1. Storage Processor (SP) Cache Size:
Read Cache - 10% of the available Cache. (Recommended Min 200MB & Max 1024 MB).
Note: read cache facilitates pre-fetching, so it doesn't need to be large. Increases read cache above recommended values only if if you know that you have multiple application with sequential read-intensive.
Write Cache - set remaining memory to write cache.
2. Cache Page Size: min amount of SP memory used to serve a single I/O request.
Default: 8 KB provide a good balance for both Block ad File Storage.
Increase Max 16 KB; in case your environment has large-lock I/O size.
Other sizes 2 KB and 4 KB is good for like database environments.
3. Cache watermark: controls the flushing behavior of write cache.
Recommended - Low 60% High 80% (maintain diff b/w low ad high of about 20%)
4. Physical drive placement: place highest performing drives in lowest numbered enclosures on each bus.
5.Hot Spares: allocate 1 hot spare or every 30 drives.
6. Drive Type:
FLASH: extreme performance / transactional random workloads.
SAS: General Permormance
NL-SAS: Archive Purpose / aging data.
7. IOPS: Calculated based on drive types
8. RAID Level:
RAID 1/0 - Heavy Transnational with >25% random writes
RAID 5 - Medium-High performance, sequential
RAID 6 - archiving, read-biased workloads
9. Maximum Drives in a Pool:
10. FAST Cache: Recommended to have size of Active Data set.
EMC has tools to determine the active data set, or else in general 5% of the capacity would be good
Read Cache - 10% of the available Cache. (Recommended Min 200MB & Max 1024 MB).
Note: read cache facilitates pre-fetching, so it doesn't need to be large. Increases read cache above recommended values only if if you know that you have multiple application with sequential read-intensive.
Write Cache - set remaining memory to write cache.
2. Cache Page Size: min amount of SP memory used to serve a single I/O request.
Default: 8 KB provide a good balance for both Block ad File Storage.
Increase Max 16 KB; in case your environment has large-lock I/O size.
Other sizes 2 KB and 4 KB is good for like database environments.
3. Cache watermark: controls the flushing behavior of write cache.
Recommended - Low 60% High 80% (maintain diff b/w low ad high of about 20%)
4. Physical drive placement: place highest performing drives in lowest numbered enclosures on each bus.
5.Hot Spares: allocate 1 hot spare or every 30 drives.
6. Drive Type:
FLASH: extreme performance / transactional random workloads.
SAS: General Permormance
NL-SAS: Archive Purpose / aging data.
7. IOPS: Calculated based on drive types
8. RAID Level:
RAID 1/0 - Heavy Transnational with >25% random writes
RAID 5 - Medium-High performance, sequential
RAID 6 - archiving, read-biased workloads
9. Maximum Drives in a Pool:
10. FAST Cache: Recommended to have size of Active Data set.
EMC has tools to determine the active data set, or else in general 5% of the capacity would be good
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