 transactions per second to device sda. The average max IOPS for any vendor's 7.2k rpm drive is ~150, a 15k drive hits ~300. Your spool appears to be on partition sda2. You are hitting the maximum IOPS capability of that drive if it is a 7.2k drive. If it is a 7.2k drive, it would seem you need more spindles or an SSD. I arrived at the 600 subscriber limit by multiplying 150 IOPS by 4 seconds, which is the interval you stated for successive mailings. The result is 600 subscribers maximum before exceeding the IOPS capability of that drive. -- Stan
