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2 SSD with HW raid 0 speed
it seems not good?
what's yours?
this results is 2*250g SSD with HW raid 0
dd if=/dev/zero of=test bs=64k count=512 oflag=dsync 2>&1 && rm -f test
512+0 records in
512+0 records out
33554432 bytes (34 MB) copied, 0.535626 s, 62.6 MB/s
dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 2>&1 | tail -n 1 && rm -f test
268435456 bytes (268 MB) copied, 0.627032 s, 428 MB/s
Comments
What is the RAID controller make/model and what are the SSD's make/model?
dmesg |grep -i raid
[ 1.591183] megaraid_sas 0000:02:00.0: setting latency timer to 64 [ 1.591615] megaraid_sas 0000:02:00.0: irq 43 for MSI/MSI-X [ 1.591619] megaraid_sas 0000:02:00.0: irq 44 for MSI/MSI-X [ 1.591624] megaraid_sas 0000:02:00.0: irq 45 for MSI/MSI-X [ 1.591628] megaraid_sas 0000:02:00.0: irq 46 for MSI/MSI-X [ 1.591633] megaraid_sas 0000:02:00.0: irq 47 for MSI/MSI-X [ 1.591637] megaraid_sas 0000:02:00.0: irq 48 for MSI/MSI-X [ 1.591642] megaraid_sas 0000:02:00.0: irq 49 for MSI/MSI-X [ 1.591646] megaraid_sas 0000:02:00.0: irq 50 for MSI/MSI-X [ 1.711204] scsi0 : LSI SAS based MegaRAID driver
Any knowledge on what the OP posted above?
@vpstea
I'm assuming you don't know if the SSDs are Intels or Samsungs? Or what model?
The speed seems pretty reasonable. You should see much higher random I/O performance than HDD, but sequential performance won't be significantly better (depending on model).
what is the model?
What is the server cpu ? Maybe I/O are limited by cpu.
That shows the RAID controller, but not the make/model of SSDs.
9271 I think is a Megaraid, so you should be able to run:
megacli -PDList -a0
and get a list of the disks on the system. What are the disks and what is their link speed?
To give you a comparison, on a single lowly Samsung 850 Evo:
You are getting that throughput from 2 disks
What disks are they is the real question as to if they are performing well.
lsblk -io KNAME,TYPE,SIZE,MODEL , use that command to know disk model
This won't work with a RAID controller, the RAID controller will just report its model as the disk name.
What about , lshw -class disk
You need to interrogate the RAID controller with the command I put above.
250GB ?
Yes
i just got the server 1 day, raid card bad...
they are resolving it.