Re: Tiered storage and FATA drives
Marc Van Hoof wrote: The 16K blocksize is an HSM limitation on writing data to a tapedrive. We do have drives (STK 9840C) that can transfer 30 (uncompressed) to 70 Mb/s (compressed). In practice we see HSM putting 500 I/0’s sec / 7,8MB/sec on a drive. Remote over an distance of 40 Km over DWDM it is less 360 I/O’s sec / 5,6MB/sec. 16k is *not* a limitation in HSM. HSM uses DSS under the cover, which uses blocksize up to 64kB. From the other hand maximum transfer depends on compression ratio. However in real life you cannot choose it. -- Radoslaw Skorupka Lodz, Poland -- BRE Bank SA ul. Senatorska 18 00-950 Warszawa www.brebank.pl Sd Rejonowy dla m. st. Warszawy XII Wydzia Gospodarczy Krajowego Rejestru Sdowego, nr rejestru przedsibiorców KRS 025237 NIP: 526-021-50-88 Wedug stanu na dzie 01.01.2008 r. kapita zakadowy BRE Banku SA wynosi 118.642.672 zote i zosta w caoci wpacony. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Tiered storage and FATA drives
The 16K blocksize is an HSM limitation on writing data to a tapedrive. We do have drives (STK 9840C) that can transfer 30 (uncompressed) to 70 Mb/s (compressed). In practice we see HSM putting 500 I/0’s sec / 7,8MB/sec on a drive. Remote over an distance of 40 Km over DWDM it is less 360 I/O’s sec / 5,6MB/sec. -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Tiered storage and FATA drives
Marc, You may want to talk to SUN about using virtualization to host ML1 and ML2 on large capacity SATA drives in rack and stack storage. There's a whitepaper that discusses this here http://www.hds.com/assets/pdf/wp_204_tiered_storage_for_mainframes.pdf. Ron -Original Message- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Marc Van Hoof Sent: Wednesday, October 15, 2008 11:16 AM To: IBM-MAIN@BAMA.UA.EDU Subject: [IBM-MAIN] Tiered storage and FATA drives At my company, we are looking at FATA drives to put our HSM ML1 (1 year period) data on it . Does someone have some experience doeing this ? Today we do not use ML1 and write directly to ML2 , NATIVE tapedrives from SUN/STK. Current drives are fast enough to do the HSM migrate and recall work. But we are running out of slots in the robot and want to replace current tapedrives with new K1000 drives from SUN/STK. This drives can write much more data to tape (capacity drives), but are also slower . We also want to eliminate the native drives for HSM work because HSM can not put enough work on the drives due to its 16K blocksize limitation (IBM has no plans to change this in the nearby future). So ... we are investigating FATA and you ? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Tiered storage and FATA drives
At my company, we are looking at FATA drives to put our HSM ML1 (1 year period) data on it . Does someone have some experience doeing this ? Today we do not use ML1 and write directly to ML2 , NATIVE tapedrives from SUN/STK. Current drives are fast enough to do the HSM migrate and recall work. But we are running out of slots in the robot and want to replace current tapedrives with new K1000 drives from SUN/STK. This drives can write much more data to tape (capacity drives), but are also slower . We also want to eliminate the native drives for HSM work because HSM can not put enough work on the drives due to its 16K blocksize limitation (IBM has no plans to change this in the nearby future). So ... we are investigating FATA and you ? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
Re: Tiered storage and FATA drives
On 15 Oct 2008 11:16:39 -0700, in bit.listserv.ibm-main you wrote: At my company, we are looking at FATA drives to put our HSM ML1 (1 year period) data on it . Does someone have some experience doeing this ? Today we do not use ML1 and write directly to ML2 , NATIVE tapedrives from SUN/STK. Current drives are fast enough to do the HSM migrate and recall work. But we are running out of slots in the robot and want to replace current tapedrives with new K1000 drives from SUN/STK. This drives can write much more data to tape (capacity drives), but are also slower . We also want to eliminate the native drives for HSM work because HSM can not put enough work on the drives due to its 16K blocksize limitation (IBM has no plans to change this in the nearby future). So ... we are investigating FATA and you ? Given that many disk files have block sizes larger than 16K, could you elaborate on what the 16K blocksize limitation is? -- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
