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2 SSD with HW raid 0 speed

vpsteavpstea Member
in General

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

  • MarkTurnerMarkTurner Member

    What is the RAID controller make/model and what are the SSD's make/model?

  • vpsteavpstea Member
    edited September 2015 
    # fdisk -l

Disk /dev/sda: 479.0 GB, 479023071232 bytes
255 heads, 63 sectors/track, 58237 cylinders, total 935591936 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000f2de5

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      391167      194560   83  Linux
/dev/sda2          393214   935589887   467598337    5  Extended
/dev/sda5          393216     2344959      975872   82  Linux swap / Solaris
/dev/sda6         2347008   935589887   466621440   83  Linux


# df -h
Filesystem                                              Size  Used Avail Use% Mounted on
rootfs                                                  439G  830M  415G   1% /
udev                                                     10M     0   10M   0% /dev
tmpfs                                                   3.2G  196K  3.2G   1% /run
/dev/disk/by-uuid/29de65ab-1ba5-4e7b-96ab-ea5a98b8f369  439G  830M  415G   1% /
tmpfs                                                   5.0M     0  5.0M   0% /run/lock
tmpfs                                                   6.5G     0  6.5G   0% /run/shm
/dev/sda1                                               184M   23M  153M  13% /boot
  • vpsteavpstea Member
    edited September 2015

    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

  • vpsteavpstea Member
    edited September 2015 
    lspci -vv | grep -i raid
02:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS 2208 [Thunderbolt] (rev 05)
    Kernel driver in use: megaraid_sas
  • SSDBlazeSSDBlaze Member, Host Rep

    @MarkTurner said:
    What is the RAID controller make/model and what are the SSD's make/model?

    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?

  • perennateperennate Member, Host Rep

    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).

    Thanked by 1jar
  • vpsteavpstea Member

    what is the model?

    # smartctl --all /dev/sda1
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-4-amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

Vendor:               LSI     
Product:              MR9271-4i       
Revision:             3.19
User Capacity:        479,023,071,232 bytes [479 GB]
Logical block size:   512 bytes
Logical Unit id:      0x600605b005d002301d95d9d609a59694
Serial number:        009496a509d6d9951d3002d005b00506
Device type:          disk
Local Time is:        Thu Sep 24 01:30:40 2015 EDT
Device does not support SMART

Error Counter logging not supported
Device does not support Self Test logging
  • IkoulaIkoula Member

    What is the server cpu ? Maybe I/O are limited by cpu.

  • MarkTurnerMarkTurner Member
    edited September 2015

    vpstea said: what is the model?

    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:

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    
16384+0 records in
    
16384+0 records out
    
1073741824 bytes (1.1 GB) copied, 2.40805 s, 446 MB/s

    You are getting that throughput from 2 disks

  • quadhostquadhost Member
    edited September 2015

    What disks are they is the real question as to if they are performing well.

  • BharatBBharatB Patron Provider, Veteran

    lsblk -io KNAME,TYPE,SIZE,MODEL , use that command to know disk model

  • MarkTurnerMarkTurner Member

    BharatB said: 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.

  • BharatBBharatB Patron Provider, Veteran

    @MarkTurner said:

    What about , lshw -class disk

  • MarkTurnerMarkTurner Member

    BharatB said: What about , lshw -class disk

    You need to interrogate the RAID controller with the command I put above.

  • DalCompDalComp Member

    @MarkTurner said:
    To give you a comparison, on a single lowly Samsung 850 Evo:

    250GB ?

  • MarkTurnerMarkTurner Member

    DalComp said: 250GB ?

    Yes

  • vpsteavpstea Member

    i just got the server 1 day, raid card bad...
    they are resolving it.

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