This post is more than 5 years old
5 Posts
1
4940
How to check if drive is HDD or SSD
I have Isilon8 simulator installed and have HDD on my virtual machine. I tried to emulate SSD on this machine by editing vm config as :
scsi0:8.virtualSSD = 1
the config was made OK, i reboot the VM and my settings are preserved,
Now, i want to check is SSD is in fact emulated or not.
usually for any linux machine, i would do :
cat /sys/block/sda/queue/rotational
and based on the value it outputs, i could say if its HDD or SSD but i cannot use the same thing in OneFS.
Any help is appreciated.
Thanks,
Yan_Faubert
117 Posts
0
April 29th, 2016 09:00
Try isi_drivenum -A. Last column should have HDD or SSD. Example from a 7.1.1.4 Virtual Isilon:
Bay 1 Bank 0 (Front) Port 0 Exp 0 PHY 0 Unit 0 Lnum 0 Active Guid 03f296ca559cb22254b43334000dd2b9 WWN 0 Locn 0,0,0 VMware Virtual disk FW:1.0 SN: exp 2000000 real 8203125 efs 5998592 /dev/da1 Tech SAS HDD
crklosterman
450 Posts
0
April 29th, 2016 10:00
By default in newer versions of OneFS SSD is used as L3 cache by default, so the output of isi stat -q will show 0GB of SSD. Change it in the UI to Metadata Read for this node pool, and i'll flush the content of L3 cache on SSD, and swap it to Metadata R/O which will take a while. Again just a guess i've never tried simulating this in a virtual cluster before.
~Chris Klosterman
chris.klosterman@emc.com
twitter: @croaking
suzyTheGreat
5 Posts
0
April 29th, 2016 10:00
Thanks for the response.
I tried the command and got output like this :
B8-1# isi_drivenum -A
isi_drivenum: Reading GUID from /dev/da8s1e: No such file or directory
Bay 1 Bank 0 (Front) Port 0x200 Exp 0 PHY 0 Unit 512 Lnum N/A N/A Guid N/A WWN 0000000000000000 Physical Block Size: 512 Logical Block Size: 512 Locn 0,0,0 VMware Virtual disk FW:1.0 SN: exp 0 real 1048576 efs 0 IFSpart N/A /dev/da1 Tech SAS SSD
Bay 2 Bank 0 (Front) Port 0x201 Exp 0 PHY 1 Unit 513 Lnum 5 Active Guid 7b499ed06ad153ff57232aeb000eaf70 WWN 0000000000000000 Physical Block Size: 512 Logical Block Size: 512 Locn 1,0,0 VMware Virtual disk FW:1.0 SN: exp 8388608 real 8589934 efs 6385664 IFSpart 2203648 /dev/da2 Tech SAS HDD
so, i have my Bay1 that shows SSD in the end which is great.
Now, i will have to move on to my next struggle
How can i make my cluster use SSD as well. At the moment , i see in my oneFS web UI, Storage usage , only HDD% and HDD usage and SSD is 0.
same thing as i can see form my Isilon cli as well like this :
B8-1# isi storagepool list
Name Nodes Requested Protection HDD Total % SSD Total %
----------------------------------------------------------------------------------
v200_24gb_2gb 1-3 +2d:1n 337.82M 30.432G 1.08% 0 0 0.00%
----------------------------------------------------------------------------------
Total: 1 337.82M 30.432G 1.08% 0 0 0.00%
How can i make the cluster to use SSD disk ?
Peter_Sero
1.2K Posts
0
May 6th, 2016 03:00
Using L3 cache on virtual Isilon nodes is... even more "unsupported" than running the nodes as provided in the vmdks.
But it can be done -- interested (anyone), or have you figured it out already?
-- Peter