Every few months PowerEdge with SSD (INTEL SSDSA2BW60) comes with results like:
hdparm -tT /dev/sda
/dev/sda: Timing cached reads: 690 MB in 2.00 seconds = 344.84 MB/sec Timing buffered disk reads: 170 MB in 3.00 seconds = 56.59 MB/sec 100000+0 records in 100000+0 records out 819200000 bytes (819 MB) copied, 66.0552 s, 12.4 MB/s
These are on system with all services taken down in order not to interfere with hdparm. After few hours everything comes to normal disk speeds and behaviour can not be reproduced. Is there some known problem with Dell machines, or Intel SSD drives?
Relevant parts from
Linux version 2.6.32-358.11.1.el6.x86_64 (firstname.lastname@example.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Wed Jun 12 03:34:52 UTC 2013 DMI: Dell Inc. PowerEdge R720/0XH7F2, BIOS 1.6.0 03/07/2013 scsi0 : LSI SAS based MegaRAID driver scsi 0:0:0:0: Direct-Access DELL PERC H710 3.13 PQ: 0 ANSI: 5 scsi 0:2:0:0: Direct-Access DELL PERC H710 3.13 PQ: 0 ANSI: 5 sd 0:2:0:0: [sda] 1170997248 512-byte logical blocks: (599 GB/558 GiB) sd 0:2:0:0: [sda] Write Protect is off sd 0:2:0:0: [sda] Mode Sense: 1f 00 00 08 sd 0:2:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: sda1 sda2 sda3 sd 0:2:0:0: [sda] Attached SCSI disk