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Nov
9
answered Best practices to prevent 'rm -rf /' in bash scripts
Nov
8
answered Which shared library requires another shared library?
Nov
8
answered How do I find out which application prevents the drive from going to sleep
Nov
7
revised lpfc + multipath + ubuntu - path keeps switching
explain why 4 paths
Nov
6
revised lpfc + multipath + ubuntu - path keeps switching
added 38 characters in body
Nov
6
answered lpfc + multipath + ubuntu - path keeps switching
Nov
1
comment Find out if the OS is running in a virtual environment
Duplicate of serverfault.com/questions/189447/…
Oct
29
comment What is the OSPM Power management feature in current HPC clusters?
@kashyapa: Most clusters run just the stock RHEL kernel. If that kernel supports the ACPI power management system of the hardware, sure, the ondemand governor can be used. But why would we? We run at full load 24/7/365, and there is the concern that switching into sleep states will cause jitter which is poison for tightly synchronized parallel applications.
Oct
28
answered What is the OSPM Power management feature in current HPC clusters?
Oct
27
answered cp from local to usb-drive affects desktop performance
Oct
26
comment Suggestions for recommended file system for Linux server
@Javier: I was specifically thinking about XFS spending quite a lot of IO BW on relogging in many metadata-intensive workloads. FWIW, as of 2.6.35 there is an experimental mount option for addressing this. See e.g. mjmwired.net/kernel/Documentation/filesystems/… . For a practical example, consider rm -rf linux-kernel-source-tree.
Oct
26
comment Suggestions for recommended file system for Linux server
For more anecdotal evidence, I've lost data with ext3, so it's not like it's invincible. So far, no data loss with ext4, although to be fair I've used it much less than ext3.
Oct
26
answered Suggestions for recommended file system for Linux server
Oct
26
answered Linux NFS performance vs other FSs
Oct
26
answered Estimate FLOPS in Linux?
Oct
19
comment Need help debugging: Suspect file server is running slowly because of nfs load
Presumably your NFS server doesn't have a RAID controller with battery backed write cache? Ours has (well, it's a SAN array), and we run ~100 desktops with sync mounted homes with no problems.
Oct
15
answered Linux kernel multiple file system drivers and performance
Oct
15
answered Installing NFS module on a dedicated server
Oct
10
comment Using 4k drives with md/LVM/dm-crypt
@Tom. Many filesystems use a 4 KB block size, so larger sectors would result in a lot of performance-sapping read-modify-writes. Secondly, the drive towards bigger sectors was primarily to increase the ECC efficiency, and there are diminishing returns for making it even bigger.
Oct
10
answered Using 4k drives with md/LVM/dm-crypt