Re: raid 0 and ssd

2011-04-14 Thread Terje Marthinussen
Hm... You should notice that unless you have TRIM, which I don't think any OS support with any raid functionality yet, then once you have written once to the whole SSD, it is always full! That is, when you delete a file, you don't "clear" the blocks on the SSD so as far as the SSD goes, the data

Re: raid 0 and ssd

2011-04-13 Thread Drew Kutcharian
RAID 0 is the fastest, but you'll lose the whole array if you lose a drive. One thing to keep in mind is that SSDs get slower as they get filled up and closer to their capacity due to garbage collection. If you want more info on how SSDs perform in general, Percona guys have done extensive test

raid 0 and ssd

2011-04-13 Thread Anurag Gujral
Hi All, We are using three ssd disks with cassandra 0.7.3 , should we set them as raid0 .What are the advantages and disadvantages of doing this. Please advise. Thanks Anurag