Volatile write cache detection
Last Updated: 2021-03-08
IBM Spectrum Scale Erasure Code Edition now has the ability to test if volatile write caching mode is enabled on the physical disks.
Many SCSI and NVMe drives support a volatile write caching mode in which a drive reports success back from write operations as soon as data has been received into the drive's internal cache memory. IBM Spectrum Scale Erasure Code Edition cannot be used with drives operating in this mode because on power failure, the cached data is lost, causing already committed data to revert to an older version. This can lead to corruption of both the RAID and file system metadata, resulting in data integrity issues. If IBM Spectrum Scale Erasure Code Edition detects a drive with volatile write caching mode enabled, it puts the pdisk into a new volatile write cache enabled (VWCE
Volatile write cache detection
Last Updated: 2021-03-08
IBM Spectrum Scale Erasure Code Edition now has the ability to test if volatile write caching mode is enabled on the physical disks.
Many SCSI and NVMe drives support a volatile write caching mode in which a drive reports success back from write operations as soon as data has been received into the drive's internal cache memory. IBM Spectrum Scale Erasure Code Edition cannot be used with drives operating in this mode because on power failure, the cached data is lost, causing already committed data to revert to an older version. This can lead to corruption of both the RAID and file system metadata, resulting in data integrity issues. If IBM Spectrum Scale Erasure Code Edition detects a drive with volatile write caching mode enabled, it puts the pdisk into a new volatile write cache enabled (VWCE