Re: Very slow disk I/O

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On 2/2/2015 10:32 AM, John R Pierce wrote:
On 2/1/2015 8:25 PM, Jatin Davey wrote:

On 2/2/2015 9:25 AM, John R Pierce wrote:
On 2/1/2015 7:31 PM, Jatin Davey wrote:

I ran your script and here is the output for it:

Start of the Output***************************
[root@localhost bin]# lsi-raidinfo
sh: /opt/MegaRAID/MegaCli/MegaCli64: No such file or directory
-- Controllers --

as I said, you need to install the MegaCli software from LSI so you can manage the raid card.
I am using a server which has a Cisco 12G SAS Modular Raid Controller , So wondering if software from LSI would work on it. Please correct me if am wrong.


[root@localhost ~]# lspci | grep RAID
05:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS-3 3108 [Invader] (rev 02)

thats a LSI Logic Megaraid 3108 chip. This is used on the LSI 9361-8i and many other OEM rebranded cards. If cisco has their own package of the megacli management software, then sure, use that.

Hi John

I managed to install the software from LSI on my box and ran the script that you had provided and here is what i get from it.

************Output ******************
[root@localhost bin]# lsi-raidinfo
-- Controllers --
-- ID | Model
c0 | Cisco 12G SAS Modular Raid Controller

-- Volumes --
-- ID | Type | Size | Status | InProgress
volume c0u0 | RAID10 2x2 | 1816G | Optimal | None

-- Disks --
-- Encl:Slot | vol-span-unit | Model | Status
disk 252:1 | 0-0-0 | 9XG7TNQVST91000640NS CC03 | Online, Spun Up
disk 252:2 | 0-0-1 | 9XG4M4X3ST91000640NS CC03 | Online, Spun Up
disk 252:3 | 0-1-1 | 9XG4LY7JST91000640NS CC03 | Online, Spun Up
disk 252:4 | 0-1-0 | 9XG51233ST91000640NS CC03 | Online, Spun Up
End of Output **************************

Let me know if i need to change or configure anything else to make the I/O a bit faster than what it currently does. I cannot go in for using SSD's due to budget constraints. Need to make the best use of the SATA disks that i have currently.

Thanks
Jatin

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