(please don't top post) On 21 February 2011 18:25, Roberto Spadim <roberto@xxxxxxxxxxxxx> wrote: > TRIM is a new feature for many hard disk/ssd > itÂs more to get a bigger life o disk, allow a dynamic badblock > reallocation (filesystem must tell where is empty) > > > 2011/2/21 Phillip Susi <psusi@xxxxxxxxxx>: >> On 2/9/2011 10:49 AM, David Brown wrote: >>> I've been reading a little more about this. ÂIt seems that the days of >>> TRIM may well be numbered - the latest generation of high-end SSDs have >>> more powerful garbage collection algorithms, together with more spare >>> blocks, making TRIM pretty much redundant. ÂThis is, of course, the most >>> convenient solution for everyone (as long as it doesn't cost too much!). >>> >>> The point of the TRIM command is to tell the SSD that a particular block >>> is no longer being used, so that the SSD can erase it in the background >>> - that way when you want to write more data, there are more free blocks >>> ready and waiting. ÂBut if you've got plenty of spare blocks, it's easy >>> to have them erased in advance and you don't need TRIM. >> >> It is not just about having free blocks ready and waiting. ÂWhen doing >> wear leveling, you might find an erase block that has not been written >> to in a long time, so you want to move that data to a more worn block, >> and use the less worn block for more frequently written to sectors. ÂIf >> you know that sectors are unused because they have been TRIMed, then you >> don't have to waste time and wear copying the junk there to the new >> flash block. >> >> TRIM is also quite useful for thin provisioned storage, which seems to >> be getting popular. >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-raid" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at Âhttp://vger.kernel.org/majordomo-info.html >> > > > > -- > Roberto Spadim > Spadim Technology / SPAEmpresarial > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at Âhttp://vger.kernel.org/majordomo-info.html > TRIM is not a new feature for HDDs as they don't have the problem that SSDs have. Where did you hear this? // Mathias -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
