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Scrubbing a SAN
I have a gigenetcloud VPS and it has been sloooow lately. So I submitted a ticket and the first ticket they said they are looking into it. Then about 10 hours later they said they they are Scrubbing the SANS. Correct me if im wrong but isnt scrubbing a HDD when you remove all the files on it? But my SAN knowledge is very minimal so would you scrub a SAN to increase performance or something?
Comments
Maybe they are giving the San some TLC in the bath?
No longer with ND
Bow chica bow wow.
Scrubbing means rereading, checking checksums and then sometimes writing again all of the data on the disk to ensure cold data is not corrupted.
With ZFS filesystems, this is common -
http://en.wikipedia.org/wiki/ZFS#Resilvering_and_scrub
hahahah i needed to laugh, thanks
"scrub checks everything, including metadata and the data. The effect can be observed by comparing fsck to scrub times, sometimes a fsck on a large raid completes in a few minutes, which means only the metadata was checked. To traverse all metadata and data on a large raid, takes many hours, which is exactly what scrub does."
That's why it takes so long @Spencer.
http://www.maxshosting.com/
Unofficial community troll. AMA!
Using a single SAN is just trouble, all these horror stories, It makes more sense to just have small hypervisor's, which when one goes down it can fallover to another hypervisor.
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@Jacob and how do you failover data if there is no shared storage?
NFS.
AboveClouds • UK Company • UK Datacentre • UK Customer Support
High Performance Pure SSD Cloud Hosting with a personal touch ❤
So you are using NFS to a shared storage where all your vm's are?
So you are using a NAS instead of SAN?
No.
No.
Just stating that rather than having a single huge SAN, these providers should look into multiple smaller SAN's or using NFS between hypervisors.
AboveClouds • UK Company • UK Datacentre • UK Customer Support
High Performance Pure SSD Cloud Hosting with a personal touch ❤
I dont think that would be very cost effective.
Then it just makes all the cloud hype even more BS.
NFS is cost effective and if you are multi homed, redundant power + networking gear then it's all covered.
AboveClouds • UK Company • UK Datacentre • UK Customer Support
High Performance Pure SSD Cloud Hosting with a personal touch ❤
with NFS you still need storage somewhere. So you still run into the same problem. A single SAN or a single NFS box? I would rather go with the SAN.
Now a days decent SAN's have not only multiple PSU's but also multiple controllers which includes cpu, ram and networking.
Nfsmwilcbe trash as a San replacement
No longer with ND