Hitachi Compute Blade 2000, User Manual

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367
5
Server B
lad
e S
etup
9 Click Next .
The following screen appears:
10 With all the RAID disk array configurations selected, specify RAID level, stripe
size, read policy, write policy, and disk array size.
Set each item to the following value.
Item Content Setting value **
RAID Level RAID Level [RAID 10]
Stripe Size Stripe size 8 KB / 16 KB / 32 KB / [64 KB] / 128 KB / 256 KB /
512 KB / 1 MB
Access Policy Access policy [RW (reading and writing)] /
Read Only (reading only) /
Blocked (access denied)
Read Policy Read policy [Normal (no advanced reading)] /
Ahead (always advanced reading)
Write Policy *1 *2 Write policy Without cache backup module installed * 4: [Write
Through (write cache invalid)] /
Always Write Back (write-cache valid) / Write Back
with BBU (Write cache is valid only when the battery
is installed.)
With cache backup module installed * 5: Write
Through (write-cache invalid)/ Always Write Back
(write-cache valid) /[Write Back With BBU (Write cache
is valid only when a cache backup module is
installed.)]
IO Policy Read-cache operation [Direct (reading from the cache at a cache hit)] /
Cached (always reading from the cache)
NOTICE
When enabling the write cache of the disk array with the equipment that has no
cache backup module installed, connect the system equipment to UPS. When
you use the equipment without connecting to the UPS, data can disappear and
be corrupted.