What Are You Doing Right Now
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Has anyone tried to create an SSD cache in a raid 0 (2 drives) to support a raid 10? Is this possible?
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@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
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For some reason there are only now 2 DosEquis left in the fridge.
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@JaredBusch said in What Are You Doing Right Now:
yup it be dead drive.. solid red light on status after power cycle.
Didn't you have the same thing happen last year?
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@stacksofplates said in What Are You Doing Right Now:
@JaredBusch said in What Are You Doing Right Now:
yup it be dead drive.. solid red light on status after power cycle.
Didn't you have the same thing happen last year?
Yes and this is the replacement drive. Never noticed it was apparently old stock
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@JaredBusch said in What Are You Doing Right Now:
@stacksofplates said in What Are You Doing Right Now:
@JaredBusch said in What Are You Doing Right Now:
yup it be dead drive.. solid red light on status after power cycle.
Didn't you have the same thing happen last year?
Yes and this is the replacement drive. Never noticed it was apparently old stock
Had something similar with a Netgear SOHO NAS. Drives in a specific slot kept failing. Never solved this, the device is no longer used.
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@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4x 4TB hard drives in a raid 10. Would you be able to use SSD caching to support that raid 10?
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@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
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@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
Yeah but only active data. Not entire drives.
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@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
Yeah but only active data. Not entire drives.
Be not too sure about this. What if a file gets partly overwritten, but the remaining part is still in the cache? Or a half-committed transaction in a database?
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@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
Yeah but only active data. Not entire drives.
Be not too sure about this. What if a file gets partly overwritten, but the remaining part is still in the cache? Or a half-committed transaction in a database?
I'm considering this for media. So if I lose 25% it's still not a problem provided the raid is still functioning as intended. I just replace the media. No big deal.
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@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
Yeah but only active data. Not entire drives.
Be not too sure about this. What if a file gets partly overwritten, but the remaining part is still in the cache? Or a half-committed transaction in a database?
I'm considering this for media. So if I lose 25% it's still not a problem provided the raid is still functioning as intended.
What type of media? A cache won't give you much in case of large videos
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@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 said in What Are You Doing Right Now:
@thwr said in What Are You Doing Right Now:
@wirestyle22 You mean that the cache itself is striped across drives? Can be very dangerous, depending on the type of cache (read/write).
Let me fully explain how I'm viewing this so if I'm wrong about something you guys can correct me. The way I view SSD caching is similar to the way I view memory. It's like faster, more expensive temporary space. So You have 4 4TB hard drives in a raid 10. Can you use SSD caching to support that raid 10?
Sure, with a RAID implementation that can handle this, like ZFS (just for example). But be double sure about what you plan to do. When your write cache goes south due to a drive failure or a power outage, data will be lost.
Yeah but only active data. Not entire drives.
Be not too sure about this. What if a file gets partly overwritten, but the remaining part is still in the cache? Or a half-committed transaction in a database?
I'm considering this for media. So if I lose 25% it's still not a problem provided the raid is still functioning as intended. I just replace the media. No big deal.
Here's a quick overview, ZFS related: https://forums.freenas.org/index.php?threads/ssds-arc-and-zil.17191/
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@thwr cool. thanks
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@DustinB3403 said in What Are You Doing Right Now:
@dafyre said in What Are You Doing Right Now:
@JaredBusch : And nobody asked you the important question: Do you have a spare?
These can be picked up at best buy for $100, no real need to hold a spare....
True but when I want a spare I want one **right F!(#%@# now and $100 is no big deal to have it on hand.
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xferring my ueb backup vdis to new ubuntu storage server. 60-70MB/sec from iostat, hitting nearly 1750 iops(not all the time tho) according to XenCenter. Still going to take all afternoon and most of the night.
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Hanging with @scottalanmiller @JentuTechnologies @Minion-Queen -
Tried 1911 Raspberry on draft today. It was good.
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Working my way through Zed Shaw's "Learn C the Hard Way".
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@FrostyPhoenix said in What Are You Doing Right Now:
Hanging with @scottalanmiller @JentuTechnologies @Minion-QueenWe had lots of fun with you guys today! Thanks for making the 5+ hour drive to visit us, oh and for my MINION Tic Tac's!!
