access to disk is very slow |VMware Communities

output - Why cached reads are slower than disk reads in reads the system cache, then sends it to the hard drive controller and back. This can be useful perhaps for testing SATA connections and max buffer speeds. Reads the disk without it's buffer. -T reads the system cache directly, tests processor and raid driver overhead-t reads the disk with the buffer enabled 7590 – libata: /dev/sdb slow and unstable - Timing Bugzilla – Bug 7590 libata: /dev/sdb slow and unstable - Timing buffered disk reads: 1.79 MB/sec Last modified: 2007-01-15 21:41:34 UTC performance - Disk Cached IO very slow - Server Fault Both having RAID0 (created using mdadm) over SATA disks. But I am getting different cached reads while testing using hdparm command. $ hdparm -tT /dev/sda /dev/sda: Timing cached reads: 924 MB in 2.00 seconds = 462.20 MB/sec Timing buffered disk reads: 290 MB in 3.04 seconds = 95.44 MB/sec While on the other box, hdparm: HDIO_DRIVE_CMD(identify) Failed: Inappropriate

Timing cached reads: 2 MB in 2.25 seconds = 911.91 kB/sec Timing buffered disk reads: 2 MB in 6.95 seconds = 294.62 kB/sec [root@box33 ~]# hdparm -Tt /dev/sda

sql - In Oracle what does 'Buffer Gets' actually refer to

Re: [SOLVED] Poor SSD Performance, Low Buffered Disk Reads hmmm well i tried using gdisk but my speeds remain the same, also fdisk reports the same thing as before. Here is what i did, i put gdisk in expert mode with X, used the L option to change sector alignment value, and entered 12288 as the value, then i wrote the table to the disk with w

Jul 13, 2011 · I was analyzing the Disk read using hdparm utility. This is what i got as a result. Code: # hdparm -t /dev/sda /dev/sda: Timing buffered disk reads: