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enable Cache on HW raid ?
| Posted by hichkas, 10-30-2016, 11:00 AM |
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hello
we have server
4*2TB on RAID 10 HW raid card HP P410 with 512 mb memory
i see cache is disable but i can enable caching but when i want enable it on raid card who a warning about data lost if power failure...
you know we care disk performance , so its can be help to performance enable cache on raid card?
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| Posted by HumaneHostingOwner, 10-30-2016, 11:31 AM |
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Ask your provider if you can add on a BBU to your hosting order. This way you don't need to worry about your data nor performance.
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| Posted by hichkas, 10-30-2016, 11:56 AM |
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i think BBU its not enabled...
its better to enable cache increase performance?
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| Posted by Linevast, 10-30-2016, 12:12 PM |
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the answer is very easy. Enable the write cache if dataloss doesnt result in a death sentence for your business. The performance boost is immense. But if not, go forward without it.
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| Posted by hichkas, 10-30-2016, 12:18 PM |
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if happen power failure 100% data on RAID 10 will be lost?
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| Posted by Linevast, 10-30-2016, 12:23 PM |
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a power outage would result in a 100% wipe of data hold on the cache memory from your controller. And that will damage your array. The extent of damage depends on the data stored in the cache at the time of outage.
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| Posted by hichkas, 10-30-2016, 12:26 PM |
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here our raid status
Controller Status: OK
Hardware Revision: C
Firmware Version: 6.60
Rebuild Priority: Medium
Expand Priority: Medium
Surface Scan Delay: 15 secs
Surface Scan Mode: Idle
Queue Depth: Automatic
Monitor and Performance Delay: 60 min
Elevator Sort: Enabled
Degraded Performance Optimization: Disabled
Inconsistency Repair Policy: Disabled
Wait for Cache Room: Disabled
Surface Analysis Inconsistency Notification: Disabled
Post Prompt Timeout: 0 secs
Cache Board Present: True
Cache Status: OK
Cache Ratio: 100% Read / 0% Write
Drive Write Cache: Disabled
Total Cache Size: 512 MB
Total Cache Memory Available: 400 MB
No-Battery Write Cache: Disabled
Battery/Capacitor Count: 0
SATA NCQ Supported: True
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| Posted by Linevast, 10-30-2016, 12:28 PM |
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yes, write cache is disabled - so all should be fine
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| Posted by HumaneHostingOwner, 10-30-2016, 12:31 PM |
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Check in with your provider for BBU add on upgrade quotation. Personally if you're on a HW RAID configuration it's well worth throwing that $10-$20/month at a BBU .
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| Posted by hichkas, 10-30-2016, 12:36 PM |
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i think we should add BBU enable caching... for more performance
HI
thank you for guide us here
i have own my server
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| Posted by HumaneHostingOwner, 10-30-2016, 12:40 PM |
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No problems that what WHT is here for.
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| Posted by Linevast, 10-30-2016, 12:54 PM |
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if you're able to do that our to receive one from your provider - it's the best solution!
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| Posted by melinda911, 10-30-2016, 07:29 PM |
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in my opinion is better to have cache enabled as it will boost performance, but this can corrrupt data in a power failure, so your raid must have a batery for it and his disks
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| Posted by hichkas, 10-31-2016, 09:34 AM |
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Hello
i have see a option:
No-Battery Write Cache:
when i want enable it there is no warning about data lost
enable this option its safe ?
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| Posted by Linevast, 10-31-2016, 10:08 AM |
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the option only declares that the write cache will be automatically disabled when no battery is detected.
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| Posted by hichkas, 10-31-2016, 10:11 AM |
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i have set :
Drive Write Cache: Disabled
No-Battery Write Cache: Enabled
its fine? or still is risk
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| Posted by Linevast, 10-31-2016, 10:12 AM |
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no, there is no risk.
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| Posted by ERKALE-NET, 11-05-2016, 09:40 AM |
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After i disabled our raid cache, write speed on 6 (raid 10) harddrive was 20 MB/s. This is rediciulos, so after i enabled the cache, it was normal, we use a battery backup for it and i think you should enable it as well.
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| Posted by WootHosting - Jason, 11-06-2016, 02:06 AM |
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Yes, the purpose of a BBU is so you can enable write caching. IMHO, it is worth the extra cost to add a BBU to your server, for the added performance you will receive by enabling the caching.
You CAN enable write caching without a BBU present, however, you could potentially lose all data on your server in the event of an unexpected shut down, such as if the power was pulled unexpectedly.
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