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BL460C G1 disk i/o error

kistainc
Occasional Visitor

BL460C G1 disk i/o error

Hello,
we are facing very strange issue with blades. We installed single SSD in it. And when we run disk i/o

dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

we get 8MB/s


Can anyone please tell us what is going wrong?

2 REPLIES
sydras
Occasional Visitor

Re: BL460C G1 disk i/o error

Did you get a solution to your issue? I am facing a similar situation wherein I get a similar output on two G7 blade servers with two HDDs

 

Server A:

 

fdisk -l /dev/sda |grep GB

Disk /dev/sda: 600.1 GB, 600093712384 bytes

 

dd if=/dev/zero of=/tmp/testfile bs=1M count=1000 oflag=direct

1000+0 records in

1000+0 records out

1048576000 bytes (1.0 GB) copied, 20.5775 s, 51.0 MB/s

 

 

Server B:

 

fdisk -l /dev/sda |grep GB

Disk /dev/sda: 600.1 GB, 600093712384 bytes

 

dd if=/dev/zero of=/tmp/testfile bs=1M count=1000 oflag=direct

1000+0 records in

1000+0 records out

1048576000 bytes (1.0 GB) copied, 4.06195 s, 258 MB/s

 

I am unable to explain this difference in I/O performance.

 

 

Jan Soska
Honored Contributor

Re: BL460C G1 disk i/o error

Hello,

please have on mind G1 servers smartarrays could by not strong enough to handle modern SSDs and your setup is oficially not supported.

2 second post: the same firmware level on both server?

 

Jan