This time I decided to do a blog post about the HPE Smart Array RAID controllers with their wonderful ssacli tool. The tooling of HPE is very powerful because you can online manage a VMware ESXi host and migrate for example from a RAID 1 volume to a RAID 10 without downtime or change the read and write cache ratio.
So far as I know I haven’t seen an identical tool yet from the other server hardware vendors like Cisco, Dell EMC, IBM, and Supermicro. The main difference has always been that the HPE tool can perform the operation live without downtime.
So far as I can remember it has been there for ages. It was already available for VMware ESX 4.0 and is still available in VMware ESXi 6.7. So thumbs-up for HPE :).
Let’s talk about controller support. The tool supports the most HPE SmartArray controllers over the last 10 to 15 years, for example, the Smart Array P400 was released in 2005 and is still working fine today.
Here is an overview of supported controllers:
- HPE Smart Array P2XX
- HPE Smart Array P4XX
- HPE Smart Array P7XX
- HPE Smart Array P8XX
HPE SSACLI – Location
In case you are using the HPE VMware ESXi custom images. The tool is already pre-installed when installing ESXi. The tool is installed as a VIB (vSphere Installable Bundle). This means it can also be updated with vSphere Update Manager.
Over the years the name of the HPE Storage Controller Tool has been changed and so has the location. Here is a list of locations that have been used for the last ten years for VMware ESXi:
# Location VMware ESXi 4.0/4.1/5.0 /opt/hp/hpacucli/bin/hpacucli # Location VMware ESXi 5.1/5.5/6.0 /opt/hp/hpssacli/bin/hpssacli # Location VMware ESXi 6.5/6.7 /opt/smartstorageadmin/ssacli/bin/ssacli
HPE SSACLI – Examples
I have collected some screenshots over the years. Screenshots were taken by doing maintenance on VMware ESXi servers. The give you an idea what valuable information can be shown.
HPE SSACLI – Abréviation
All commands have a short name to reduce the length of the total input provided to the ssacli tool:
### Shortnames: - chassisname = ch - controller = ctrl - logicaldrive = ld - physicaldrive = pd - drivewritecache = dwc - licensekey = lk ### Specify drives: - A range of drives (one to three): 1E:1:1-1E:1:3 - Drives that are unassigned: allunassigned
HPE SSACLI – Status
To view the status of the controller, disks or volumes you can run all sorts of commands to get information about what is going on in your VMware ESXi server. The extensive detail is very useful for troubleshooting and gathering information about the system.
# Show - Controller Slot 1 Basic configuration ./ssacli ctrl slot=1 show config # Show - Controller Slot 1 Detailed configuration ./ssacli ctrl slot=1 show config detail # Show - Controller Slot 1 Status ./ssacli ctrl slot=1 show status # Show - All Controllers Configuration ./ssacli ctrl all show config # Show - Controller slot 1 logical drive 1 status ./ssacli ctrl slot=1 ld 1 show status # Show - Basic Physical Disks status ./ssacli ctrl slot=1 pd all show status # Show - Detailed Physical Disk status ./ssacli ctrl slot=1 pd all show status
HPE SSACLI – Creating
Creating a new logical drive can be done online with the HPE Smart Array controllers. I have displayed some basic examples.
# Create - New single disk volume ./ssacli ctrl slot=1 create type=ld drives=2I:0:8 raid=0 forced # Create - New spare disk (two defined) ./ssacli ctrl slot=1 array all add spares=2I:1:6,2I:1:7 # Create - New RAID 1 volume ./ssacli ctrl slot=1 create type=ld drives=1I:0:1,1I:0:2 raid=1 forced # Create - New RAID 5 volume ./ssacli ctrl slot=1 create type=ld drives=1I:0:1,1I:0:2,1I:0:3 raid=5 forced
HPE SSACLI – Adding drives to logical drive
Adding drives to an already created logical drive is possible with the following commands. You need to perform two actions: adding the drive(s) and expanding the logical drive. Keep in mind: make a backup before performing the procedure.
# Add - All unassigned drives to logical drive 1 ./ssacli ctrl slot=1 ld 1 add drives=allunassigned # Modify - Extend logical drive 2 size to maximum (must be run with the "forced" flag) ./ssacli ctrl slot=1 ld 2 modify size=max forced
HPE SSACLI – Rescan controller
To issue a controller rescan, you can run the following command. This can be interesting for when you add new drives in
### Rescan all controllers ./ssacli rescan
HPE SSACLI – Drive Led Status
The LED status of the drives can also be controlled by the ssacli utility. An example is displayed below how to enable and disable a LED.
# Led - Activate LEDs on logical drive 2 disks ./ssacli ctrl slot=1 ld 2 modify led=on # Led - Deactivate LEDs on logical drive 2 disks ./ssacli ctrl slot=1 ld 2 modify led=off # Led - Activate LED on physical drive ctrl slot=0 pd 1I:0:1 modify led=on # Led - Deactivate LED on physical drive ctrl slot=0 pd 1I:0:1 modify led=off
HPE SSACLI – Modify Cache Ratio
Modify the cache ratio on a running system can be interesting for troubleshooting and performance beanchmarking.
# Show - Cache Ratio Status ./ssacli ctrl slot=1 modify cacheratio=? # Modify - Cache Ratio read: 50% / write: 50% ./ssacli ctrl slot=1 modify cacheratio=50/50 # Modify - Cache Ratio read: 0% / Write: 100% ./ssacli ctrl slot=1 modify cacheratio=0/100
HPE SSACLI – Modify Write Cache
Changing the write cache settings on the storage controller can be done with the following commands:
# Show - Write Cache Status ./ssacli ctrl slot=1 modify dwc=? # Modify - Enable Write Cache on controller ./ssacli ctrl slot=1 modify dwc=enable forced # Modify - Disable Write Cache on controller ./ssacli ctrl slot=1 modify dwc=disable forced # Show - Write Cache Logicaldrive Status ./ssacli ctrl slot=1 logicaldrive 1 modify aa=? # Modify - Enable Write Cache on Logicaldrive 1 ./ssacli ctrl slot=1 logicaldrive 1 modify aa=enable # Modify - Disable Write Cache on Logicaldrive 1 ./ssacli ctrl slot=1 logicaldrive 1 modify aa=disable
HPE SSACLI – Modify Rebuild Priority
Viewing or changing the rebuild priority can be done on the fly. Even when the rebuild is already active. Used it myself a couple of times to lower the impact on production.
# Show - Rebuild Priority Status ./ssacli ctrl slot=1 modify rp=? # Modify - Set rebuildpriority to Low ./ssacli ctrl slot=1 modify rebuildpriority=low # Modify - Set rebuildpriority to Medium ./ssacli ctrl slot=1 modify rebuildpriority=medium # Modify - Set rebuildpriority to High ./ssacli ctrl slot=1 modify rebuildpriority=high
HPE SSACLI – Modify SSD Smart Path
You can modify the HPE SDD Smart Path feature by disabling or enabling. To make clear what the HPE SDD Smart Path includes, here is
“HP SmartCache feature is a controller-based read and write caching solution that caches the most frequently accessed data (“hot” data) onto lower latency SSDs to dynamically accelerate application workloads. This can be implemented on direct-attached storage and SAN storage.”
For example, when running VMware vSAN SSD Smart Path must be disabled for better performance. In some cases worse the entire vSAN disk group fails.
# Modify - Enable SSD Smart Path ./ssacli ctrl slot=1 array a modify ssdsmartpath=enable # Modify - Disable SSD Smart Path ./ssacli ctrl slot=1 array a modify ssdsmartpath=disable
HPE SSACLI – Delete Logical Drive
Deleting a logical drive on the HPE Smart Array controller can be done with the following commands.
# Delete - Logical Drive 1 ./ssacli ctrl slot=1 ld 1 delete # Delete - Logical Drive 2 ./ssacli ctrl slot=1 ld 2 delete
HPE SSACLI – Erasing Physical Drives
In some cases, you need to erase a physical drive. This can be performed with multiple erasing options. Also, you can stop the process.
Erase patterns available:
# Erase physical drive with default erasepattern ./ssacli ctrl slot=1 pd 2I:1:1 modify erase # Erase physical drive with zero erasepattern ./ssacli ctrl slot=1 pd 2I:1:1 modify erase erasepattern=zero # Erase physical drive with random zero erasepattern ./ssacli ctrl slot=1 pd 1E:1:1-1E:1:3 modify erase erasepattern=random_zero # Erase physical drive with random random zero erasepattern ./ssacli ctrl slot=1 pd 1E:1:1-1E:1:3 modify erase erasepattern=random_random_zero # Stop the erasing process on phsyical drive 1E:1:1 ./ssacli ctrl slot=1 pd 1E:1:1 modify stoperase
HPE SSACLI – License key
In some cases a licence key needs to be installed on the SmartArray storage controller to enable the advanced features. This can be done with the following command:
# License key installation ./ssacli ctrl slot=1 licensekey XXXXX-XXXXX-XXXXX-XXXXX-XXXXX # License key removal ./ssacli ctrl slot=5 lk XXXXXXXXXXXXXXXXXXXXXXXXX delete
A couple of interesting links related to the HPE Storage Controller tool for VMware ESXi: