On 1/29/2015 4:50 AM, Gordon Messmer wrote:
On 01/28/2015 04:32 AM, Jatin Davey wrote:
Could someone point me on how to improve the disk I/O on my server and
reduce the wait time on I/O.
Start by identifying your disk and controller. Assuming that this is
a single SATA disk:
# smartctl -a /dev/sda | egrep 'Model:|Rate:|SATA Version'
[Jatin]
[root@localhost images]# smartctl -a /dev/sda | egrep 'Model:|Rate:|SATA
Version'
[root@localhost images]#
# lspci | grep SATA
[Jatin]
[root@localhost images]# lspci | grep SATA
00:11.4 SATA controller: Intel Corporation Wellsburg sSATA Controller
[AHCI mode] (rev 05)
00:1f.2 SATA controller: Intel Corporation Wellsburg 6-Port SATA
Controller [AHCI mode] (rev 05)
Next install and run iotop. If there's something on your system
that's particularly active and unnecessary, disable it.
If everything contending for your disk *is* necessary, then you may
need to take steps to improve disk performance. There are a number of
possibilities.
1: Use an SSD instead of a disk.
2: Use an SSD in addition to a disk. If a purely SSD storage system
is too expensive, you might choose to use an SSD for one or more
filesytems that you can mount where the high volume IO is occurring,
and continue to use the disk for filesystems that need more data
capacity and fewer IOPS.
[Jatin]
Thanks for these inputs. I will surely take it up with my team to see if
we can incorporate new hardware for our product.
3: Use a fast RAID array. A RAID1 array can provide better read
performance than a single disk. For higher write volumes, use RAID10
on four or more disks. Avoid RAID 5 or 6, as they'll be slower than a
single disk.
[Jatin]
We are using RAID 10 in our server with 4 disks.
4: Replace poorly supported hardware. It might be that your SATA
controller isn't well supported, and performs badly as a result. I
used to have a desktop system with NVidia motherboard chipset. Its
SATA controller was garbage. Performance with the same disk was
noticeably better with a cheap PCI-E SATA controller.
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Hi Gordon
Please see my responses inline to your questions.
Appreciate your inputs in this direction.
Thanks
Jatin
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