I would imagine that it's more likely you ran out of inodes in both cases. "man mke2fs" will talk about the "-i bytes-per-inode" parameter. "df -i" will show you inode usage on each file system.
Mark Post -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Jim Sibley Sent: Friday, March 19, 2004 3:12 PM To: [EMAIL PROTECTED] Subject: Myth of the 1K blocksize on eckd (corrected) Sorry for the finger slip; I do not like MS products! In formatting a 3390 eckd image, it is clearly better to use 4096 than 1024 byte blocks! I formatted two 3390-3 volumes, one with 1K blocks and one with 4K blocks. I then put ext2 filesystems of 1k and 4bk blocks respectively. (SuSE SLES8 SP3) Using files from 0 bytes to 1024 bytes, I could get 1.2GB and 300,947 files on the 4k block but I could only get .812 GB and 206,741 files on the 1k blocks! Since I used from 0 to 1024byte files, all "small", 4k blocks still got more and files on the back. If I had used even bigger files, I would infer that 4k blocks would look even better. Here is a side by side comparison: 1k cdl 4k cdl fmt -b 1024 -b 4096 ext2 -b 1024 -b 4096 blocks 1,626,740 2,366,164 empty 1.6 gb 2.3GB "full" 0.812 GB 1.2 GB files 206,741 300,947 The file systems gave out before all the space was used - each filesystem showed 54% used, but you could not allocate any new files. The difference is space usage is because, with blocks greater than 4096 on a 3390 eckd, more "room" on the disk image is taken up with eckd overhead than data. For blocks gt that about 4096, there is more data on the track than overhead. ===== Jim Sibley RHCT, Implementor of Linux on zSeries "Computer are useless.They can only give answers." Pablo Picasso __________________________________ Do you Yahoo!? Yahoo! Mail - More reliable, more storage, less spam http://mail.yahoo.com ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
