thank you Ulrich. 2016-10-11 14:42 GMT+08:00 Ulrich Windl <[email protected]>:
> I guess your problem is similar to caching a local spinning disk using a > local SSD, unrelated to iSCSI. I once readabout some solutions, but cannot > remember. Maybe googling on "linux cache device" or "block device cache" > could help you. > > Regards, > Ulrich > > >>> ??? <[email protected]> schrieb am 11.10.2016 um 04:36 in Nachricht > <campnguzu9bdmbtpuxtxaaqt7b8eo8uzot+23z5mewa6hwbh...@mail.gmail.com>: > > Hi Ulrich, > > you maybe misunderstood my purpose, i am not going to do caching on iSCSI > > transport layer. > > you are right that iSCSI devices can be cached just as normal block > > devices are. > > indeed a normal block device can be cached using memory to cache the hot > > data. > > but iscsi driver has differences with normal block device, after all > it's a > > remote disk. > > so i want to use a normal block device to act as a cache disk for iscsi > > device besides using the normal memory cache. > > do you have any suggestions? > > thank you! > > > > 2016-10-10 21:43 GMT+08:00 Ulrich Windl <[email protected] > regensburg.de>: > > > >> The iSCSI transport layer is definitely the wrong place to do caching! > >> iSCSI devices are cached just as normal block devices are (unless you > use > >> direct I/O). > >> > >> >>> ??? <[email protected]> schrieb am 10.10.2016 um 11:46 in > Nachricht > >> <[email protected]>: > >> > >> > > >> > does iSCSI protocol itself or open-source iSCSI implementations like > >> > open-iscsi have a cache scheme? > >> > > >> > since an iscsi initiator may access the same data many times, it does > not > >> > have to get the data from remote target every time via network. so i > am > >> > wondering if iSCSI provides a scheme by which clients can use a local > >> disk > >> > to cache the hot data so that when the accessed data is stored in the > >> local > >> > cache disk initiator can directly get the data from local disk, just > >> like a > >> > web browser cache does. does anyone konw about this? > >> > > >> > how can i implement this? thank you. > >> > > >> > > >> > -- > >> > You received this message because you are subscribed to the Google > Groups > >> > "open-iscsi" group. > >> > To unsubscribe from this group and stop receiving emails from it, > send an > >> > email to [email protected]. > >> > To post to this group, send email to [email protected]. > >> > Visit this group at https://groups.google.com/group/open-iscsi. > >> > For more options, visit https://groups.google.com/d/optout. > >> > >> > >> > >> > >> -- > >> You received this message because you are subscribed to a topic in the > >> Google Groups "open-iscsi" group. > >> To unsubscribe from this topic, visit https://groups.google.com/d/ > >> topic/open-iscsi/uVZSZV1pz1M/unsubscribe. > >> To unsubscribe from this group and all its topics, send an email to > >> [email protected]. > >> To post to this group, send email to [email protected]. > >> Visit this group at https://groups.google.com/group/open-iscsi. > >> For more options, visit https://groups.google.com/d/optout. > >> > > > > -- > > You received this message because you are subscribed to the Google Groups > > "open-iscsi" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to [email protected]. > > To post to this group, send email to [email protected]. > > Visit this group at https://groups.google.com/group/open-iscsi. > > For more options, visit https://groups.google.com/d/optout. > > > > > -- > You received this message because you are subscribed to a topic in the > Google Groups "open-iscsi" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/open-iscsi/uVZSZV1pz1M/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at https://groups.google.com/group/open-iscsi. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
