Fujitsu PRIMEQUEST 2000 Series Design Manual page 89

3.3.4 HDD Configuration (2/5)
Notes (2/2)
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• When internal HDDs are used, the hardware RAID controller may fail to fully detect failures on a hard disk,
and a system slowdown may occur (excluding RHEL 6.4 or later).
[Additional Notes]
If intermittent media errors occur on a HDD, a slowdown may occur on rare occasions.
This problem may occur for example due to many scratches in a wide area on the HDD. The RAID
controller tries to replace the media error area and salvage data using RAID parity. Therefore, if
intermittent media errors occur over a long time, the salvage processing takes a longer time and the
conventional media access processing is delayed.
If there are restrictions in operation, the following options are recommended.
- Use ETERNUS.
- Replace the HDD with a SAS-SSD.
• When using an internal SSD for a PCI slot, note the following points.
• The SSD cannot be used as a boot drive.
• When a failed SSD is replaced, the integrity of the data in the drive cannot be guaranteed. Reliability
design including recovery from a regular backup and software RAID configuration is required to prepare
for possible risks.
• When using an internal HDD in an SB, note the following points.
When the Reserved SB function is used, the HDD that is used as a boot drive and the data disks cannot
be started or operated.
PRIMEQUEST 2000 Series Design Guide 88 Copyright 2014 FUJITSU LIMITED