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SUPPORT COMMUNICATION- CUSTOMER ADVISORY

Document ID: c05843703

Version: 1

Advisory: HP Z4, Z6, Z8 G4 Workstation - Time to Hibernate Is Slow With Windows OS on RAID 5 Using HDDs

Notice:: The information in this document, including products and software versions, is current as of the release date.The document is subject to change without notice.

Release date : 22-Nov-2017

Last updated : 22-Nov-2017

DESCRIPTION
Hibernation or suspend to disk is the process of saving the contents of RAM to the disk. Compressing the memory and writing the data to disk can be a time consuming inefficient process. In modern workstations it is not uncommon to have hibernation files that are 80GB. Writing the hibernation file to HDDs that have a write performance range between 150MB/s to 225MB/s under ideal conditions can take several minutes.
Actual performance during a hibernation will be lower because the data being written to the drives is sent with a range of transfer sizes and may be sent single threaded.
Windows also has to stop processes to prevent them from modifying the memory during the hibernation process. This overhead may add a few minutes to the hibernation process. There may be noticeable moments of no disk activity at all.
Using optimized drive performance numbers without considering inefficiencies of having to stop processes in order to save their state and compress the memory results in 6 to 9 minutes to save 80GB to HDDs.

80000MB / 225MB/s / (60seconds/minute) = 6 minutes
80000MB / 150MB/s / (60seconds/minute) = 8.9 minutes
In the case of RAID 5 there is additional overhead for parity calculation that has to be performed by the CPU using a portion of reserved memory. Parity needs to be read, verified, recalculated, and written with every data write.
A simplified formula for write performance on RAID 5 is:
HDD_MB/s x #disks x 25%
On a 3 HDD RAID 5 with 225MB/s HDDs write performance is expected to be:
225MB/s x 3 x .25 = 168MB/s
To save the 80GB hibernate file it would take:
80000MB / 168MB/s / (60seconds/minute) = 7.9 minutes
On a 3 HDD RAID 5 with 150MB/s HDDs write performance is expected to be:
150MB/s x 3 x .25 = 113MB/s
To save the 80GB hibernate file we it would take:
80000MB / 113MB/s / (60seconds/minute) = 11.8 minutes
Actual hibernation time will be longer with general Windows overhead adding a few minutes to the process.
Windows 10 has some improvements in the hibernate process but is still noticeably slow.
Systems with more DRAM will have longer hibernate times.
Different HDD models may result in approximately a 2 minute variation in hibernate time.
Mixing drive models in RAID 5 can reduce performance to the performance of the lowest performing drive in the RAID 5.

SCOPE
Systems:
  • HP Z4 G4 Workstation
  • HP Z4 G4 Workstation
  • HP Z6 G4 Workstation
  • HP Z6 G4 Workstation
  • HP Z8 G4 Workstation
  • HP Z8 G4 Workstation
Operating Systems:
  • Microsoft Windows 7 Ultimate (64-bit)
  • Microsoft Windows 7 Professional (64-bit)
  • Microsoft Windows 7 Home Premium (64-bit)
  • Microsoft Windows 7 Home Basic (64-bit)
  • Microsoft Windows 7 Enterprise (64-bit)
  • Microsoft Windows 7 (64-bit)
  • Microsoft Windows 10 TH1
  • Microsoft Windows 10 RS2
  • Microsoft Windows 10 RS1
  • Microsoft Windows 10 Pro (64-bit)
  • Microsoft Windows 10 Home (64-bit)
  • Microsoft Windows 10 Enterprise (64-bit)
RESOLUTION
HP does not recommend RAID 5 for OS installations where performance is important.
While there is no fix for this issue, performance can be improved by doing some of the following:
  • Turn off hibernate.
  • Turn off fast boot. (Fast boot is a hybrid combination of cold boot and wake from hibernate. This makes the system slow to power off and can be slower to power up than a standard cold boot.)
  • Enable Write Back Cache on the RAID 5. This can almost double performance of the RAID 5, but increases risk of data loss.
  • Move the page file from the OS HDD to a SSD.
  • Put the OS on a SSD and use the RAID 5 only for data.

Hardware platforms affected : HP Z4 G4 Workstation, HP Z4 G4 Workstation, HP Z6 G4 Workstation, HP Z6 G4 Workstation, HP Z8 G4 Workstation, HP Z8 G4 Workstation

Operating systems affected : Microsoft Windows 7 (64-bit) (deleted) Microsoft Windows 7 Enterprise (64-bit) (deleted) Microsoft Windows 7 Home Basic (64-bit) (deleted) Microsoft Windows 7 Home Premium (64-bit) (deleted) Microsoft Windows 7 Professional (64-bit) (deleted) Microsoft Windows 7 Ultimate (64-bit) (deleted)

Software affected : Not applicable

Support Communication Cross Reference ID : IA05843703

HP Inc. shall not be liable for technical or editorial errors or omissions contained herein.The information provided is provided "as is" without warranty of any kind.To the extent permitted by law, neither HP or its affiliates, subcontractors or suppliers will be liable for incidental, special or consequential damages including downtime cost; lost profits; damages relating to the procurement of substitute products or services; or damages for loss of data, or software restoration.The information in this document is subject to change without notice.HP Inc. and the names of HP products referenced herein are trademarks of HP Inc. in the United States and other countries.Other product and company names mentioned herein may be trademarks of their respective owners.

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